急求大神发几个java 300行代码的小程序 简单点的

/**

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* 文件名：Operation.java 2014-1-2 下午3:06:37

* @author Administrator

*/

package cc.icoc.javaxu.action;

import java.util.ArrayList;

import java.util.Scanner;

import cc.icoc.javaxu.datas.StudentInfo;

/**

* @author 许仕永

* 创建时间: 2014 2014-1-2 下午3:06:37

*/

public class Operation

{

int stuNo,stuAge;

String stuName,stuClass,stuSex;

ArrayListStudentInfo list;

/**程序入口

* @param args

*/

public static void main(String[] args)

{

// TODO Auto-generated method stub

new Operation().operation();

}

private int inputInt()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextInt();

}

private String inputStr()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextLine();

}

private void operation()

{

// TODO Auto-generated method stub

if(list == null)

{

list = new ArrayListStudentInfo();

}

while(true)

{

System.out.println("\t\t\t学生信息管理系统\n");

System.out.println("1.信息查阅");

System.out.println("2.信息查询");

System.out.println("3.信息录入");

System.out.println("4.退出系统");

int what = inputInt();

if ( what == 1 )

{

getInfo();

} else if ( what == 2 )

{

allSerach();

} else if ( what == 3 )

{

inputInfo();

} else if( what == 4 )

{

System.out.println("已经退出系统");

System.exit(0);

}

}

}

/**

* 获取全部学生的信息列表

*/

private void getInfo()

{

if(!list.isEmpty())

{

for ( int i = 0; i list.size(); i++ )

{

System.out.println(list.get(i));

}

}

}

/**

* 执行查找

*/

private void allSerach()

{

System.out.println("1.输入学号进行查询");

System.out.println("2.输入姓名进行查询");

int what = inputInt();

if(what == 1)

{

System.out.println("请输入学号：");

search(inputInt());

}

else

{

System.out.println("请输入姓名：");

search(inputStr());

}

}

/**

* 按学生姓名查询学生信息

* @param name 学生姓名

*/

private StudentInfo search(String name)

{

for ( int i = 0; i list.size(); i++ )

{

if(list.get(i).getStuName().equals(name))

{

System.out.println(list.get(i));

return list.get(i);

}

}

System.out.println("未查询到该名字的学生");

return null;

}

/**

* 按学号查询学生信息

* @param id 学号

*/

private StudentInfo search(int id)

{

for ( int i = 0; i list.size(); i++ )

{

if(list.get(i).getStuNo()==id)

{

System.out.println(list.get(i));

return list.get(i);

}

}

System.out.println("未查询到该学号的学生");

return null;

}

/**

* 录入学生信息

*/

private void inputInfo()

{

try

{

System.out.print("请输入学生学号：\n");

stuNo = inputInt();

System.out.print("请输入学生姓名：\n");

stuName = inputStr();

System.out.print("请输入学生性别：\n");

stuSex = inputStr();

System.out.print("请输入学生年龄：\n");

stuAge = inputInt();

System.out.print("请输入学生班级：\n");

stuClass = inputStr();

list.add(new StudentInfo(stuNo, stuAge, stuName, stuSex, stuClass));

} catch (Exception e)

{

// TODO: handle exception

System.out.println("不允许为空，请重新输入");

}

}

}

package cc.icoc.javaxu.action;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class Stu

{

int countStu = 0;

int sum = 0;

int avg = 0;

ListStuBean list = new ArrayListStu.StuBean();

public static void main(String[] args)

{

new Stu().go();

}

private void go()

{

A:while(true)

{

//构造实体Bean来存储学生成绩

StuBean bean = new StuBean();

System.out.println("请输入成绩：");

System.out.println("语文：");

bean.setYuwen(scanner());

System.out.println("数学：");

bean.setMath(scanner());

//获取英语成绩

System.out.println("英语：");

bean.setEnglish(scanner());

//存入容器

list.add(bean);

for ( int i = 0; i list.size(); i++ )

{

sum += list.get(i).english+list.get(i).math+list.get(i).yuwen;

}

avg = sum / (3*list.size());

System.out.println("当前有"+list.size()+"条学生记录，所有学生总分="+sum+"平均分为"+avg);

//输入y继续录入学生信息，输入x退出

System.out.println("\n已成功录入一个学生的数据，是否继续/退出(y/x)");

if("x".equals(scannerString()))

break A;

}

}

/**输入*/

private int scanner()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextInt();

}

/**输入*/

private String scannerString()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextLine();

}

class StuBean

{

int math;

int yuwen;

int english;

public int getMath()

{

return math;

}

public void setMath(int math)

{

this.math = math;

}

public int getYuwen()

{

return yuwen;

}

public void setYuwen(int yuwen)

{

this.yuwen = yuwen;

}

public int getEnglish()

{

return english;

}

public void setEnglish(int english)

{

this.english = english;

}

}

}

/**

* 文件名：StudentInfo.java 2014-1-2 下午3:07:29

* @author Administrator

*/

package cc.icoc.javaxu.datas;

/**

* @author 许仕永

* 创建时间: 2014 2014-1-2 下午3:07:29

*/

public class StudentInfo

{

int stuNo,stuAge;

String stuName,stuSex,stuClass;

public StudentInfo(int stuNo, int stuAge, String stuName, String stuSex, String stuClass)

{

super();

this.stuNo = stuNo;

this.stuAge = stuAge;

this.stuName = stuName;

this.stuSex = stuSex;

this.stuClass = stuClass;

}

public int getStuNo()

{

return stuNo;

}

public void setStuNo(int stuNo)

{

this.stuNo = stuNo;

}

public int getStuAge()

{

return stuAge;

}

public void setStuAge(int stuAge)

{

this.stuAge = stuAge;

}

public String getStuName()

{

return stuName;

}

public void setStuName(String stuName)

{

this.stuName = stuName;

}

public String getStuSex()

{

return stuSex;

}

public void setStuSex(String stuSex)

{

this.stuSex = stuSex;

}

public String getStuClass()

{

return stuClass;

}

public void setStuClass(String stuClass)

{

this.stuClass = stuClass;

}

@Override

public String toString()

{

// TODO Auto-generated method stub

String s = "学号："+getStuNo()+"\t姓名："+getStuName()+" \t性别："+getStuSex()+"\t年龄："+getStuAge()+"\t班级："+getStuClass();

return s;

}

}

求java经典小程序代码

代码如下：

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;

}

}

结果如下：

JAVA小程序编写

1.JavaPow.java

import java.util.Scanner;

public class JavaPow {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.print("请输入一个数求平方:");

double num = sc.nextDouble();

System.out.println(num + "的平方结果是:" + Math.pow(num, 2));

}

}

2.CompareTest.java

public class CompareTest {

public static void main(String[] args) {

int a = 10, b = 8;

if(ab){

System.out.println("排序结果是:"+b+"\t"+a);

}else{

System.out.println("排序结果是:"+a+"\t"+b);

}

}

}

3.RateMoney.java

import java.util.Scanner;

public class RateMoney {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

double money=0;

double rate=0;

System.out.print("请输入汇款金额：");

money=sc.nextDouble();

if(money0){

rate=0;

}

else if(money0money=100){

rate=1;

}else if(money100money=5000){

rate=money/100;

}else{

rate=50;

}

System.out.println("汇"+money+"元钱需汇款费："+rate+"元");

}

}

三个都已经写出来了..

你好好看看吧!!

祝你早日成功!

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