Question

java的actionlistener小问题

import java.io.*;
import java.util.*;
import java.text.*;
import java.lang.*;
import static java.lang.System.*;
import java.util.Set;
import java.util.HashSet;
import javax.swing.*;
import javax.*;
import java.awt.*;
import java.awt.event.*;
public class window
{
public static void main(String args[])throws Exception
{
JFrame W=new JFrame("Window");W.setSize(500,500);W.setVisible(true);//W.setBackground(Color.gray);
JButton Terry=new JButton("Terry");Terry.setSize(100,30);
JButton Hello=new JButton("Hello");Hello.setSize(100,30);
W.add(Terry);W.add(Hello);
Hello.setBounds(50,50,100,30);

ActionListener ear=new ActionListener(){
public void actionPerformed(ActionEvent even)
{
System.out.print(even.getActionCommand());
Terry.enable(false);//就在这，大家帮帮手

}
};
Hello.addActionListener(ear);
Terry.addActionListener(ear);
}
public void act()
{
//this.Hello.enable(false);
}
}

Answer 1

这一行Terry.enable(false);查看API文档就知道，此方法已经过时被取代了，现在要禁用组件用setEnabled()方法。根据这个程序可以改成Terry.setEnabled(false)就可以了！

Answer 2

import java.io.*;
import java.util.*;
import java.text.*;
import java.lang.*;
import static java.lang.System.*;
import java.util.Set;
import java.util.HashSet;
import javax.swing.*;
import javax.*;
import java.awt.*;
import java.awt.event.*;
public class window
{
public static void main(String args[])throws Exception
{
JFrame W=new JFrame("Window");W.setSize(500,500);W.setVisible(true);//W.setBackground(Color.gray);
final JButton Terry=new JButton("Terry");Terry.setSize(100,30);
//注意上一行
JButton Hello=new JButton("Hello");Hello.setSize(100,30);
W.add(Terry);W.add(Hello);
Hello.setBounds(50,50,100,30);

ActionListener ear=new ActionListener(){
public void actionPerformed(ActionEvent even)
{
System.out.print(even.getActionCommand());
Terry.setEnabled(false);//就在这，大家帮帮手

}
};
Hello.addActionListener(ear);
Terry.addActionListener(ear);
}
public void act()
{
//this.Hello.enable(false);
}
}