在尝试编译Netbeans中的'猜数字'程序时，程序似乎继续运行但程序没有执行。当用户点击“播放”JButton时，playGame方法应该运行，但似乎没有任何事情发生，也没有抛出任何异常。
代码如下。 谢谢 夏兰
/*
* chpter 11 GUI programmong questions
* 11.15
*/
package Chapter11GUI;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.ActiveEvent;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.ImageIcon;
import javax.swing.Icon;
import javax.swing.SwingConstants;
import java.util.Random;
public class GuessGame extends JFrame {
//instance varibles/files
private JLabel intro;
private JLabel highorlow;
private JButton play;
private JTextField enterAnswer;
private int answer1;
private int answer2;
private ImageIcon icon1;
private ImageIcon icon2;
private JPanel panel;
private Random numberGenerator;
private int correctAnswer;
//constructor willll create GUI o a JFrame and register event handlers
public GuessGame() {
super("GuessGAme");
setLayout(new BorderLayout());
Icon icon1 = new ImageIcon(getClass().getResource("bug1.gif"));
Icon icon2 = new ImageIcon(getClass().getResource("travelbug.gif"));
//JtextField to get user input
enterAnswer = new JTextField(5);
//enterAnswer.addActionListener(handler);
enterAnswer.setText("Guess");
enterAnswer.setEditable(false);
//JLabel to display heading
intro = new JLabel("Press Play to begin....", icon1, SwingConstants.CENTER);
highorlow = new JLabel();
//place componments on a panel useing flowlayout manager to hold text aea only
panel = new JPanel();
panel.add(enterAnswer);
panel.add(highorlow);
//JButton to play again and use anoumonus class to call gameMethod
play = new JButton("Play");
add(panel, BorderLayout.CENTER);
add(intro, BorderLayout.NORTH);
add(play, BorderLayout.SOUTH);
play.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//if button clicked then setart game
play.setText("Enjoy");
playGame();
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}//end actionPerfomred
});//end annmous class ActionListener call from addAcionlistener method
}//end construtor
//a method to play the game
public void playGame() {
//generate randown number bewteen 1 and 100
numberGenerator = new Random();
correctAnswer = numberGenerator.nextInt(100);
panel.setBackground(Color.magenta);
answer1 = 0;
answer2 = 0;
enterAnswer.setEditable(true);
enterAnswer.setText("");
while ((answer1 != correctAnswer) && (answer2 != correctAnswer)) {
intro.setText("I have a number bewteen 1 and a 100."
+ "Can you guess my number?");
enterAnswer.setEditable(true);
enterAnswer.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == enterAnswer) {
answer1 = Integer.parseInt(enterAnswer.getText());
}
//set background as red as it is first guess
panel.setBackground(Color.red);
//noe set wether too high or two low
if (answer1 > correctAnswer) {
highorlow.setText("Guess Too High");
highorlow.setIcon(icon2);
} else if (answer1 < correctAnswer) {
highorlow.setText("You are gussing too low");
highorlow.setIcon(icon2);
}//end esle if statement
}//end actionPerfomred
});//end ActionListener
//get answer number 2
intro.setText("Try Again...");
enterAnswer.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == enterAnswer) {
answer2 = Integer.parseInt(enterAnswer.getText());
}
//check if gettingb hot or cold
//2nd answer is closer than first so turn red
if ((Math.abs(answer2 - correctAnswer)) > (Math.abs(answer2 - correctAnswer))) {
panel.setBackground(Color.red);
} else {
panel.setBackground(Color.BLUE);
}
//now add too hihg ot tewo low
//noe set wether too high or two low
if (answer2 > correctAnswer) {
highorlow.setText("Guess Too High");
highorlow.setIcon(icon2);
} else if (answer2 < correctAnswer) {
highorlow.setText("You are gussing too low");
highorlow.setIcon(icon2);
}//end esle if statement
}//end actionPerformed
});//end ActionLIstener
}//end while loop when answer is correct
//what to do if answer is correct
panel.setBackground(Color.orange);
enterAnswer.setText("Correct!!");
enterAnswer.setEditable(false);
play.setText("PLay Again?");
}//end method playGame
}//end class
/*
*chapter 11
* porgramming question 11.14
*/
package Chapter11GUI;
import javax.swing.JFrame;
public class GuessGameTest {
public static void main(String[] args) {
// instanistae frame form GuessGAme
GuessGame frame = new GuessGame();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(350, 350);
}//end main
}//end clas test
感谢。已删除while循环，程序现在正在运行，但不是我想要的。要解决我正在使用netbeans调试器的问题，我遇到的问题是我似乎无法进入playGame（）方法来查看到底出了什么问题。尝试在与JButton关联的匿名ActionListener内部类中使用步骤（F7）来访问playGame（），并且我已将光标指向playGame的开头，然后指向Run To Cursor命令。在这两个实例中，调试器都返回到测试应用程序主类。希望有意义......
尝试在playGame（）处插入断点但无法访问。这可能与playGame（）方法有关，而不是java主类的一部分吗？当有关的类被实例化时，我似乎只能从主类访问类的构造函数.....
答案 0 :(得分：3)
您的程序实际上是正在编译，实际上似乎也在运行，但看起来您正在使用while (true)循环来绑定Swing事件线程。
public void playGame() {
//generate randown number bewteen 1 and 100
numberGenerator = new Random();
// .... etc...
// ***** this will lock your GUI!! *******
while ((answer1 != correctAnswer) && (answer2 != correctAnswer)) {
intro.setText("I have a number bewteen 1 and a 100."
+ "Can you guess my number?");
// ....
}
}//end method playGame
执行此操作时，while循环将继续在Swing事件线程（或事件分派线程或edt）上运行，从而阻止edt与用户交互。这将导致程序完全无响应。
解决方案，不要这样做。使用事件驱动的编程代码而不是项目的线性控制台程序代码。让您的程序根据answer1和answer2字段的状态更改其行为，但不要在while循环中执行此操作。换句话说，ActionListener的actionPerformed方法的行为会有所不同，具体取决于这些和其他类字段的状态。 Swing事件循环将是您需要的所有游戏循环。
答案 1 :(得分：0)
好的，通过调试器中的GUI快照访问JButton actionListener匿名类的方法。
再次感谢您的帮助。 ç