简单的java测试代码 java代码在线测试

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急！！！简单JAVA编程代码

public class Test {

public static void main(String[] args) {

MyRectangle rec = new MyRectangle(3, 5);

MyRectangle square = new MySquare(4);

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

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

}

class MyRectangle{

protected double width;

protected double length;

public MyRectangle(double length, double width){

this.width = width;

this.length = length;

}

public double getLength() {

return length;

}

public double getWidth() {

return width;

}

public void setWidth(double width) {

this.width = width;

}

public double getArea(){

return this.width * this.length;

}

public String toString(){

return "长方形的长为：" + length + ", 宽: " + width + ", 面积为:" + getArea();

}

class MySquare extends MyRectangle{

public MySquare(double length){

super(length, length);

}

public double getArea(){

return Math.pow(super.width, 2);

}

public String toString(){

return "正方形边长为: " + super.length + ", 面积为: " + getArea();

}

----------测试

长方形的长为：3.0, 宽: 5.0, 面积为:15.0

正方形边长为: 4.0, 面积为: 16.0

相关问答

Q1: 求一段简单JAVA代码非常简单

import java.util.LinkedList;

import java.util.List;

import java.util.Random;

public class Group {

public static void main(String[] args) {

ListInteger l = new LinkedListInteger();

int[][] group = new int[4][7];

Random r = new Random();

for (int i = 0; i 31; i++)

l.add(new Integer(i + 1));

for (int i = 0; i 4; i++) {

for (int j = 0; j 7; j++) {

int k = r.nextInt(l.size());

group[i][j] = l.get(k);

l.remove(k);

}

for (int i = 0; i 4; i++) {

System.out.print("Group " + (i + 1) + ": ");

for (int j = 0; j 7; j++) {

System.out.print(group[i][j] + " ");

}

System.out.println();

}

// 剩下分组

String groups = "";

for(Integer _tem : l) {

groups += _tem + " ";

}

System.out.print("Group " + "5" + ": " + groups);

}

Q2: 给段最简单的java代码让我新手看一下

最简单的java代码肯定就是这个了，如下：

public class MyFirstApp

{

public static void main(String[] args)

{

System.out.print("Hello world");

}

“hello world”就是应该是所有学java的新手看的第一个代码了。如果是零基础的新手朋友们可以来我们的java实验班试听，有免费的试听课程帮助学习java必备基础知识，有助教老师为零基础的人提供个人学习方案，学习完成后有考评团进行专业测试，帮助测评学员是否适合继续学习java，15天内免费帮助来报名体验实验班的新手快速入门java，更好的学习java！

Q3: 一个简单的Java程序代码？

package com.zpp;public class Charge {

public static void main(String [] args) {

if(args.length ==0) {

System.out.println("parameter error!");

System.out.println("java com.zpp.Charge [int]");

return;

}

int min = Integer.parseInt(args[0]);

double money = 0.0;

if (min = 0) {

money =0.0;