使用Antlr4时出现100个Java编译错误

我刚开始使用ANTLR4，在编译过程中遇到了一些问题（使用Ubuntu）。 我使用以下语法“Expr”：

当我运行命令“antlr4 Expr.g4”时。。没有错误。。 但是，当我尝试使用“javac Expr*.java”编译时，我得到了100个错误的列表：

ExprBaseListener.java:3: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.ParserRuleContext;
                           ^
ExprBaseListener.java:4: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.ErrorNode;
                                ^
ExprBaseListener.java:5: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.TerminalNode;
                                ^
ExprListener.java:2: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.ParseTreeListener;
                                ^
ExprListener.java:8: error: cannot find symbol
public interface ExprListener extends ParseTreeListener {
                                      ^
  symbol: class ParseTreeListener
ExprParser.java:3: error: package org.antlr.v4.runtime.dfa does not exist
import org.antlr.v4.runtime.dfa.DFA;
                               ^
ExprParser.java:12: error: cannot find symbol
public class ExprParser extends Parser {
                                ^
  symbol: class Parser
ExprParser.java:90: error: cannot find symbol
    public static class ProgContext extends ParserRuleContext {
                                            ^
  symbol:   class ParserRuleContext
  location: class ExprParser
ExprParser.java:151: error: cannot find symbol
    public static class ExprContext extends ParserRuleContext {
                                            ^
  symbol:   class ParserRuleContext
  location: class ExprParser
ExprBaseListener.java:43: error: cannot find symbol
    @Override public void enterEveryRule(ParserRuleContext ctx) { }
                                         ^
  symbol:   class ParserRuleContext
  location: class ExprBaseListener
ExprBaseListener.java:49: error: cannot find symbol
    @Override public void exitEveryRule(ParserRuleContext ctx) { }
                                        ^
  symbol:   class ParserRuleContext
  location: class ExprBaseListener
ExprBaseListener.java:55: error: cannot find symbol
    @Override public void visitTerminal(TerminalNode node) { }
                                        ^
  symbol:   class TerminalNode
  location: class ExprBaseListener
ExprBaseListener.java:61: error: cannot find symbol
    @Override public void visitErrorNode(ErrorNode node) { }
                                         ^
  symbol:   class ErrorNode
  location: class ExprBaseListener
ExprParser.java:152: error: cannot find symbol
        public TerminalNode INT() { return getToken(ExprParser.INT, 0); }
               ^
  symbol:   class TerminalNode
  location: class ExprContext
ExprParser.java:159: error: cannot find symbol
        public ExprContext(ParserRuleContext parent, int invokingState) {
                           ^
  symbol:   class ParserRuleContext
  location: class ExprContext
ExprParser.java:164: error: cannot find symbol
        public void enterRule(ParseTreeListener listener) {
                              ^
  symbol:   class ParseTreeListener
  location: class ExprContext
ExprParser.java:168: error: cannot find symbol
        public void exitRule(ParseTreeListener listener) {
                             ^
  symbol:   class ParseTreeListener
  location: class ExprContext
ExprParser.java:97: error: cannot find symbol
        public List<TerminalNode> NEWLINE() { return getTokens(ExprParser.NEWLINE); }
                    ^
  symbol:   class TerminalNode
  location: class ProgContext
ExprParser.java:98: error: cannot find symbol
        public TerminalNode NEWLINE(int i) {
               ^
  symbol:   class TerminalNode
  location: class ProgContext
ExprParser.java:101: error: cannot find symbol
        public ProgContext(ParserRuleContext parent, int invokingState) {
                           ^
  symbol:   class ParserRuleContext
  location: class ProgContext
ExprParser.java:106: error: cannot find symbol
        public void enterRule(ParseTreeListener listener) {
                              ^
  symbol:   class ParseTreeListener
  location: class ProgContext
ExprParser.java:110: error: cannot find symbol
        public void exitRule(ParseTreeListener listener) {
                             ^
  symbol:   class ParseTreeListener
  location: class ProgContext
ExprParser.java:15: error: cannot find symbol
    protected static final DFA[] _decisionToDFA;
                           ^
  symbol:   class DFA
  location: class ExprParser
ExprParser.java:16: error: cannot find symbol
    protected static final PredictionContextCache _sharedContextCache =
                           ^
  symbol:   class PredictionContextCache
  location: class ExprParser
ExprParser.java:41: error: cannot find symbol
    public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
                        ^
  symbol:   class Vocabulary
  location: class ExprParser
ExprParser.java:70: error: cannot find symbol
    public Vocabulary getVocabulary() {
           ^
  symbol:   class Vocabulary
  location: class ExprParser
ExprParser.java:84: error: cannot find symbol
    public ATN getATN() { return _ATN; }
           ^
  symbol:   class ATN
  location: class ExprParser
ExprParser.java:86: error: cannot find symbol
    public ExprParser(TokenStream input) {
                      ^
  symbol:   class TokenStream
  location: class ExprParser
ExprParser.java:115: error: cannot find symbol
    public final ProgContext prog() throws RecognitionException {
                                           ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:173: error: cannot find symbol
    public final ExprContext expr() throws RecognitionException {
                                           ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:177: error: cannot find symbol
    private ExprContext expr(int _p) throws RecognitionException {
                                            ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:283: error: cannot find symbol
    public boolean sempred(RuleContext _localctx, int ruleIndex, int predIndex) {
                           ^
  symbol:   class RuleContext
  location: class ExprParser
ExprParser.java:311: error: cannot find symbol
    public static final ATN _ATN =
                        ^
  symbol:   class ATN
  location: class ExprParser
ExprParser.java:2: error: package org.antlr.v4.runtime.atn does not exist
import org.antlr.v4.runtime.atn.*;
^
ExprParser.java:4: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.*;
^
ExprParser.java:5: error: package org.antlr.v4.runtime.misc does not exist
import org.antlr.v4.runtime.misc.*;
^
ExprParser.java:6: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.*;
^
ExprLexer.java:2: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.Lexer;
                           ^
ExprLexer.java:3: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.CharStream;
                           ^
ExprLexer.java:4: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.Token;
                           ^
ExprLexer.java:5: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.TokenStream;
                           ^
ExprLexer.java:8: error: package org.antlr.v4.runtime.dfa does not exist
import org.antlr.v4.runtime.dfa.DFA;
                               ^
ExprLexer.java:12: error: cannot find symbol
public class ExprLexer extends Lexer {
                               ^
  symbol: class Lexer
ExprLexer.java:15: error: cannot find symbol
    protected static final DFA[] _decisionToDFA;
                           ^
  symbol:   class DFA
  location: class ExprLexer
ExprLexer.java:16: error: cannot find symbol
    protected static final PredictionContextCache _sharedContextCache =
                           ^
  symbol:   class PredictionContextCache
  location: class ExprLexer
ExprLexer.java:47: error: cannot find symbol
    public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
                        ^
  symbol:   class Vocabulary
  location: class ExprLexer
ExprLexer.java:76: error: cannot find symbol
    public Vocabulary getVocabulary() {
           ^
  symbol:   class Vocabulary
  location: class ExprLexer
ExprLexer.java:81: error: cannot find symbol
    public ExprLexer(CharStream input) {
                     ^
  symbol:   class CharStream
  location: class ExprLexer
ExprLexer.java:102: error: cannot find symbol
    public ATN getATN() { return _ATN; }
           ^
  symbol:   class ATN
  location: class ExprLexer
ExprLexer.java:117: error: cannot find symbol
    public static final ATN _ATN =
                        ^
  symbol:   class ATN
  location: class ExprLexer
ExprLexer.java:6: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.*;
^
ExprLexer.java:7: error: package org.antlr.v4.runtime.atn does not exist
import org.antlr.v4.runtime.atn.*;
^
ExprLexer.java:9: error: package org.antlr.v4.runtime.misc does not exist
import org.antlr.v4.runtime.misc.*;
^
ExprBaseListener.java:43: error: method does not override or implement a method from a supertype
    @Override public void enterEveryRule(ParserRuleContext ctx) { }
    ^
ExprBaseListener.java:49: error: method does not override or implement a method from a supertype
    @Override public void exitEveryRule(ParserRuleContext ctx) { }
    ^
ExprBaseListener.java:55: error: method does not override or implement a method from a supertype
    @Override public void visitTerminal(TerminalNode node) { }
    ^
ExprBaseListener.java:61: error: method does not override or implement a method from a supertype
    @Override public void visitErrorNode(ErrorNode node) { }
    ^
ExprParser.java:13: error: cannot find symbol
    static { RuntimeMetaData.checkVersion("4.7.2", RuntimeMetaData.VERSION); }
                                                   ^
  symbol:   variable RuntimeMetaData
  location: class ExprParser
ExprParser.java:13: error: cannot find symbol
    static { RuntimeMetaData.checkVersion("4.7.2", RuntimeMetaData.VERSION); }
             ^
  symbol:   variable RuntimeMetaData
  location: class ExprParser
ExprParser.java:17: error: cannot find symbol
        new PredictionContextCache();
            ^
  symbol:   class PredictionContextCache
  location: class ExprParser
ExprParser.java:41: error: cannot find symbol
    public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
                                                    ^
  symbol:   class VocabularyImpl
  location: class ExprParser
ExprParser.java:62: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:68: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:74: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:77: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:80: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:83: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:88: error: cannot find symbol
        _interp = new ParserATNSimulator(this,_ATN,_decisionToDFA,_sharedContextCache);
        ^
  symbol:   variable _interp
  location: class ExprParser
ExprParser.java:88: error: cannot find symbol
        _interp = new ParserATNSimulator(this,_ATN,_decisionToDFA,_sharedContextCache);
                      ^
  symbol:   class ParserATNSimulator
  location: class ExprParser
ExprParser.java:92: error: cannot find symbol
            return getRuleContexts(ExprContext.class);
                   ^
  symbol:   method getRuleContexts(Class<ExprContext>)
  location: class ProgContext
ExprParser.java:95: error: cannot find symbol
            return getRuleContext(ExprContext.class,i);
                   ^
  symbol:   method getRuleContext(Class<ExprContext>,int)
  location: class ProgContext
ExprParser.java:97: error: cannot find symbol
        public List<TerminalNode> NEWLINE() { return getTokens(ExprParser.NEWLINE); }
                                                     ^
  symbol:   method getTokens(int)
  location: class ProgContext
ExprParser.java:99: error: cannot find symbol
            return getToken(ExprParser.NEWLINE, i);
                   ^
  symbol:   method getToken(int,int)
  location: class ProgContext
ExprParser.java:104: error: method does not override or implement a method from a supertype
        @Override public int getRuleIndex() { return RULE_prog; }
        ^
ExprParser.java:105: error: method does not override or implement a method from a supertype
        @Override
        ^
ExprParser.java:109: error: method does not override or implement a method from a supertype
        @Override
        ^
ExprParser.java:116: error: cannot find symbol
        ProgContext _localctx = new ProgContext(_ctx, getState());
                                                ^
  symbol:   variable _ctx
  location: class ExprParser
ExprParser.java:116: error: cannot find symbol
        ProgContext _localctx = new ProgContext(_ctx, getState());
                                                      ^
  symbol:   method getState()
  location: class ExprParser
ExprParser.java:117: error: cannot find symbol
        enterRule(_localctx, 0, RULE_prog);
        ^
  symbol:   method enterRule(ProgContext,int,int)
  location: class ExprParser
ExprParser.java:120: error: cannot find symbol
            enterOuterAlt(_localctx, 1);
            ^
  symbol:   method enterOuterAlt(ProgContext,int)
  location: class ExprParser
ExprParser.java:122: error: cannot find symbol
            setState(9);
            ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:123: error: cannot find symbol
            _errHandler.sync(this);
            ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:124: error: cannot find symbol
            _la = _input.LA(1);
                  ^
  symbol:   variable _input
  location: class ExprParser
ExprParser.java:128: error: cannot find symbol
                setState(4);
                ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:130: error: cannot find symbol
                setState(5);
                ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:131: error: cannot find symbol
                match(NEWLINE);
                ^
  symbol:   method match(int)
  location: class ExprParser
ExprParser.java:134: error: cannot find symbol
                setState(11);
                ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:135: error: cannot find symbol
                _errHandler.sync(this);
                ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:136: error: cannot find symbol
                _la = _input.LA(1);
                      ^
  symbol:   variable _input
  location: class ExprParser
ExprParser.java:140: error: cannot find symbol
        catch (RecognitionException re) {
               ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:141: error: cannot find symbol
            _localctx.exception = re;
                     ^
  symbol:   variable exception
  location: variable _localctx of type ProgContext
ExprParser.java:142: error: cannot find symbol
            _errHandler.reportError(this, re);
            ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:143: error: cannot find symbol
            _errHandler.recover(this, re);
            ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:146: error: cannot find symbol
            exitRule();
            ^
  symbol:   method exitRule()
  location: class ExprParser
ExprParser.java:152: error: cannot find symbol
        public TerminalNode INT() { return getToken(ExprParser.INT, 0); }
                                           ^
  symbol:   method getToken(int,int)
  location: class ExprContext
ExprParser.java:154: error: cannot find symbol
            return getRuleContexts(ExprContext.class);
                   ^
  symbol:   method getRuleContexts(Class<ExprContext>)
  location: class ExprContext
ExprParser.java:157: error: cannot find symbol
            return getRuleContext(ExprContext.class,i);
                   ^
  symbol:   method getRuleContext(Class<ExprContext>,int)
  location: class ExprContext
ExprParser.java:162: error: method does not override or implement a method from a supertype
        @Override public int getRuleIndex() { return RULE_expr; }
        ^
ExprParser.java:163: error: method does not override or implement a method from a supertype
        @Override
        ^
ExprParser.java:167: error: method does not override or implement a method from a supertype
        @Override
        ^
100 errors

ExprBaseListener.java:3:错误：包org.antlr.v4.runtime不存在
导入org.antlr.v4.runtime.ParserRuleContext；
^
ExprBaseListener.java:4:错误：包org.antlr.v4.runtime.tree不存在
导入org.antlr.v4.runtime.tree.ErrorNode；
^
ExprBaseListener.java:5:错误：包org.antlr.v4.runtime.tree不存在
导入org.antlr.v4.runtime.tree.TerminalNode；
^
java:2:错误：包org.antlr.v4.runtime.tree不存在
导入org.antlr.v4.runtime.tree.ParseTreeListener；
^
java:8:错误：找不到符号
公共接口ExprListener扩展了ParseTreeListener{
^
符号：类ParseTreeListener
java:3:错误：包org.antlr.v4.runtime.dfa不存在
导入org.antlr.v4.runtime.dfa.dfa；
^
java:12:错误：找不到符号
公共类ExprParser扩展解析器{
^
符号：类解析器
java:90:错误：找不到符号
公共静态类ProgContext扩展了ParserRuleContext{
^
符号：类ParserRuleContext
位置：类ExprParser
java:151:错误：找不到符号
公共静态类ExprContext扩展了ParserRuleContext{
^
符号：类ParserRuleContext
位置：类ExprParser
ExprBaseListener.java:43:错误：找不到符号
@重写公共void entereverylule（ParserRuleContext ctx）{}
^
符号：类ParserRuleContext
位置：类ExprBaseListener
ExprBaseListener.java:49:错误：找不到符号
@重写公共void exitEveryRule（ParserRuleContext ctx）{}
^
符号：类ParserRuleContext
位置：类ExprBaseListener
ExprBaseListener.java:55:错误：找不到符号
@重写公共无效VisiterMinal（TerminalNode节点）{}
^
符号：类终端节点
位置：类ExprBaseListener
ExprBaseListener.java:61:错误：找不到符号
@重写公共无效visitErrorNode（ErrorNode节点）{}
^
符号：类错误节点
位置：类ExprBaseListener
java:152:错误：找不到符号
public TerminalNode INT（）{return getToken（ExprParser.INT，0）；}
^
符号：类终端节点
位置：类ExprContext
java:159:错误：找不到符号
public ExprContext（ParserRuleContext父级，int invokingState）{
^
符号：类ParserRuleContext
位置：类ExprContext
java:164:错误：找不到符号
public void enterRule（ParseTreeListener侦听器）{
^
符号：类ParseTreeListener
位置：类ExprContext
java:168:错误：找不到符号
public void exitRule（ParseTreeListener侦听器）{
^
符号：类ParseTreeListener
位置：类ExprContext
java:97:错误：找不到符号
public List NEWLINE（）{return getTokens（ExprParser.NEWLINE）；}
^
符号：类终端节点
位置：类ProgContext
java:98:错误：找不到符号
公共终端节点换行（int i）{
^
符号：类终端节点
位置：类ProgContext
java:101:错误：找不到符号
公共ProgContext（ParserRuleContext父级，int invokingState）{
^
符号：类ParserRuleContext
位置：类ProgContext
java:106:错误：找不到符号
public void enterRule（ParseTreeListener侦听器）{
^
符号：类ParseTreeListener
位置：类ProgContext
java:110:错误：找不到符号
public void exitRule（ParseTreeListener侦听器）{
^
符号：类ParseTreeListener
位置：类ProgContext
java:15:错误：找不到符号
受保护静态最终DFA[]\u决策TODFA；
^
符号：DFA类
位置：类ExprParser
java:16:错误：找不到符号
受保护的静态最终预测ContextCache\u sharedContextCache=
^
符号：类PredictionContextCache
位置：类ExprParser
java:41:错误：找不到符号
公共静态最终词汇表=新词汇表impl（_文字名称，_符号名称）；
^
符号：课堂词汇
位置：类ExprParser
java:70:错误：找不到符号
公共词汇表{
^
符号：课堂词汇
位置：类ExprParser
java:84:错误：找不到符号
公共ATN getATN（）{return\u ATN；}
^
符号：ATN类
位置：类ExprParser
java:86:错误：找不到符号
公共ExprParser（令牌流输入）{
^
符号：类令牌流
位置：类ExprParser
java:115:错误：找不到符号
public final ProgContext prog（）引发识别异常{
^
符号：类识别异常
位置：类ExprParser
java:173:错误：找不到符号
公开期末考试
ExprBaseListener.java:3: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.ParserRuleContext;
                           ^
ExprBaseListener.java:4: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.ErrorNode;
                                ^
ExprBaseListener.java:5: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.TerminalNode;
                                ^
ExprListener.java:2: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.ParseTreeListener;
                                ^
ExprListener.java:8: error: cannot find symbol
public interface ExprListener extends ParseTreeListener {
                                      ^
  symbol: class ParseTreeListener
ExprParser.java:3: error: package org.antlr.v4.runtime.dfa does not exist
import org.antlr.v4.runtime.dfa.DFA;
                               ^
ExprParser.java:12: error: cannot find symbol
public class ExprParser extends Parser {
                                ^
  symbol: class Parser
ExprParser.java:90: error: cannot find symbol
    public static class ProgContext extends ParserRuleContext {
                                            ^
  symbol:   class ParserRuleContext
  location: class ExprParser
ExprParser.java:151: error: cannot find symbol
    public static class ExprContext extends ParserRuleContext {
                                            ^
  symbol:   class ParserRuleContext
  location: class ExprParser
ExprBaseListener.java:43: error: cannot find symbol
    @Override public void enterEveryRule(ParserRuleContext ctx) { }
                                         ^
  symbol:   class ParserRuleContext
  location: class ExprBaseListener
ExprBaseListener.java:49: error: cannot find symbol
    @Override public void exitEveryRule(ParserRuleContext ctx) { }
                                        ^
  symbol:   class ParserRuleContext
  location: class ExprBaseListener
ExprBaseListener.java:55: error: cannot find symbol
    @Override public void visitTerminal(TerminalNode node) { }
                                        ^
  symbol:   class TerminalNode
  location: class ExprBaseListener
ExprBaseListener.java:61: error: cannot find symbol
    @Override public void visitErrorNode(ErrorNode node) { }
                                         ^
  symbol:   class ErrorNode
  location: class ExprBaseListener
ExprParser.java:152: error: cannot find symbol
        public TerminalNode INT() { return getToken(ExprParser.INT, 0); }
               ^
  symbol:   class TerminalNode
  location: class ExprContext
ExprParser.java:159: error: cannot find symbol
        public ExprContext(ParserRuleContext parent, int invokingState) {
                           ^
  symbol:   class ParserRuleContext
  location: class ExprContext
ExprParser.java:164: error: cannot find symbol
        public void enterRule(ParseTreeListener listener) {
                              ^
  symbol:   class ParseTreeListener
  location: class ExprContext
ExprParser.java:168: error: cannot find symbol
        public void exitRule(ParseTreeListener listener) {
                             ^
  symbol:   class ParseTreeListener
  location: class ExprContext
ExprParser.java:97: error: cannot find symbol
        public List<TerminalNode> NEWLINE() { return getTokens(ExprParser.NEWLINE); }
                    ^
  symbol:   class TerminalNode
  location: class ProgContext
ExprParser.java:98: error: cannot find symbol
        public TerminalNode NEWLINE(int i) {
               ^
  symbol:   class TerminalNode
  location: class ProgContext
ExprParser.java:101: error: cannot find symbol
        public ProgContext(ParserRuleContext parent, int invokingState) {
                           ^
  symbol:   class ParserRuleContext
  location: class ProgContext
ExprParser.java:106: error: cannot find symbol
        public void enterRule(ParseTreeListener listener) {
                              ^
  symbol:   class ParseTreeListener
  location: class ProgContext
ExprParser.java:110: error: cannot find symbol
        public void exitRule(ParseTreeListener listener) {
                             ^
  symbol:   class ParseTreeListener
  location: class ProgContext
ExprParser.java:15: error: cannot find symbol
    protected static final DFA[] _decisionToDFA;
                           ^
  symbol:   class DFA
  location: class ExprParser
ExprParser.java:16: error: cannot find symbol
    protected static final PredictionContextCache _sharedContextCache =
                           ^
  symbol:   class PredictionContextCache
  location: class ExprParser
ExprParser.java:41: error: cannot find symbol
    public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
                        ^
  symbol:   class Vocabulary
  location: class ExprParser
ExprParser.java:70: error: cannot find symbol
    public Vocabulary getVocabulary() {
           ^
  symbol:   class Vocabulary
  location: class ExprParser
ExprParser.java:84: error: cannot find symbol
    public ATN getATN() { return _ATN; }
           ^
  symbol:   class ATN
  location: class ExprParser
ExprParser.java:86: error: cannot find symbol
    public ExprParser(TokenStream input) {
                      ^
  symbol:   class TokenStream
  location: class ExprParser
ExprParser.java:115: error: cannot find symbol
    public final ProgContext prog() throws RecognitionException {
                                           ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:173: error: cannot find symbol
    public final ExprContext expr() throws RecognitionException {
                                           ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:177: error: cannot find symbol
    private ExprContext expr(int _p) throws RecognitionException {
                                            ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:283: error: cannot find symbol
    public boolean sempred(RuleContext _localctx, int ruleIndex, int predIndex) {
                           ^
  symbol:   class RuleContext
  location: class ExprParser
ExprParser.java:311: error: cannot find symbol
    public static final ATN _ATN =
                        ^
  symbol:   class ATN
  location: class ExprParser
ExprParser.java:2: error: package org.antlr.v4.runtime.atn does not exist
import org.antlr.v4.runtime.atn.*;
^
ExprParser.java:4: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.*;
^
ExprParser.java:5: error: package org.antlr.v4.runtime.misc does not exist
import org.antlr.v4.runtime.misc.*;
^
ExprParser.java:6: error: package org.antlr.v4.runtime.tree does not exist
import org.antlr.v4.runtime.tree.*;
^
ExprLexer.java:2: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.Lexer;
                           ^
ExprLexer.java:3: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.CharStream;
                           ^
ExprLexer.java:4: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.Token;
                           ^
ExprLexer.java:5: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.TokenStream;
                           ^
ExprLexer.java:8: error: package org.antlr.v4.runtime.dfa does not exist
import org.antlr.v4.runtime.dfa.DFA;
                               ^
ExprLexer.java:12: error: cannot find symbol
public class ExprLexer extends Lexer {
                               ^
  symbol: class Lexer
ExprLexer.java:15: error: cannot find symbol
    protected static final DFA[] _decisionToDFA;
                           ^
  symbol:   class DFA
  location: class ExprLexer
ExprLexer.java:16: error: cannot find symbol
    protected static final PredictionContextCache _sharedContextCache =
                           ^
  symbol:   class PredictionContextCache
  location: class ExprLexer
ExprLexer.java:47: error: cannot find symbol
    public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
                        ^
  symbol:   class Vocabulary
  location: class ExprLexer
ExprLexer.java:76: error: cannot find symbol
    public Vocabulary getVocabulary() {
           ^
  symbol:   class Vocabulary
  location: class ExprLexer
ExprLexer.java:81: error: cannot find symbol
    public ExprLexer(CharStream input) {
                     ^
  symbol:   class CharStream
  location: class ExprLexer
ExprLexer.java:102: error: cannot find symbol
    public ATN getATN() { return _ATN; }
           ^
  symbol:   class ATN
  location: class ExprLexer
ExprLexer.java:117: error: cannot find symbol
    public static final ATN _ATN =
                        ^
  symbol:   class ATN
  location: class ExprLexer
ExprLexer.java:6: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.*;
^
ExprLexer.java:7: error: package org.antlr.v4.runtime.atn does not exist
import org.antlr.v4.runtime.atn.*;
^
ExprLexer.java:9: error: package org.antlr.v4.runtime.misc does not exist
import org.antlr.v4.runtime.misc.*;
^
ExprBaseListener.java:43: error: method does not override or implement a method from a supertype
    @Override public void enterEveryRule(ParserRuleContext ctx) { }
    ^
ExprBaseListener.java:49: error: method does not override or implement a method from a supertype
    @Override public void exitEveryRule(ParserRuleContext ctx) { }
    ^
ExprBaseListener.java:55: error: method does not override or implement a method from a supertype
    @Override public void visitTerminal(TerminalNode node) { }
    ^
ExprBaseListener.java:61: error: method does not override or implement a method from a supertype
    @Override public void visitErrorNode(ErrorNode node) { }
    ^
ExprParser.java:13: error: cannot find symbol
    static { RuntimeMetaData.checkVersion("4.7.2", RuntimeMetaData.VERSION); }
                                                   ^
  symbol:   variable RuntimeMetaData
  location: class ExprParser
ExprParser.java:13: error: cannot find symbol
    static { RuntimeMetaData.checkVersion("4.7.2", RuntimeMetaData.VERSION); }
             ^
  symbol:   variable RuntimeMetaData
  location: class ExprParser
ExprParser.java:17: error: cannot find symbol
        new PredictionContextCache();
            ^
  symbol:   class PredictionContextCache
  location: class ExprParser
ExprParser.java:41: error: cannot find symbol
    public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
                                                    ^
  symbol:   class VocabularyImpl
  location: class ExprParser
ExprParser.java:62: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:68: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:74: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:77: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:80: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:83: error: method does not override or implement a method from a supertype
    @Override
    ^
ExprParser.java:88: error: cannot find symbol
        _interp = new ParserATNSimulator(this,_ATN,_decisionToDFA,_sharedContextCache);
        ^
  symbol:   variable _interp
  location: class ExprParser
ExprParser.java:88: error: cannot find symbol
        _interp = new ParserATNSimulator(this,_ATN,_decisionToDFA,_sharedContextCache);
                      ^
  symbol:   class ParserATNSimulator
  location: class ExprParser
ExprParser.java:92: error: cannot find symbol
            return getRuleContexts(ExprContext.class);
                   ^
  symbol:   method getRuleContexts(Class<ExprContext>)
  location: class ProgContext
ExprParser.java:95: error: cannot find symbol
            return getRuleContext(ExprContext.class,i);
                   ^
  symbol:   method getRuleContext(Class<ExprContext>,int)
  location: class ProgContext
ExprParser.java:97: error: cannot find symbol
        public List<TerminalNode> NEWLINE() { return getTokens(ExprParser.NEWLINE); }
                                                     ^
  symbol:   method getTokens(int)
  location: class ProgContext
ExprParser.java:99: error: cannot find symbol
            return getToken(ExprParser.NEWLINE, i);
                   ^
  symbol:   method getToken(int,int)
  location: class ProgContext
ExprParser.java:104: error: method does not override or implement a method from a supertype
        @Override public int getRuleIndex() { return RULE_prog; }
        ^
ExprParser.java:105: error: method does not override or implement a method from a supertype
        @Override
        ^
ExprParser.java:109: error: method does not override or implement a method from a supertype
        @Override
        ^
ExprParser.java:116: error: cannot find symbol
        ProgContext _localctx = new ProgContext(_ctx, getState());
                                                ^
  symbol:   variable _ctx
  location: class ExprParser
ExprParser.java:116: error: cannot find symbol
        ProgContext _localctx = new ProgContext(_ctx, getState());
                                                      ^
  symbol:   method getState()
  location: class ExprParser
ExprParser.java:117: error: cannot find symbol
        enterRule(_localctx, 0, RULE_prog);
        ^
  symbol:   method enterRule(ProgContext,int,int)
  location: class ExprParser
ExprParser.java:120: error: cannot find symbol
            enterOuterAlt(_localctx, 1);
            ^
  symbol:   method enterOuterAlt(ProgContext,int)
  location: class ExprParser
ExprParser.java:122: error: cannot find symbol
            setState(9);
            ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:123: error: cannot find symbol
            _errHandler.sync(this);
            ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:124: error: cannot find symbol
            _la = _input.LA(1);
                  ^
  symbol:   variable _input
  location: class ExprParser
ExprParser.java:128: error: cannot find symbol
                setState(4);
                ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:130: error: cannot find symbol
                setState(5);
                ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:131: error: cannot find symbol
                match(NEWLINE);
                ^
  symbol:   method match(int)
  location: class ExprParser
ExprParser.java:134: error: cannot find symbol
                setState(11);
                ^
  symbol:   method setState(int)
  location: class ExprParser
ExprParser.java:135: error: cannot find symbol
                _errHandler.sync(this);
                ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:136: error: cannot find symbol
                _la = _input.LA(1);
                      ^
  symbol:   variable _input
  location: class ExprParser
ExprParser.java:140: error: cannot find symbol
        catch (RecognitionException re) {
               ^
  symbol:   class RecognitionException
  location: class ExprParser
ExprParser.java:141: error: cannot find symbol
            _localctx.exception = re;
                     ^
  symbol:   variable exception
  location: variable _localctx of type ProgContext
ExprParser.java:142: error: cannot find symbol
            _errHandler.reportError(this, re);
            ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:143: error: cannot find symbol
            _errHandler.recover(this, re);
            ^
  symbol:   variable _errHandler
  location: class ExprParser
ExprParser.java:146: error: cannot find symbol
            exitRule();
            ^
  symbol:   method exitRule()
  location: class ExprParser
ExprParser.java:152: error: cannot find symbol
        public TerminalNode INT() { return getToken(ExprParser.INT, 0); }
                                           ^
  symbol:   method getToken(int,int)
  location: class ExprContext
ExprParser.java:154: error: cannot find symbol
            return getRuleContexts(ExprContext.class);
                   ^
  symbol:   method getRuleContexts(Class<ExprContext>)
  location: class ExprContext
ExprParser.java:157: error: cannot find symbol
            return getRuleContext(ExprContext.class,i);
                   ^
  symbol:   method getRuleContext(Class<ExprContext>,int)
  location: class ExprContext
ExprParser.java:162: error: method does not override or implement a method from a supertype
        @Override public int getRuleIndex() { return RULE_expr; }
        ^
ExprParser.java:163: error: method does not override or implement a method from a supertype
        @Override
        ^
ExprParser.java:167: error: method does not override or implement a method from a supertype
        @Override
        ^
100 errors