可能不合你的原意

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class twoPanelFrame extends JFrame implements MouseListener

{

JPanel smallpanel=new JPanel();

Container contentpane;

int x=0;

int y=0;

public twoPanelFrame() {

contentpane=this.getContentPane();

contentpane.setLayout(null);

setSize(400,300);

JPanel panel1=new JPanel();

panel1.setLayout(null);

JPanel panel2=new JPanel();

smallpanel.setBackground(Color.black);

contentpane.add(smallpanel);

smallpanel.addMouseListener(this);

JSplitPane wholePane= new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,

panel1, panel2);

smallpanel.setBounds(0,0,50,50);

contentpane.add(wholePane);

wholePane.setBounds(0,0,400,300);

contentpane.setVisible(true);

contentpane.validate();

this.setVisible(true);

}

public void mousePressed(MouseEvent m)

{

x = m.getX();

y = m.getY();

smallpanel.setLocation(x,y);

smallpanel.setVisible(false);

smallpanel.setBackground(Color.blue);

validate();

}

public void mouseReleased(MouseEvent m)

{

x = m.getX();

y = m.getY();

smallpanel.setLocation(x, y);

smallpanel.setVisible(true);

smallpanel.setBackground(Color.yellow);

validate();

}

public void mouseEntered(MouseEvent m) {

smallpanel.setVisible(true);

validate();

}

public void mouseExited(MouseEvent m) {}

public void mouseClicked(MouseEvent m) {}

}

public class twoPanel

{

public static void main(String[] args)

{

twoPanelFrame frame = new twoPanelFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.show();

}

}

總結

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