Java 需要帮助修复NullPointerException吗
我是刽子手。当我运行代码时,我得到了几个空指针异常,不知道如何修复 编译错误确切地说是这样的:Java 需要帮助修复NullPointerException吗,java,Java,我是刽子手。当我运行代码时,我得到了几个空指针异常,不知道如何修复 编译错误确切地说是这样的: Exception in thread "main" java.lang.NullPointerException at hangmanrevised.createGame(hangmanrevised.java:66) at hangmanrevised.<init>(hangmanrevised.java:35) at hangmanrevised.main(hangma
Exception in thread "main"
java.lang.NullPointerException at
hangmanrevised.createGame(hangmanrevised.java:66)
at
hangmanrevised.<init>(hangmanrevised.java:35)
at
hangmanrevised.main(hangmanrevised.java:202)
线程“main”中出现异常
位于的java.lang.NullPointerException
创建游戏(HangmanRevied.java:66)
在
HangmanRevied.(HangmanRevied.java:35)
在
main(hangmanrevised.java:202)
感谢您的帮助
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import java.lang.reflect.Array;
import javax.swing.*;
public class hangmanrevised extends JFrame implements ActionListener {
private int wrongs;
private String right;
private StringBuffer guess;
private TextField Letter;
private String message;
private String information;
private JButton button;
private final int hung = 11;
public hangmanrevised() {
setSize(600,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new FlowLayout());
ImageIcon background = new ImageIcon("nightsky.png");
TextField Letter = new TextField();
JLabel label = new JLabel("pick a Letter");
Button button = new Button("Enter");
add(label);
add(button);
add(Letter);
button.addActionListener(this);
createGame();
}
public void createGame(){
wrongs = 0;
String word = "school|java|programming|science|computer";
String[] temp;
String delimiter = "\\|";
temp = word.split(delimiter);
Random randomPicker = new Random();
int randomWord = randomPicker.nextInt(temp.length);
right = new String(temp[randomWord]);
char positions[] = new char[right.length()];
for (int i = 0; i < right.length(); i++) {
positions[i] = '-';
}
String s = new String(positions);
guess = new StringBuffer(s);
Letter.setText("");
message="";
information = "";
repaint();
}
public void paint(Graphics g) {
super.paint(g);
//g.drawImage(background, 0, 156, Color.green, Enter);
int baseY = 350;
g.setColor(Color.lightGray);
g.drawRect(0, baseY,400,baseY);
g.fillRect(0, baseY,400,baseY);
g.setColor(Color.darkGray);
//g.drawRect(250,50,125,50);
//g.fillRect(250,50,125,50);
if (wrongs > 0){
g.drawLine(125,baseY,125,baseY-100);
g.drawLine(123,baseY,123,baseY-100);
}
if (wrongs > 1){
g.drawLine(110,baseY,125,baseY-15);
g.drawLine(108,baseY,122,baseY-15);
}
if (wrongs > 2){
g.drawLine(140,baseY,125,baseY-15);
g.drawLine(138,baseY,122,baseY-15);
}
if (wrongs > 3){
g.drawLine(125,baseY-100,175,baseY-100);
g.drawLine(125,baseY-98,175,baseY-98);
}
if (wrongs > 4){
g.drawLine(175,baseY-100,175,baseY-75);
}
if (wrongs > 5){
g.drawOval(170,baseY-75,10,12);
}
if (wrongs > 6){
g.drawOval(160,baseY-65,15,25);
g.fillOval(160,baseY-65,15,25);
}
if (wrongs > 7){
g.drawLine(150,baseY-65,170,baseY-60);
}
if (wrongs > 8){
g.drawLine(173,baseY-60,193,baseY-65);
}
if (wrongs > 9){
g.drawLine(155,baseY-30,170,baseY-45);
}
if (wrongs > 10){
g.drawLine(173,baseY-45,193,baseY-30);
}
g.drawString( message, 60, baseY+25 );
g.drawString( information, 25, baseY+45 );
g.drawString( new String (guess), 110, 60);
//listener();
}
public void actionPerformed(ActionEvent e){
if (e.getSource() == button){
processTurn();
Letter.setText("");
repaint();
}
}
private void processTurn(){
String s, t;
char a;
s = Letter.getText();
a = s.charAt(0);
if (!Character.isLetter(a)){
message="Letters only";
return;
}
if (s.length()>1){
message="Enter 1 letter only";
return;
}
t = new String(guess);
if (t.indexOf(s) != -1){
JOptionPane.showMessageDialog(null, "LETTER USED ALREADY");
return;
}
if (right.indexOf(s) == -1){
message="";
wrongs++;
if (wrongs == hung){
JOptionPane.showMessageDialog(null, "YOU LOST!");
}
return;
}
for (int i = 0; i < right.length(); i++){
if (right.charAt(i) == a){
guess.setCharAt(i, a);
}
}
t = new String(guess);
if (t.indexOf('-') == -1){
JOptionPane.showMessageDialog(null, "YOU WIN!");
message="You win!";
return;
}
message="";
repaint();
}
public static void main(String[] args) {
hangmanrevised f = new hangmanrevised();
f.setVisible(true);
}
}
import java.awt.*;
导入java.awt.event.*;
导入java.util.Random;
导入java.lang.reflect.Array;
导入javax.swing.*;
公共类Hangman实现了ActionListener{
私人恩怨;
私有字符串权;
私有字符串缓冲区猜测;
私人TextField信件;
私有字符串消息;
私有字符串信息;
私人按钮;
私人最终总积分=11;
公共绞刑{
设置大小(600400);
setLocationRelativeTo(空);
setDefaultCloseOperation(关闭时退出);
setLayout(新的FlowLayout());
ImageIcon background=新的ImageIcon(“nightsky.png”);
TextField字母=新的TextField();
JLabel标签=新JLabel(“选择字母”);
按钮按钮=新按钮(“输入”);
添加(标签);
添加(按钮);
加(信);
addActionListener(这个);
createGame();
}
公共游戏(){
错误=0;
String word=“学校| java |编程|科学|计算机”;
字符串[]温度;
字符串分隔符=“\\\\;”;
temp=字分割(分隔符);
随机选取器=新随机();
int randomWord=randomPicker.nextInt(临时长度);
右=新字符串(临时[randomWord]);
字符位置[]=新字符[right.length()];
for(int i=0;i0){
g、 抽绳(125,baseY,125,baseY-100);
g、 抽绳(123,baseY,123,baseY-100);
}
如果(错误>1){
g、 抽绳(110,baseY,125,baseY-15);
g、 抽绳(108,baseY,122,baseY-15);
}
如果(错误>2){
g、 抽绳(140,baseY,125,baseY-15);
g、 抽绳(138,baseY,122,baseY-15);
}
如果(错误>3){
g、 抽绳(125,baseY-100175,baseY-100);
g、 抽绳(125,baseY-98175,baseY-98);
}
如果(错误>4){
g、 抽绳(175,baseY-100175,baseY-75);
}
如果(错误>5){
g、 drawOval(170,baseY-75,10,12);
}
如果(错误>6){
g、 drawOval(160,baseY-65,15,25);
g、 圆形(160,baseY-65,15,25);
}
如果(错误>7){
g、 抽绳(150,baseY-65170,baseY-60);
}
如果(错误>8){
g、 抽绳(173,baseY-60193,baseY-65);
}
如果(错误>9){
g、 抽绳(155,baseY-30170,baseY-45);
}
如果(错误>10){
g、 抽绳(173,baseY-45193,baseY-30);
}
g、 抽绳(消息,60,baseY+25);
g、 抽绳(信息,25,baseY+45);
g、 抽绳(新绳(猜测),110,60);
//监听器();
}
已执行的公共无效操作(操作事件e){
如果(例如getSource()==按钮){
processTurn();
字母.setText(“”);
重新油漆();
}
}
私有void processTurn(){
字符串s,t;
字符a;
s=Letter.getText();
a=s.charAt(0);
if(!Character.isleter(a)){
message=“仅限信函”;
返回;
}
如果(s.长度()>1){
message=“仅输入1个字母”;
返回;
}
t=新字符串(猜测);
如果(t.indexOf(s)!=-1){
showMessageDialog(null,“已使用的字母”);
返回;
}
if(右索引of)=-1){
message=“”;
错误++;
如果(错误==挂起){
showMessageDialog(null,“您丢失了!”);
}
返回;
}
for(int i=0;i
尝试只使用“|”作为分隔符看看巴卢斯的评论。能够以简单的形式解决问题并运行调试器是很重要的 在构造函数中,您意外地将
newtextfield()
赋值给局部变量而不是字段
改变
TextField Letter = new TextField();
到
顺便说一句,我强烈建议您以小写开头变量,以大写开头类名,即
而不是字母
和字母
代替HangmanRevised
HangmanRevised
Letter = new TextField();