java矩形的代码 java矩形类的定义和调用

急求java矩形九九乘法表代码，是矩形，不是梯形，谢谢。

public class TestBaiduKnow {

public static void main(String[] args) {

for (int i = 0; i = 9; i++) {

for (int j = 0; j = 9; j++) {

System.out.print(i + " * " + j + " = " + i * j + "\t");

}

System.out.println();

}

}

}

相关问答

Q1: 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

Q2: 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java矩形的代码：");

float a=in.nextFloat();

System.out.println ("请输入矩形的宽java矩形的代码：");

float b=in.nextFloat();

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

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

}

}

Q3: 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);

}

}

Q4: java 画矩形

java矩形的代码你的代码有问题java矩形的代码，你的类本身是framejava矩形的代码，你也在类中绘制，但是你却没有显示，而是另外定义java矩形的代码了一个frame来显示，你修改一下java矩形的代码：

import java.awt.Color;

import java.awt.Component;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.Rectangle;

public class FrameTest extends Frame {

/**

* @param args

*/

public void paint(Graphics g)

{

super.paint(g);

g.setColor(Color.black);

g.fillRect(100, 100, 30, 30);

try {

Thread.sleep(500);

}

catch (Exception ex) {

ex.printStackTrace();

}

//repaint();

}

FrameTest()

{

super("title");

setLocation(100,100);

setSize(600,400);

setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

FrameTest ft=new FrameTest();

}

}

这样应该没问题了。

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