java 绘制长方形_用java画矩形与正方形

package 绘制图形;

//画矩形

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Toolkit;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class rectangle extends JFrame{

public static void main(String args[]) {

JFrame rect = new JFrame("绘制矩形");

JFrame square = new JFrame("绘制正方形");

rect.add(new DrawRectanglePanel());

rect.setVisible(true);

rect.setDefaultCloseOperation(3);

square.add(new DrawSquarePanel());

square.setVisible(true);

square.setDefaultCloseOperation(3);

Toolkit kit = Toolkit.getDefaultToolkit();

Dimension screenSize = kit.getScreenSize();

int width = screenSize.width;

int hight = screenSize.height;

rect.setBounds(width/2, hight/2, 400, 300);

square.setBounds(width/4, hight/4, 400, 300);

}

}

class DrawRectanglePanel extends JPanel{

public void paint(Graphics g) {

//空心矩形的坐标及其长宽

g.drawRect(30, 40, 80, 60);

//实心矩形的坐标及其长宽

g.fillRect(140, 40, 80, 60);

}

}

class DrawSquarePanel extends JPanel{

public void paint(Graphics g) {

//空心正方形

g.drawRect(20, 20, 100, 100);

g.drawRect(40, 40, 60, 60);

//实心加空心正方形

g.drawRect(140, 20, 100, 100);

g.fillRect(160, 40, 60, 60);

}

}

画矩形与方形.png

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