是时候展现大神的技术了。。

帮顶

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Hope
{
    public static void main(String args[])
    {
        new LDFrame();
    }
}
class LDFrame extends JFrame
{
    JTabbedPane jtp;
    JPanel jp1,jp2,jp3;
    LDFrame()
        {
        this.setSize(500,500);
        this.setTitle("暑假任务.");
        jp1=new JPanel();
        jp1.setBackground(Color.GREEN);
        jp2=new JPanel();
        jp2.setBackground(Color.BLUE);
        jp3=new JPanel();
        jp3.setBackground(Color.WHITE);
        jtp=new JTabbedPane();
        jtp.add("绿色",jp1);
        jtp.add("蓝色",jp2);
        jtp.add("白色",jp3);
        this.add(jtp,BorderLayout.CENTER);
        this.setLocationRelativeTo(null);
        this.setVisible(true);
        }

}

用盒布局加流布局，监听事件单独处理，最好再单独定义javabean，排版效果处理恰当