ActionListener和event.getSource（）

Question

我在Java代码中存在一个常量问题。 每当我尝试在我的程序上使用我的按钮他们不工作，我认为问题是在event.getSource（），但我找不到它。 这里是我的完整代码：

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.event.*; 

public class Safe extends JFrame implements ActionListener{ 
    private JButton b1, b2, b3; 
    private JTextField display; 
    private JLabel displayLabel; 
    private int[] pass = new int[5]; 
    private int hits = 0; 

    public static void main(String[] args){ 
     Safe frame = new Safe(); 
     frame.setSize(250, 100); 
     frame.createGUI(); 
     frame.setVisible(true); 
    } 

    private void createGUI(){ 
     setDefaultCloseOperation(EXIT_ON_CLOSE); 
     Container window = getContentPane(); 
     window.setLayout(new FlowLayout()); 

     b1 = new JButton("1"); 
     window.add(b1); 
     b1.addActionListener(this); 

     b2 = new JButton("2"); 
     window.add(b2); 
     b2.addActionListener(this); 

     b3 = new JButton("3"); 
     window.add(b3); 
     b3.addActionListener(this); 

     displayLabel = new JLabel("Enter 6 digit combination:"); 
     window.add(displayLabel); 

     display = new JTextField(6); 
     window.add(display); 
    } 

    public void actionPerformed(ActionEvent event){ 
     int i; 
     int[] user = new int[5]; 
     if(hits == 0){ 
      pass[0] = 1; 
      pass[1] = 1; 
      pass[2] = 1; 
      pass[3] = 1; 
      pass[4] = 1; 
      pass[5] = 2; 
     } 
     for(i=0;i<5;i++){ 
      if(event.getSource() == b1){ 
       display.setText("1"); 
       user[i] = 1; 
      } 
      else if(event.getSource() == b2){ 
       display.setText("2"); 
       user[i] = 2; 
      } 
      else if(event.getSource() == b3){ 
       display.setText("3"); 
       user[i] = 3; 
      } 
     } 
     i = -1; 
     do{ 
      i++; 
      if(pass[i] != user[i]){ 
       JOptionPane.showMessageDialog(null,"Incorrect Code! Try Again!"); 
      } 

      if(i == 5){ 
       JOptionPane.showMessageDialog(null,"Correct Code!"); 
      } 
     }while(pass[i] == user[i]); 
    } 
} 

错误接收

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 5 
at Safe.actionPerformed(Safe.java:53) 
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) 
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) 
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) 

Answer 1

int[] user = new int[5]; 
... 
//pass[5] = 2; 

Arrary索引是基于0的，所以指数5真的是不存在的第6项。所以摆脱这种说法。