2.1聊天界面

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import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class MyButton{

public static void main(String[] args){

JFrame w = new JFrame();

w.setSize(300, 400);

MyPanel mp = new MyPanel();

w.add(mp);

w.addMouseListener(mp);

mp.addMouseListener(mp);

w.setVisible(true);

}

}

class MyPanel extends JPanel implements MouseListener{

boolean b = true;

public void paint(Graphics g){

super.paint(g);

if(b){

g.setColor(Color.WHITE);

g.drawLine(30, 30, 80, 30);

g.drawLine(30, 30, 30, 50);

g.setColor(Color.BLACK);

g.drawLine(30, 50, 80, 50);

g.drawLine(80, 30, 80, 50);

}else{

g.setColor(Color.BLACK);

g.drawLine(30, 30, 80, 30);

g.drawLine(30, 30, 30, 50);

g.setColor(Color.WHITE);

g.drawLine(30, 50, 80, 50);

g.drawLine(80, 30, 80, 50);

}

}

@Override

public void mouseClicked(MouseEvent arg0){

}

@Override

public void mouseEntered(MouseEvent arg0){

}

@Override

public void mouseExited(MouseEvent arg0){

}

@Override

public void mousePressed(MouseEvent arg0){

if(arg0.getX()>30 && arg0.getX()<80&&

arg0.getY()>30 && arg0.getY()<50)

{

b = false;

repaint();

}

}

@Override

public void mouseReleased(MouseEvent arg0){

b = true;

repaint();

}

}

import java.awt.*;

import javax.swing.*;

public class MyButton{

public static void main(String[] args){

JFrame w = new JFrame();

w.setSize(300, 400);

JButton b1 = new JButton("OK1");

JButton b2 = new JButton("OK2");

JButton b3 = new JButton("OK3");

JButton b4 = new JButton("OK4");

JButton b5 = new JButton("OK5");

//设置布局

w.setLayout(new BorderLayout());

w.add(b1, BorderLayout.NORTH);

w.add(b2, BorderLayout.SOUTH);

w.add(b3, BorderLayout.WEST);

w.add(b4, BorderLayout.EAST);

w.add(b5, BorderLayout.CENTER);

w.setVisible(true);

}

}

//设置布局

w.setLayout(new GridLayout(3, 2));

//设置布局

w.setLayout(new FlowLayout());