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);
}
}
--------------------Configuration: <Default>--------------------
C:\window.java:26: 从内部类中访问局部变量 Terry；需要被声明为最终类型
Terry.setEnabled(false);

Answer 1

Terry.enable(false);写错了Terry.setEnabled(false);你可以在这里两个按扭都用一个ActionListener

ActionListener listener = new ActionListener(){
public void actionPerformed(ActionEvent even) {
String str = e.getActionCommand();
if(str.equals("Terry")){
Terry.setEnabled(false);
}
if(str.equals(""Hello)){
Hello.setEnabled(false);
}
}
};
顺便说下，java定义对象的时候第一个字母一般不大写的 Terry 应该为terry

Answer 2

ActionListener ear=new ActionListener(){
public void actionPerformed(ActionEvent even)
{
System.out.print(even.getActionCommand());
Terry.setEnable(false);//就在这，楼主你写错了

}
}; 以后直接用ide那种自动弹出方法的那种方法写方法,这样错误就会少多了.

Answer 3

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);
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);
}
}