怎么写java程序

正好今天不忙，就当回忆回忆历史吧，呵呵。

public class Animal {

private String name;

private int legs;

public Animal(){

this("AAA",4);

}

public Animal(String name, int legs){

this.name = name;

this.legs = legs;

}

public String getName() {

return name;

}

public int getLegs() {

return legs;

}

public void move(){

System.out.println(this.name+" Moving!!");

}

public void move(int n){

if(n<0)

return;

for (int i = 0; i < n; i++) {

System.out.println(this.name+" Moving!!");

}

}

}

public class Fish extends Animal {

public Fish(String name){

super(name,0);

}

public void move() {

System.out.println(getName()+" Swimming!!");

}

}

public class Bird extends Animal {

public Bird(String name){

super(name,2);

}

public void move() {

System.out.println(getName()+" Flying!!");

}

}

public class Zoo {

/**

* @param args

*/

public static void main(String[] args) {

Animal animal = new Animal();

Fish fish = new Fish("shayu");

Bird bird = new Bird("dayan");

}

}

public class A

{

public static void main(String[] args)

{

Scanner in = new Scanner(System.in);

int max = Integer.MIN_VALUE;

int min = Integer.MAX_VALUE;

int sum = 0;

for (int i = 0; i < 6; i++)

{

int j = in.nextInt();

if (max < j) max = j;

if (min > j) min = j;

sum += j;

}

double avg = sum / 6.;

System.out.println("max =" + max);

System.out.println("min =" + min);

System.out.println("sum =" + sum);

System.out.println("avg =" + avg);

}

}

public class Book {

private String name；//名称属性

private Integer page； //页数属性

public Book(String name,Integer page){//带参数的构造方法

this.name = name;

this.page = page;

}

//属性的get,set方法

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getPage() {

return page;

}

public void setPage(Integer page) {

this.page = page;

}

//get,set方法结束

/**

* @param args

*/

public static void main(String[] args) {

Map map = new HashMap（)； //定义MAP

for (int i = 0; i

例子1:

import java.io.*;

public class Demo1{

public static void main(String[] args) throws IOException{

BufferedReader input=new BufferedReader(new InputStreamReader(System.in));

String str=input.readLine();

int number=Integer.parseInt(str);

for(int i=3;i<number;i++)

{

if(isShu(i))

System.out.println(i);

}

}

private static boolean isShu(int number)

{

boolean flag=true;

for(int i=2;i<number;i++)

{

if(number%i==0)

{

flag=false;

break;

}

}

return flag;

}

}

例子2:

import java.util.*;

public class Demo2

{

public static void main(String[]args)

{

int[] num=new int[10];

for(int i=0;i<10;i++)

{

num[i]=((int)(Math.random()*100));

}

Arrays.sort(num);

System.out.println（"最大值："+num[num.length-1]）;

System.out.println（"最小值："+num[0]）;

}

}

例子3:

public class Demo3

{

public static void main(String[]args)

{

Scanner input=new Scanner(System.in);

System.out.println（"请输入一个整数："）；

String temp=input.nextLine();

String result="";

char[] c=temp.toCharArray();

for(int i=0;i<c.length;i++)

{

if(c[i]%2==0)

{

result+=String.valueOf(c[i]);

}

}

System.out.println（"最后结果为："+result）;

}

}

正好今天不忙，就当回忆回忆历史吧，呵呵。

public class Animal { private String name; private int legs; public Animal(){ this("AAA",4); } public Animal(String name, int legs){ this.name = name; this.legs = legs; } public String getName() { return name; } public int getLegs() { return legs; } public void move(){ System.out.println(this.name+" Moving!!"); } public void move(int n){ if(n<0) return; for (int i = 0; i < n; i++) { System.out.println(this.name+" Moving!!"); } }}public class Fish extends Animal { public Fish(String name){ super(name,0); }public void move() { System.out.println(getName()+" Swimming!!"); }}public class Bird extends Animal { public Bird(String name){ super(name,2); } public void move() { System.out.println(getName()+" Flying!!"); }}public class Zoo { /** * @param args */ public static void main(String[] args) { Animal animal = new Animal(); Fish fish = new Fish("shayu"); Bird bird = new Bird("dayan"); }}。

import java.awt.Color; import java.awt.Container; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class CircleFrame { private Circle[] circles = null; private JFrame frame = null; final int circleNumber = 20; final int maxCircleDiameter = 50; private final Color contactColor = Color.BLACK; private final Color apartColor = Color.BLUE; public CircleFrame() { initFrame(); initCircle(); drawColor(); showCircle(); } private void showCircle() { JPanel panel = new MyPanel(); panel.setBounds(0, 0, 800, 600); Container container = frame.getContentPane(); container.setLayout(null); container.add(panel); } class MyPanel extends JPanel { private static final long serialVersionUID = 1L; public void paint(Graphics graphics) { for (int i = circles.length - 1; i >= 0; i--) { graphics.setColor(circles[i].color); final int diameter = circles[i].diameter; graphics.drawOval(circles[i].x - diameter, circles[i].y - diameter, diameter * 2, diameter * 2); } } } private void drawColor() { int delX, delY, sumDiameter; for (int i = circles.length - 1; i > 0; i--) { for (int j = i - 1; j >= 0; j--) { delX = circles[i].x - circles[j].x; delY = circles[i].y - circles[j].y; sumDiameter = circles[i].diameter + circles[j].diameter; if (delX * delX + delY * delY < sumDiameter * sumDiameter) { circles[i].color = contactColor; circles[j].color = contactColor; } } } } private void initCircle() { circles = new Circle[circleNumber]; int x, y, diameter; for (int i = 0; i < circles.length; i++) { x = (int)(Math.random() * frame.getWidth()); y = (int)(Math.random() * frame.getHeight()); diameter = (int)(Math.random() * maxCircleDiameter + 1); circles[i] = new Circle(x, y, diameter); circles[i].color = apartColor; } } private void initFrame() { frame = new JFrame("Draw Circle"); frame.setSize(800, 600); frame.setResizable(false); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void show() { frame.setVisible(true); } public static void main(String[] args) { CircleFrame tenCircle = new CircleFrame(); tenCircle.show(); } } class Circle { int x, y, diameter; Color color = null; public Circle(int x, int y, int diameter) { this.x = x; this.y = y; this.diameter = diameter; } public String toString() { return "[x=" + x + ", y=" + y + ", diameter=" + diameter + "], Color:" + color; } }。