事件监听

[csupanmin]

我在写关于时间监听的小程序，但是不知道为什么只能显示一种颜色，不能换颜色，代码如下：
package com.panmin.ActionDemo;

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

public class ButtonTest {

public static void main(String[] args) {

ButtonFrame frame = new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}

}


class ButtonFrame extends JFrame {
public ButtonFrame(){
setTitle("事件监听");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

ButtonPanel panel = new ButtonPanel();
add(panel);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 300;

}


class ButtonPanel extends JPanel {
public ButtonPanel(){
JButton redButton = new JButton("RED");
JButton yellowButton = new JButton("YELLO");
JButton blueButton = new JButton("BLUE");

add(redButton);
add(yellowButton);
add(blueButton);


ColorAction yellow = new ColorAction(Color.YELLOW);
ColorAction red = new ColorAction(Color.RED);
ColorAction blue = new ColorAction(Color.BLUE);

redButton.addActionListener(red);
yellowButton.addActionListener(yellow);
blueButton.addActionListener(blue);

}

private class ColorAction implements ActionListener {
public ColorAction( Color c){
color = c;
}
public void actionPerformed(ActionEvent e) {

setBackground(color);
}
}
private Color color;
}

[wd9053]

[Quote=引用楼主 csupanmin 的回复:]
setBackground(color);
}
}
private Color color;
}
[/Quote]
color放在ButtonFrame里面了，结果最后被赋值为Color.BLUE
应该为
setBackground(color);
}
private Color color;
}
}
注意缩进。。

[欢乐极客]

package com.xiaoyong;

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

public class ButtonTest {

	public static void main(String[] args) {

		ButtonFrame frame = new ButtonFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

}

@SuppressWarnings("serial")
class ButtonFrame extends JFrame {
	public ButtonFrame() {
		setTitle("事件监听");
		setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

		ButtonPanel panel = new ButtonPanel();
		add(panel);
	}

	public static final int DEFAULT_WIDTH = 300;
	public static final int DEFAULT_HEIGHT = 300;

}

@SuppressWarnings("serial")
class ButtonPanel extends JPanel {
	public ButtonPanel() {
		JButton redButton = new JButton("RED");
		JButton yellowButton = new JButton("YELLO");
		JButton blueButton = new JButton("BLUE");

		add(redButton);
		add(yellowButton);
		add(blueButton);

		ColorAction yellow = new ColorAction(Color.YELLOW);
		ColorAction red = new ColorAction(Color.RED);
		ColorAction blue = new ColorAction(Color.BLUE);

		redButton.addActionListener(red);
		yellowButton.addActionListener(yellow);
		blueButton.addActionListener(blue);

	}

	private class ColorAction implements ActionListener {
		private Color color;

		public ColorAction(Color c) {
			color = c;
		}

		public void actionPerformed(ActionEvent e) {

			setBackground(color);
		}
	}
}

这样就没问题了...


PS:LZ发帖的时候注意，将java代码写入[ code=Java ][ /code ]中进行格式化显示

[欢乐极客]

将[ code=java][ /code]中的第一个空格去掉。

[dabanphoto]

格式很重要呀楼主。

[shrekting777]

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

public class ButtonTest {

	public static void main(String[] args) {

		ButtonFrame frame = new ButtonFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}//

}//class


@SuppressWarnings("serial")
class ButtonFrame extends JFrame {
	public ButtonFrame(){
		setTitle("事件监听");
		setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

		ButtonPanel panel = new ButtonPanel();
		add(panel);
	}//
	public static final int DEFAULT_WIDTH = 300;
	public static final int DEFAULT_HEIGHT = 300;

}//class


@SuppressWarnings("serial")
class ButtonPanel extends JPanel {
	public ButtonPanel(){
		JButton redButton = new JButton("RED");
		JButton yellowButton = new JButton("YELLO");
		JButton blueButton = new JButton("BLUE");

		add(redButton);
		add(yellowButton);
		add(blueButton);


		ColorAction yellow = new ColorAction(Color.YELLOW);
		ColorAction red = new ColorAction(Color.RED);
		ColorAction blue = new ColorAction(Color.BLUE);

		redButton.addActionListener(red);
		yellowButton.addActionListener(yellow);
		blueButton.addActionListener(blue);

	}//

	private class ColorAction implements ActionListener {
		public ColorAction( Color c){
			color = c;
		}
		public void actionPerformed(ActionEvent e) {

			setBackground(color);
		}
		private Color color;
	}//
	
	
	
}//class

private Color color;
写在了class ColorAction类的外面

[superzhaohailiang]

[Quote=引用 1 楼 wd9053 的回复:]
引用楼主 csupanmin 的回复:
setBackground(color);
}
}
private Color color;
}

color放在ButtonFrame里面了，结果最后被赋值为Color.BLUE
应该为
setBackground(color);
}
private Color color;
}
}
注意缩进。。
[/Quote]
格式很重要哦！！

[csupanmin]

各位大虾，格式我知道，只是在发帖的时候我是复制粘贴的，所以格式有点乱，谢谢各位大虾的帮助，在后来运行的时候我就发现错误了，只是一是蒙了