JAVA,写一个名为Rectangle的类表示矩形

这个我做完了 希望您能满意

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public class Rectangle {

private double height;

private double width;

private String color;

public double getHeight() {

return height;

}

public void setHeight(double height) {

this.height = height;

}

public double getWidth() {

return width;

}

public void setWidth(double width) {

this.width = width;

}

public String getColor() {

return color;

}

public void setColor(String color) {

this.color = color;

}

public Rectangle(double width,double height,String color){

this.setColor(color);

this.setHeight(height);

this.setWidth(width);

}

public void getArea(){

double area=0;

area=this.height*this.width;

System.out.println("矩形的面积为"+area);

}

public String toString(){

String recStr="矩形的高度："+this.getHeight()+"宽度："+this.getWidth()

+"颜色:"+this.getColor();

return recStr;

}

/**

* 测试函数

* @param args

*/

public static void main(String[] args) {

Rectangle rec=new Rectangle(3, 4, "红色");

rec.getArea();

System.out.println(rec.toString());

}

}

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);

}

}

编写一个JAVA程序，描写一个矩形类，并输出某个矩形的长，宽，面积。具体描述如下？

// 矩形

public class RectangleDemo {

public static void main(String[] args) {

RectangleDemo demo = new RectangleDemo(12, 32);

System.out.println(demo.getPerimeter());

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

demo = new RectangleDemo();

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

System.out.println(demo.getPerimeter());

demo.setHeight(50);

demo.setWidth(30);

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

System.out.println(demo.getPerimeter());

}

// 求周

public double getPerimeter() {

return (height + width) * 2;

}

// 求面积

public double getArea() {

return height * width;

}

public RectangleDemo(double height, double width) {

this.height = height;

this.width = width;

}

public RectangleDemo() {

this.height = 10;

this.width = 10;

}

private double height;// 高度

private double width;// 宽度

public double getHeight() {

return height;

}

public void setHeight(double height) {

this.height = height;

}

public double getWidth() {

return width;

}

public void setWidth(double width) {

this.width = width;

}

}

编写矩形类RectangleJava程序矩形类两数据员别rLength宽rWidth通getLength()、getWidth()、getArea()别查看矩形、宽面积通setLength()setWidth()重新设置矩形宽

Java编写一个矩形类，并计算面积和周长？

class Rectangle{

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());

}

}