求java經(jīng)典小程序代碼

代碼如下：

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public class HelloWorld {

public static void main(String []args) {

int a = 3, b = 7 ;

?System.out.println("Hello World!");

}

public static int f(int a, int b){

return a*a + a*b + b*b;

}

}

結(jié)果如下：

java 小程序源代碼

求素?cái)?shù)，比較經(jīng)典的，下面是代碼及注釋

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public class Sushu {

/**

* 判斷一個(gè)數(shù)是不是素?cái)?shù)

* @param a 被判斷的數(shù)

* @return 是素?cái)?shù)返回真

*/

public boolean isSuhu(int a){

boolean isSushu=true;

//根據(jù)素?cái)?shù)的性質(zhì)判斷一個(gè)數(shù)是否為素?cái)?shù)

for(int i=2;ia;i++){

if(a%i==0){

isSushu=false;

break;

}

}

return isSushu;

}

/**

* 判斷連續(xù)若干個(gè)數(shù)中那些是素?cái)?shù)

* @param start 起始數(shù)

* @param end 終止數(shù)

*/

public void selectSushu(int start,int end){

//判斷一串?dāng)?shù)中那些為素?cái)?shù)，并將結(jié)果打印出來(lái)

for(int i=start;i=end;i++){

if(isSuhu(i)){

System.out.println(i);

}

}

}

public static void main(String []args){

//定義起始位置和終止位置

int start=1;

int end=100;

//聲明變量

Sushu s=new Sushu();

//調(diào)用方法

s.selectSushu(start, end);

}

}

求一個(gè)java applet小程序的源代碼

import?java.applet.Applet;

import?java.awt.Button;

import?java.awt.Color;

import?java.awt.Graphics;

import?java.awt.TextField;

import?java.awt.event.ActionEvent;

public?class?Nicki?extends?Applet{

private?static?final?long?serialVersionUID?=?1L;

private?Button?ok;

private?int?num=32;

private?int?resu=0;

private?boolean?isRig=false;

private?TextField?iPut;

public?Nicki(){

this.setLayout(null);

ok=new?Button("OK");

ok.setActionCommand(getName());

ok.setBounds(150,?150,?40,?20);

iPut=new?TextField();

this.add(iPut);

iPut.setBounds(100,?150,?40,?20);

this.add(ok);

ok.addActionListener(new?ButtonAction(this));

}

public?void?paint(Graphics?g){

g.setColor(Color.white);

g.fillRect(0,?0,?this.getWidth(),?this.getHeight());

g.setColor(Color.BLACK);

g.drawString("Please?guess?a?number?",?10,?20);

g.drawString("between?1?and?100",?10,?40);

if(isRig==falseresu!=0){

if(resunum){

g.drawString(""+resu+"?is?too?big?!",?10,?100);

}else?if(resunum){

g.drawString(resu+"is?too?small?!",?10,?100);

}

}else?if(isRig==true){

g.setColor(Color.GREEN);

g.drawString("Yes,"+resu+"?is?the?right?number",?10,?80);

g.drawString("Your?are?great!?",?10,?100);

g.setColor(Color.red);

g.drawString(resu+"!",?70,?120);

}

iPut.setText("");

g.drawString("Input?the?number：",?0,?150);

}

public?void?ButtonActionPerformed(ActionEvent?e){

if(e.getActionCommand().equals("panel0")){

resu=Integer.parseInt(iPut.getText());

if(num==resu){

isRig=true;

}else{

isRig=false;

}

repaint();

}

}

}

class?ButtonAction?implements?java.awt.event.ActionListener{

Nicki?su;

public?ButtonAction(Nicki?bun){

this.su=bun;

}

public?void?actionPerformed(ActionEvent?e)?{

su.ButtonActionPerformed(e);

}

}