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Java运行矩形代码 java编程实现矩形类

Java编写一个矩形类,并计算面积和周长?

class Rectangle{

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private int width = 2;

private int length = 1;

public int getWidth(){

return this.width;

}

public void setWidth(int w){

this.width = w;

}

public int getLength(){

return this.length;

}

public void setLength(int l){

this.length = l;

}

public int getArea(){

return this.length * this.width;

}

public int getCircumference(){

return (this.length + this.width) * 2;

}

public Rectangle(){}

public Rectangle(int l, int w){

this.length = l;

this.width = w;

}

}

public class demo{

public static void main(String[] args) {

Rectangle rect = new Rectangle(30, 8);

System.out.print("长方形的面积是:");

System.out.println(rect.getArea());

System.out.printf("长方形的周长是:%d\n", rect.getCircumference());

}

}

如何用java写矩形平移和旋转后输出坐标的代码

import java.applet.Applet;

import java.awt.Graphics;

import java.awt.Color;

public class LX3_3 extends Applet {

public void paint(Graphics g) {

g.setColor(Color.red);//设置红颜色

g.drawOval(35,35,100,60);//画椭圆(圆心、宽和高)

g.fillOval(200,15,60,100);//画具有填充色的圆

g.setColor(Color.blue);//设置蓝颜色

g.drawRect(20,130,80,80);//画矩形

g.fillRect(120,130,80,80);//画具有填充色的矩形

g.drawRoundRect(220,130,80,80,20,20);//画圆角矩形

g.fillRoundRect(320,130,80,80,20,20);//画具有填充色的 圆角矩形

}

}

该程序是在Myeclipse的环境下运行的

在二维平面内,画长方形等都只需要改变点的坐标即可实现平移,旋转,缩放

上面还加入了颜色,可供参考

水平有限,但希望对你有帮助

java中做一个按钮,点击按钮后画一个矩形的代码怎么写?

兄弟帮你写了一个:

import java.awt.Button;

import java.awt.Color;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.util.Random;

public class Print {

public static void main(String[] args) {

new Te();

}

}

class Te extends Frame implements ActionListener {

Color cc = Color.red;

int x = -20, y = -50;

Random r = new Random();

public Te() {

this.setLayout(null);

Button b = new Button("画圆");

this.add(b);

b.setBounds(30,30,50,50);

b.addActionListener(this);

this.addWindowListener(new WindowAdapter () {

@Override

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

this.setBounds(200,200,500,400);

this.setVisible(true);

}

public void actionPerformed(ActionEvent e) {

this.cc = Color.red;

this.x = r.nextInt(400);

do {

int x1 = r.nextInt(300);

this.y = x1;

} while (this.y 50);

this.repaint();

}

@Override

public void paint(Graphics g) {

Color c = g.getColor();

g.setColor(cc);

g.drawRect(x,y,50,50);

g.setColor(c);

}

}

Java编程求矩形的面积

import java.util.*;

public class Rectangle {

private float length; //定义长变量

private float width; // 宽变量

public Rectangle(float length,float width){

this.length=length;

this.width=width;

}

public float getGirth(){

return (length+width)*2;

} //求周长方法

public float getArea(){

return length*width;

} //求面积方法

public static void main (String[] args) {

Scanner in=new Scanner(System.in);//调用输入方法

System.out.println ("请输入矩形的长:");

float a=in.nextFloat();

System.out.println ("请输入矩形的宽:");

float b=in.nextFloat();

System.out.println ("矩形周长为:"+new Rectangle(a,b).getGirth());

System.out.println ("矩形面积为:"+new Rectangle(a,b).getArea());

}

}


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