java一个简单小程序，求高手帮忙编写，万分感谢

class Ball {

public void play() {

Systemoutprintln("玩球儿");

}

}

class Football extends Ball {

public void play() {

Systemoutprintln("使用足球运动");

}

}

class Basketball extends Ball {

public void play() {

Systemoutprintln("使用篮球运动");

}

}

public class TestMain {

public static void main(String[] args) {

TestMain tm = new TestMain();

tmtestPlay();

}

public void testPlay() {

Ball ball = new Football();

ballplay();

ball = new Basketball();

ballplay();

}

}

/

D:\>javac TestMainjava

D:\>java TestMain

使用足球运动

使用篮球运动

/

package com;

public interface PlaneGraphics {

public abstract double area();

public abstract double perimeter();

public abstract void print();

}

package com;

public class Rectangle implements PlaneGraphics{

private double x = 75;

private double y = 157;

private double s = 0;

private double l= 0;

public double area() {

s = x y;

return s;

}

public double perimeter() {

l = 2 (x + y);

return l;

}

public void print() {

Systemoutprintln("这是长方形");

Systemoutprintln("长方形的宽度："+x+"长方形的长度："+y);

Systemoutprintln("长方形的面积："+s);

Systemoutprintln("长方形的周长："+l);

}

package com;

public class Ellipse implements PlaneGraphics {

private double a = 57;

private double b = 25;

private double s = 0;

private double l = 0;

private double pie = 314;

public double area() {

s = pie a b;

return s;

}

public double perimeter() {

double m = 0;

m = javalangMathsqrt(a b);

l = pie (15 (a+b) - m);

return l;

}

public void print() {

Systemoutprintln("这是椭圆形");

Systemoutprintln("椭圆形的a轴长："+a+"椭圆形的b轴长："+b);

Systemoutprintln("椭圆形的面积："+s);

Systemoutprintln("椭圆形的周长："+l);

}

}

package com;

public class Test {

public static void main(String[] args) {

Rectangle rec = new Rectangle();

recarea();

recperimeter();

recprint();

Ellipse ell = new Ellipse();

ellarea();

ellperimeter();

ellprint();

}

}

public test_03(){

init();

}

public void init(){

JLabel jl_1=new JLabel("用户名");

JLabel jl_2=new JLabel("密码");

JTextField jtf=new JTextField();

JPasswordField jpf=new JPasswordField();

JButton button_1=new JButton("确定");

JPanel panel=new JPanel();

panelsetLayout(null);

jl_1setBounds(30, 50, 50, 30);

jl_2setBounds(30,90,50,30);

jtfsetBounds(100, 50, 100, 30);

jpfsetBounds(100, 90, 100, 30);

button_1setBounds(110, 130, 80, 30);

paneladd(jl_1);

paneladd(jl_2);

paneladd(jtf);

paneladd(jpf);

paneladd(button_1);

thisadd(panel);

thissetSize(300, 250);

thissetLocation(400, 300);

thissetVisible(true);

}

public static void main(String[] args) {

new test_03();

}

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