randcolorbackground.java

输出改变屏幕颜色的程序和读取一列数并且对它进行排序

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

public class RandColorBackground extends JxFrame implements ActionListener {

	private JButton Change;
	private Color color;
	private JPanel jp;

	public RandColorBackground() {
		super("随机改变背景颜色");
		color = Color.yellow;
		setGUI();
	}

	private void setGUI() {
		jp = new JPanel();
		getContentPane().add(jp);

		Change = new JButton("改变颜色");
		Change.addActionListener(this);

		jp.add(Change);
		setSize(new Dimension(250, 100));
		setVisible(true);
	}

	public void actionPerformed(ActionEvent e) {
		Object obj = e.getSource();
		if (obj == Change)
			switchcolors();
	}

	private void switchcolors() {
		// 颜色中的RGB和Alpha通道的值的范围为0-255
		int Max = 255;
		int Min = 0;

		// 随机赋值
		int R = Min + (int) ((Max - Min) * Math.random());
		int G = Min + (int) ((Max - Min) * Math.random());
		int B = Min + (int) ((Max - Min) * Math.random());
		int A = Min + (int) ((Max - Min) * Math.random());

		// 在控制台输出值
		System.out.println("Color Changed: ");
		System.out.println("R = " + R);
		System.out.println("G = " + G);
		System.out.println("B = " + B);
		System.out.println("A = " + A);

		// 利用RGBA产生新的颜色
		color = new Color(R, G, B, A);
		jp.setBackground(color);
		repaint();
	}

	public static void main(String[] args) {
		new RandColorBackground();
	}

}