15个经典JAVA小程序集

import java.util.Scanner;public class Example1 {public static void main(String[] args) {Scanner sc=new Scanner(System.in);//输入一个数字int score=sc.nextInt();//将数字放入整型score中if(score>0)//if语句进行判断{if(score>=90){System.out.println("你很棒！");}else if(score>=60&&score<90){System.out.println("你很不错!");}elseSystem.out.println("你得加油!");}elseSystem.out.println("你输入的数字不正确！");}}import java.util.Scanner;public class Example2 {public static void main(String[] args) {Scanner sc=new Scanner(System.in);//动态输入任意两个数int a=sc.nextInt();int b=sc.nextInt();if(a>b)//if语句比较大小{System.out.println("你所输入的最大值："+a);System.out.println("你所输入的最小值："+b);}else if(a<b){System.out.println("你所输入的最大值："+b);System.out.println("你所输入的最小值："+a);}else{System.out.println("你输入的两个数字相等："+a+"="+b);}}}public class Example3 {public static void main(String[] args) {//请输出1－100的累加和int s=0;for(int i=1;i<=100;i++){s=s+i;}System.out.println("1-100的累加和为:"+s);}public class Example4 {public static void main(String[] args) {System.out.println("1-900的水仙数是：");for(int i=100;i<=900;i++)// 分析：利用for循环控制100－999个数，每个数分解出个位，十位，百位。

{int a=i/100;int b=(i/10)%10;int c=(i%100)%10;if(i==a*a*a+b*b*b+c*c*c){System.out.println(+i+"="+a+"的三次方+"+b+"的三次方+"+c+"的三次方");}}}}public class Example5 {public static void main(String[] args) {//请输出9*9乘法表for(int i=1;i<=9;i++){for(int j=1;j<=i;j++){int s=i*j;System.out.print(+i+"*"+j+"="+s);System.out.print(" ");}System.out.println("");}}}import java.util.Calendar;import java.util.Scanner;public class F1 {public static void main(String[] args) {//输入的年份Scanner a=new Scanner(System.in);int year=a.nextInt();System.out.println("输入的年份为："+year);//输入的月份Scanner b=new Scanner(System.in);int month=b.nextInt();System.out.println("输入的月份为："+month);//titleSystem.out.println("<<<<<<<<<<<<<迷你版万年历>>>>>>>>>>>>");System.out.println(" "+year+"年"+month+"月");String title[]={"日","一","二","三","四","五","六"};for(int i=0;i<=6;i++){System.out.print(title[i]+'\t');}System.out.println("");//导出日历类Calendar cal=Calendar.getInstance();//查看1号为星期几cal.set(Calendar.YEAR,year);cal.set(Calendar.MONTH, month-1);//0-11cal.set(Calendar.DA TE,1);//用来获取当前的日期，是星期几？int weekday=cal.get(Calendar.DAY_OF_WEEK);//留空格for(int i=1;i<=weekday-1;i++){System.out.print("\t");}int maxdate=cal.getActualMaximum(Calendar.DA TE);//获得最大的天数for(int i=1;i<=maxdate;i++){System.out.print(i+"\t");if((i+weekday-1)%7==0){System.out.println("");}}}}public class Str {public static void main(String[] args) {String str="y=10,x=20,name=zhuzhu,sex=female";String a="acdff";String b="dfgfag";int c=pareTo(b);//比较两个字符串System.out.println(c);String d=a.concat(b);//连接两个字符串System.out.println(d);if(a.equals(b)==true){System.out.println("right!");}elseSystem.out.println("worry!");String[]data=str.split(",");byte bs[]=str.getBytes();System.out.println(bs);String str2=new String(bs);}}import java.util.Scanner;public class Testarraylist {public static void main(String[] args) {Scanner sc=new Scanner(System.in);int age=0;while (true){try {String a=sc.nextLine();age=Integer.parseInt(a);break;} catch (Exception e) {System.out.println("worry!");}}System.out.println(age);}}import java.util.Random;public class Testdata {public static void main(String[] args) {Random rd=new Random();//随即生成数int red[]=new int[6];for(int i=0;i<red.length;i++){int rednum=rd.nextInt(33)+1;boolean flag=true;for(int j=0;j<=i;j++){if(rednum==red[j]){i--;flag=false;break;}}if(flag){red[i]=rednum;}}System.out.println("输出的红球是：");for(int i=0;i<red.length;i++){System.out.print(red[i]+"\t");}}}import java.awt.Frame;import java.awt.Graphics;import java.awt.HeadlessException;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;public class TestDrawImage extends Frame{//用一个工具类来专门装载图片Toolkit tool=Toolkit.getDefaultToolkit();int x=0;private void init() {setTitle("移动图片");setSize(800,500);setVisible(true);setLocationRelativeTo(null);setResizable(false);addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});ImageThread imgthread = new ImageThread();imgthread.start();}public void paint(Graphics g) {Imageimg=tool.getImage(TestDrawImage.class.getClassLoader().getResource("image/a.jpg"));g.drawImage(img, x, 150, null);}class ImageThread extends Thread{public void run(){while(true){ x+=10;if(x>=1000){x=0;}repaint();try {Thread.sleep(200);} catch (InterruptedException e){e.printStackTrace();}}}}public static void main(String[] args) {TestDrawImage ab=new TestDrawImage();ab.init();}}import java.io.InputStream;import javazoom.jl.decoder.JavaLayerException;import javazoom.jl.player.advanced.AdvancedPlayer;public class Testsound {public static void main(String[] args) {//加载mp3文件InputStream mp3=Testsound.class.getClassLoader().getResourceAsStream("music/你是我的眼.mp3");//2,创建一二个播放器AdvancedPlayer ad;try {ad = new AdvancedPlayer(mp3);//3,播放ad.play();} catch (JavaLayerException e) {}}}import java.awt.Color;import java.awt.Frame;import java.awt.Graphics;import java.awt.Point;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.util.ArrayList;import java.util.Random;public class Text1 extends Frame{ArrayList list_point=new ArrayList();ArrayList list_color=new ArrayList();Random rd=new Random();private Point p=new Point();public void init() {setSize(500,400);setTitle("画点");setVisible(true);setLocationRelativeTo(null);setResizable(false);addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});addMouseListener(new MouseAdapter() {public void mouseClicked(MouseEvent e) {p=e.getPoint();Color c=new Color(rd.nextInt(256), rd.nextInt(256), rd.nextInt(256));list_point.add(p);list_color.add(c);repaint();}});}public void paint(Graphics g) {for(int i=0;i<list_point.size();i++){Point p=(Point)list_point.get(i);Color c=(Color)list_color.get(i);g.setColor(c);g.fillOval(p.x, p.y,20, 20);}}public static void main(String[] args) {new Text1().init();}}import java.awt.Frame;import java.awt.Graphics;import java.awt.Point;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.util.ArrayList;public class Text2 extends Frame{ArrayList list_point=new ArrayList();private Point p=new Point();public void init() {setSize(500,400);setTitle("画点");setVisible(true);setLocationRelativeTo(null);setResizable(false);addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});addMouseListener(new MouseAdapter() {public void mouseClicked(MouseEvent e) {p=e.getPoint();list_point.add(p);repaint();}});}public void paint(Graphics g) {for(int i=0;i<list_point.size();i++){Point p=(Point)list_point.get(i);g.fillOval(p.x, p.y,20, 20);}}public static void main(String[] args) {new Text2().init();}}import java.awt.Frame;import java.awt.Graphics;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.util.ArrayList;import java.util.Random;import javax.swing.RepaintManager;public class Text3 extends Frame{public void init(){setTitle("彩票号码生成器！（点击窗体任何位置重新生成！）");setSize(500,400);setVisible(true);setLocationRelativeTo(null);setResizable(false);addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});addMouseListener(new MouseAdapter() {public void mouseClicked(MouseEvent e) {repaint();}});}public void paint(Graphics g) {Random rd=new Random();ArrayList list=new ArrayList();g.drawString("本期中奖号码", 100, 100);g.drawString("红色球是：", 100, 150);g.drawString("蓝色球是：",100 , 200);for(int i=0;i<6;i++){int red=rd.nextInt(33)+1;if(list.contains(red)){i--;}elselist.add(red);}int blue=rd.nextInt(16)+1;g.setColor(Color.blue);g.drawString(blue+"", 200, 200);g.setColor(Color.red);for(int i=0;i<6;i++){g.drawString(list.get(i)+"", 200+(i*50), 150);}}public static void main(String[] args) {new Text3().init();}}。