16個經典java小程式
1
public class add{
public static void main(String args[]){
String a,b,c;
a="Hello World!";
b="from all students of";
c="2007";
System.out.println(a+b+c);
}
}
2
import java.awt.*;
import java.applet.Applet;
public class javademo extends Applet{
public void paint(Graphics g){
String a,b,c,d;
a="Hello World!";
b="from all students of";
c=" 2007";
d=a+b+c;
g.drawString(d,60,30);
}
}
3
public class javademo{
public static void main(String args[]){
int i,j;
int h=7;
int yanghui[][]=new int[7][];
System.out.println("楊輝三角形");
for(i=0;i<yanghui.length;i++){yanghui[i]=new int[i+1];yanghui[0][0]=1;} for(i=1;i<yanghui.length;i++){
yanghui[i][0]=1;
for(j=1;j<yanghui[i].length-1;j++){yanghui[i][j]=yanghui[i-1][j-1]+yanghui[i-1][j];} yanghui[i][yanghui[i].length-1]=1;
}
for(i=0;i<yanghui.length;i++){
for(j=0;j<yanghui[i].length;j++)
System.out.print(yanghui[i][j]+" ");
System.out.println();
}
}
}
4
public class javademo{
public static void main(String args[]){
int i,j;
int h=7;
int yanghui[][]=new int[7][];
System.out.println("楊輝三角形");
for(i=0;i<yanghui.length;i++){yanghui[i]=new int[i+1];yanghui[0][0]=1;} for(i=1;i<yanghui.length;i++){
yanghui[i][0]=1;
for(j=1;j<yanghui[i].length-1;j++){yanghui[i][j]=yanghui[i-1][j-1]+yanghui[i-1][j];} yanghui[i][yanghui[i].length-1]=1;
}
for(i=0;i<yanghui.length;i++){
for(int k=0;k<2*(yanghui.length-i)-1;k++){System.out.print(" ");}
for(j=0;j<yanghui[i].length;j++)
System.out.print(yanghui[i][j]+" ");
System.out.println();
}
}
5
public class javademo{
public static void main(String args[]){
int f1=1,f2=2,f,n=24;
System.out.println("第1個月兔子對數："+f1);
System.out.println("第2個月兔子對數："+f2);
for(int i=3;i<=24;i++){
f=f2;
f2=f1+f2;
f1=f;
System.out.println("第"+i+"個月兔子對數："+f2);
}
}
}
6
public class javademo{
public static void main(String args[]){ int count=0;
for(int i=101;i<200;i+=2){ boolean b=false;
for(int j=2;j<Math.sqrt(i);j++){ if(i%j==0){b=false;break;} else b=true;
}
if(b==true){count++;System.out.print(i+" ");} }
System.out.print("\n素數的個數為：\n"+count); }
}
7
public class javademo{
public static void main(String args[]){ int b1,b2,b3;
for(int i=100;i<1000;i++){ b1=i%10;
b2=i%100/10;
b3=i/100;
if(i==b1*b1*b1+b2*b2*b2+b3*b3*b3){ System.out.println(+i+"是一個水仙花數"); }
}
}
}
8
import java.util.*;
public class javademo{
public static void main(String args[]){ Scanner s=new Scanner(System.in); System.out.println("請輸入一個正整數"); int n=s.nextInt();
int k=2;
System.out.print(n+"=");
while(k<=n){
if(k==n){System.out.println(n);break;}
else if(n%k==0){System.out.print(k+"*");n=n/k;}
else k++;
}
}
}
9
import java.util.*;
public class javademo{
public static void main(String args[]){
Scanner s=new Scanner(System.in);
System.out.println("請輸入一個正整數");
int n=s.nextInt();
char grade=n>=90? 'A':n>=60?'B':'C';
System.out.println("該生等級為"+grade);
}
}
10
import java.util.*;
public class javademo{
public static void main(String args[]){
int a,b,m;
Scanner s=new Scanner(System.in);
System.out.println("請輸入一個數：");
a=s.nextInt();
System.out.println("請輸入另一個數：");
b=s.nextInt();
deff de=new deff();
m=de.deff(a,b);
int n=a*b/m;
System.out.println("最大公約數為："+m);
System.out.println("最大公倍數為："+n);
}
}
class deff{
public int deff(int x,int y){
int t,k;
if(x<y){t=x;x=y;y=t;}
while(y!=0){
if(x==y){return x;}
else{k=x%y;x=y;y=k;}
}
return x;
}
}
import java.util.*;
public class javademo{
public static void main(String args[]){
Scanner s=new Scanner(System.in);
System.out.println("請輸入數a：");
int a=s.nextInt();
System.out.println("請輸入相加項數：");
int n=s.nextInt();
int sum=0,b=0;
for(int i=0;i<n;i++){
b=b+a;
sum=sum+b;
a=10*a;
}
System.out.println(sum);
}
}
11
public class javademo{
public static void main(String args[]){
System.out.println("1000以內的完數有：");
for(int i=1;i<1000;i++){
int t=0;
for(int j=1;j<=i/2;j++){if(i%j==0)t=t+j;}
if(i==t)
System.out.print(i+" ");
}
}
}
12
public class javademo{
public static void main(String args[]){
int h=100,s=100;
for(int i=1;i<10;i++){
s=s+h;
h=h/2;
System.out.println("第"+(i+1)+"次下落經過的路程："+s);
System.out.println("第"+(i+1)+"次彈起的高度："+h/2);
}
}
}
13
public class javademo{
public static void main(String args[]){
int count=0;
int c;
for(int i=1;i<5;i++)
for(int j=1;j<5;j++)
for(int k=1;k<5;k++){
if(i!=j&&i!=k&&j!=k){
count++;
c=100*i+10*j+k;
System.out.print(c+" ");
if(count%10==0){System.out.println();}
}
}
System.out.println("\n符合要求的數個數為："+count);
}
}
14
import java.applet.*;
import java.awt.*;
public class javademo extends Applet{
Image img;
public void init(){
img=getImage(getCodeBase(),"w.jpg");
}
public void paint(Graphics g){
int w=img.getWidth(this);
int h=img.getHeight(this);
g.drawImage(img,20,40,this);
g.drawImage(img,100,100,w/2,h/2,this);
g.drawImage(img,160,10,2*w,2*h,this);
}
}
15
import java.applet.*;
import java.awt.*;
public class MoveDemo extends Applet{
Image sky;
int x=10;
public void init(){
sky=getImage(getCodeBase(),"China.jpg");
}
public void paint(Graphics g){
g.drawImage(sky,x,0,this);
try{
Thread.sleep(500);
x=x+15;
if(x==10000){
x=10;
Thread.sleep(1000);
}}catch(Exception e){}
repaint();
}
}
16
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.applet.AudioClip;
public class SoundPlay extends Applet implements ItemListener,ActionListener{ AudioClip sound;
Choice c=new Choice();
Button play=new Button("播放");
Button loop=new Button("連續");
Button stop=new Button("停止");
public void init(){
c.add("背景音樂 - Mid.wav");
//c.add("不得不愛 Wav 鈴音.wav");
c.add("王傑 - 一場遊戲一場夢 - 傷心幾分痴 粵語版 Wav8.wav"); c.add("兩隻小蜜蜂 - For Wav.wav");
//c.add("夏傷.wav");
add(c);
c.addItemListener(this);
add(play);
add(loop);
add(stop);
play.addActionListener(this);
loop.addActionListener(this);
stop.addActionListener(this);
sound=getAudioClip(getCodeBase(),"背景音樂 - Mid.wav"); }
public void itemStateChanged(ItemEvent e){
sound.stop();
sound=getAudioClip(getCodeBase(),c.getSelectedItem()); }
public void actionPerformed(ActionEvent e){
if(e.getSource()==play) sound.play();
else if(e.getSource()==loop) sound.loop();
else if(e.getSource()==stop) sound.stop();
}
}
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