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ButtonFram.java
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79 lines (69 loc) · 2.07 KB
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package Chapter8Event;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
/*
* 用内部类组织事件监听
*
* */
public class ButtonFram extends JFrame{
private static int DEFAULT_WIDTH=300;
private static int DEFAULT_HEIGHT=200;
private JPanel buttonPanel;
public static void main(String[] args) {
new ButtonFram();
}
public ButtonFram(){
setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
/*//新建监听器
ActionListener listenerBlack=new colorAction(Color.BLACK);
ActionListener listenerYellow=new colorAction(Color.yellow);
ActionListener listenerBlue=new colorAction(Color.blue);
//实例化几个按钮
JButton buttonBlack=new JButton("Black");
JButton buttonYellow=new JButton("Yellow");
JButton buttonBlue=new JButton("Blue");
//为按钮添加监听
buttonBlack.addActionListener(listenerBlack);
buttonYellow.addActionListener(listenerYellow);
buttonBlue.addActionListener(listenerBlue);
//创建按钮面板，并将按钮加入面板上
buttonPanel=new JPanel();
buttonPanel.add(buttonBlue);
buttonPanel.add(buttonYellow);
buttonPanel.add(buttonBlack);
//将面板添加到Fram框架上
this.add(buttonPanel);*/
buttonPanel=new JPanel();
setButton("Black",Color.BLACK);
setButton("Yellow",Color.yellow);
setButton("Blue",Color.blue);
this.add(buttonPanel);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//color要声明为final,不需要显示的声明构造器，内部类机制会自动生成一个构造器
public void setButton(String name,final Color bc){
JButton button=new JButton(name);
//匿名内部类
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
buttonPanel.setBackground(bc);
}
});
buttonPanel.add(button);
}
/*//用内部类组织
private class colorAction implements ActionListener{
private Color pannelColor;
public colorAction(Color color){
this.pannelColor=color;
}
public void actionPerformed(ActionEvent e) {
buttonPanel.setBackground(pannelColor);
}
}*/
}