Java 无法成功获取索引
这是我的密码：Java 无法成功获取索引,java,Java,这是我的密码： import java.util.*; import java.io.*; import java.lang.*; import java.text.*; import javax.swing.*; class SyntaxErrorException extends Exception { public SyntaxErrorException() { super(); } public SyntaxErrorException(St
import java.util.*;
import java.io.*;
import java.lang.*;
import java.text.*;
import javax.swing.*;
class SyntaxErrorException extends Exception {
public SyntaxErrorException() {
super();
}
public SyntaxErrorException(String msg) {
super(msg);
}
}
public class CLI {
private static int loc;
private static boolean first = true;
private static String terminalPrompt = "CLI>";
private static String errorPrompt = "ERR>";
private static String historyPrompt = "HIS>";
private static Vector<String> fnName = new Vector<String>();
private static Vector<String> fnDir = new Vector<String>();
private static String[][] help = {
{
"alert",
"Creat a popup box.",
"alert <string>"
},
{
"echo",
"Print text to console",
"echo <string>"
},
{
"exit",
"Exit console",
"exit"
},
{
"help",
"Get help message",
"help"
},
{
"history",
"Print all input by user",
"history"
},
{
"prompt",
"Change the prompt before the line.",
"prompt <selector> <content>"
},
{
"start",
"Start an application",
"start <appname> [args]"
},
{
"time",
"Print date and time to console",
"time"
},
{
"wait",
"Wait for certein time",
"wait <int>"
},
{
"write",
"Write to file",
"write ( to <string> write/content <string> | from <string> )"
}
};
public static String strJoin(String[] aArr, String sSep) {
StringBuilder sbStr = new StringBuilder();
for (int i = 0, il = aArr.length; i < il; i++) {
if (i > 0)
sbStr.append(sSep);
sbStr.append(aArr[i]);
}
return sbStr.toString();
}
private static String[] defaultArg;
private static Vector<String> history = new Vector<String>();
static void pushErr(String errPrompt, String errMsg) {
System.out.println(errPrompt + " " + errMsg);
}
static void handleCommand(String command, String[] arg){
switch(command.toLowerCase()){
case "alert":
StringJoiner sj = new StringJoiner(" ");
for(String ele : arg){
sj.add(ele);
}
JOptionPane.showMessageDialog(null, sj.toString());
break;
case "echo":
try {
for(String ele : arg){
System.out.print(ele + " ");
}
} catch (Exception ex){}
System.out.println();
break;
case "exit":
System.exit(0);
break;
case "fn":
try {
loc = Arrays.asList(arg).indexOf("fn/location");
if(arg[0] == ""){
break;
}
switch(arg[0]){
case "add":
if(loc <= 1) {
break;
}
if(arg.length < 4) {
break;
}
fnName.add(strJoin(Arrays.copyOfRange(arg, 1, loc), " "));
fnDir.add(strJoin(Arrays.copyOfRange(arg, loc + 1, arg.length), " "));
break;
case "list":
for(int i = 0; i < fnName.size(); i++) {
System.out.println("FUNCTION #" + Integer.toString(i));
System.out.println("Name: \"" + fnName.get(i) + "\"");
System.out.println("Dir: \"" + fnDir.get(i) + "\"");
}
break;
case "run":
int pos = Arrays.asList(fnName).indexOf(strJoin(Arrays.copyOfRange(arg, 1, arg.length), " "));
String ln;
// Doesn't work
if(pos >= 0) {
BufferedReader br = new BufferedReader(new FileReader(fnDir.get(pos)));
while((ln = br.readLine()) != null) {
System.out.println("Line ##");
handleCommand(ln);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
break;
case "help":
for(String[] ele : help) {
System.out.println("Command: " + ele[0]);
System.out.println("Descryption: " + ele[1]);
System.out.println("Syntax: " + ele[2]);
System.out.println();
}
break;
case "history":
for(String ele : history){
System.out.println(historyPrompt + " " + ele);
}
break;
case "prompt":
try {
if(arg[0] == ""){
break;
}
switch(arg[0]) {
case "command":
terminalPrompt = strJoin(Arrays.copyOfRange(arg, 1, arg.length), " ");
break;
case "error":
errorPrompt = strJoin(Arrays.copyOfRange(arg, 1, arg.length), " ");
break;
case "history":
historyPrompt = strJoin(Arrays.copyOfRange(arg, 1, arg.length), " ");
break;
default:
pushErr(errorPrompt, "Wrong selector.");
break;
}
} catch (NullPointerException e) {
pushErr(errorPrompt, "No selector.");
}
break;
case "start":
try {
/* loc = Arrays.asList(arg).indexOf("start/arg");
if(loc < 1){
break;
}
String cmd = strJoin(Arrays.copyOfRange(arg, 0, loc), " ");
String cmdArg = strJoin(Arrays.copyOfRange(arg, loc + 1, arg.length), " ");
Process p = new ProcessBuilder(cmd, cmdArg).start(); */
if (!"cmd".equals(arg[0])) {
Runtime.getRuntime().exec(strJoin(arg, " "));
} else {
Runtime.getRuntime().exec("cmd /c start " + strJoin(arg, " "));
}
} catch (IOException e) {
pushErr(errorPrompt, "IOException Occured.");
}
break;
case "time":
Calendar cal = Calendar.getInstance();
cal.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
System.out.println( sdf.format(cal.getTime()) );
break;
case "wait":
try {
Thread.sleep(Long.parseLong(arg[0]));
} catch (NumberFormatException nfe) {
pushErr(errorPrompt, "Invalid Number!");
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
} catch (NullPointerException npe) {
pushErr(errorPrompt, "Wait time not defined.");
} catch (IllegalArgumentException iae) {
pushErr(errorPrompt, "Invalid Number : Smaller than 0");
}
break;
case "write":
try {
loc = Arrays.asList(arg).indexOf("write/content");
String strln;
switch(arg[0]){
case "to":
if(loc < 1){
System.out.println("No write/content specified.");
break;
}
BufferedWriter bw = new BufferedWriter(new FileWriter(strJoin(Arrays.copyOfRange(arg, 1, loc), " ")));
String[] contentParts = Arrays.copyOfRange(arg, loc + 1, arg.length);
String content = strJoin(contentParts, " ");
bw.write(content);
bw.write("\n");
bw.close();
break;
case "from":
BufferedReader br = new BufferedReader(new FileReader(strJoin(Arrays.copyOfRange(arg, 1, arg.length), " ")));
while((strln = br.readLine()) != null){
System.out.println(strln);
}
br.close();
break;
default:
System.out.println("Write : case not defined.");
}
} catch (FileNotFoundException ex) {
pushErr(errorPrompt, "File (Directory) not found, File name invalid or File writing failed.");
} catch (NullPointerException ex) {
pushErr(errorPrompt, "NullPointerException occured.");
} catch (Exception ex) {
pushErr(errorPrompt, "Unexpected Exception occured. Will terminate app in 2 seconds......");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// Do nothing
}
System.exit(1);
}
break;
case "":
break;
default:
System.out.println("Command '" + command + "' is not available.");
}
}
static void handleCommand(String command){
handleCommand(command, defaultArg);
}
public static void main(String[] args){
try {
Scanner sc = new Scanner(System.in);
String input;
while(true){
if(first == true){
first = false;
}else{
System.out.println();
}
System.out.print(terminalPrompt + " ");
/* Forever loop. Retrieve user input here, and handle it. */
input = sc.nextLine();
history.add(input);
if(input.contains(" ")){
String[] parts = input.split(" ");
handleCommand(parts[0], Arrays.copyOfRange(parts, 1, parts.length));
}else{
handleCommand(input);
}
}
} catch (NoSuchElementException ex) {
System.out.println();
System.out.println("User Pressed CTRL + C : Application Exiting.");
System.exit(0);
}
}
}
command.cliecho This is a function
JavaCLIfn add testFn fn/location command.cli
fn run testFn
CLI> fn add testFn fn/location command.cli
CLI> fn run testFn
This is a function
JOptionPane.showMessageDialog（null，Integer.toString（pos））案例“run”中：-1int pos = Arrays.asList(fnName).indexOf(strJoin(Arrays.copyOfRange(arg, 1, arg.length), " "));
任何帮助都将不胜感激。请在此处添加您的代码。显示您的错误日志，说明找不到字符串？我尝试了此示例，并像OP一样添加了文件，它不会给出任何错误。但它从未成功运行函数。
int pos = Arrays.asList(fnName).indexOf(strJoin(Arrays.copyOfRange(arg, 1, arg.length), " "));