java点名小程序代码 JAVA小程序代码

下面这个Java小程序应该怎么命名呢 纯新手 不懂 只在书上看到了代码 boy extends Applet.Java这样不可以

应该命名为boy.java。。。。

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类名是boy，不是boy extends Applet，extends只是描述。。。。

另外，类名建议首字母大写

java 小程序源代码

求素数，比较经典的，下面是代码及注释

================================================

public class Sushu {

/**

* 判断一个数是不是素数

* @param a 被判断的数

* @return 是素数返回真

*/

public boolean isSuhu(int a){

boolean isSushu=true;

//根据素数的性质判断一个数是否为素数

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

if(a%i==0){

isSushu=false;

break;

}

}

return isSushu;

}

/**

* 判断连续若干个数中那些是素数

* @param start 起始数

* @param end 终止数

*/

public void selectSushu(int start,int end){

//判断一串数中那些为素数，并将结果打印出来

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

if(isSuhu(i)){

System.out.println(i);

}

}

}

public static void main(String []args){

//定义起始位置和终止位置

int start=1;

int end=100;

//声明变量

Sushu s=new Sushu();

//调用方法

s.selectSushu(start, end);

}

}

谁能给个JAVA的小程序代码，越小越好！

这是我晓得的最简单的java小程序代码了你可以看看:

package com.kenki.emp;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

import java.sql.SQLException;

import java.sql.*;

public class emp extends HttpServlet {

private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables

public void init() throws ServletException {

}

//Process the HTTP Get request

public void doGet(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

response.setContentType(CONTENT_TYPE);

PrintWriter out = response.getWriter();

String code = request.getParameter("code");

String name = request.getParameter("name");

String pay = request.getParameter("pay");

System.out.println("empcode:" + code);

System.out.println("name:" + name);

System.out.println("pay:" + pay);

//创建驱动

new com.microsoft.jdbc.sqlserver.SQLServerDriver();

String strd =

"jdbc:microsoft:sqlserver://localhost:1433;databasename=emp_dates";

String username = "sa";

String pws = "";

try {

java.sql.Connection conn = java.sql.DriverManager.getConnection(

strd, username, pws);

String strs = "insert into emp values(?,?,?)";

java.sql.PreparedStatement pre = conn.prepareStatement(strs);

pre.setString(1, code);

pre.setString(2, name);

pre.setString(3, pay);

pre.execute();

pre.close();

conn.close();

//重定向至查询页面

out.println("成功保存！！");

response.sendRedirect("emp.html");

} catch (SQLException ss) {

ss.printStackTrace();

response.sendRedirect("/WebModule1/error.html");

}

}

//Process the HTTP Post request

public void doPost(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

doGet(request, response);

}

//Clean up resources

public void destroy() {

}

}

java简单小程序，NAME:输入名字，NUMBER:输入学号，mark：输入分数。直到输入end结束。

import java.util.Scanner;

public class a {

public static void main(String[] args) {

String result=null;

double sum = 0;

int i=0;

String str = "";

do {

Scanner in = new Scanner(System.in);

System.out.print("输入姓名：");

String name=in.next();

System.out.print("输入学号：");

String num = in.next();

System.out.print("输入分数：");

double score = in.nextDouble();

i++;

sum+=score;

System.out.print("是否结束：(end/其它任意键)");

result = in.next();

str+=name+"\r"+num+"\r\t"+score+"\r";

} while (!result.equals("end"));

System.out.println("输出信息结果："+str+"\r\n");

System.out.println("平均分："+sum/i);

}

}

直接复制一下，就可以运行，看是不是你要的效果。（不过没有对输入的值做判断，自己可以对输入做一下判断）

这个也可以用for循环来做

java做个小程序 100-200代码就行了

我给你一个功能强大的计算器!已运行通过!

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Calculator3 extends JFrame implements ActionListener {

private boolean dotExist, operated, equaled; // 帮助运算的布尔变量

private double storedNumber; // 目前的结果

private char lastOperator; // 表示上一运算符

private JTextField operation; // 结果栏

private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; // 运算符

private JButton[] numbers; // 数字

// 构造者

public Calculator3() {

setTitle("Calculator");

// 初始化变量

dotExist = false; // 表示当前的数是否有小数点

operated = false; // 表示任意运算符是否被按下

equaled = false; // 表示等号是否被按下

storedNumber = 0;

lastOperator = '?';

// 初始化窗口变量

operation = new JTextField("0");

operation.setEditable(false);

numbers = new JButton[10];

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

numbers[i] = new JButton("" + i);

dot = new JButton(".");

plus = new JButton("+");

minus = new JButton("-");

multi = new JButton("*");

div = new JButton("/");

sqrt = new JButton("√");

equal = new JButton("=");

changePN = new JButton("±");

clear = new JButton("AC");

// 将窗口物体放入窗口

GridBagLayout layout = new GridBagLayout();

getContentPane().setLayout(layout);

addComponent(layout, operation, 0, 0, 4, 1);

addComponent(layout, numbers[1], 1, 0, 1, 1);

addComponent(layout, numbers[2], 1, 1, 1, 1);

addComponent(layout, numbers[3], 1, 2, 1, 1);

addComponent(layout, numbers[4], 2, 0, 1, 1);

addComponent(layout, numbers[5], 2, 1, 1, 1);

addComponent(layout, numbers[6], 2, 2, 1, 1);

addComponent(layout, numbers[7], 3, 0, 1, 1);

addComponent(layout, numbers[8], 3, 1, 1, 1);

addComponent(layout, numbers[9], 3, 2, 1, 1);

addComponent(layout, dot, 4, 0, 1, 1);

addComponent(layout, numbers[0], 4, 1, 1, 1);

addComponent(layout, sqrt, 4, 2, 1, 1);

addComponent(layout, plus, 1, 3, 1, 1);

addComponent(layout, minus, 2, 3, 1, 1);

addComponent(layout, multi, 3, 3, 1, 1);

addComponent(layout, div, 4, 3, 1, 1);

addComponent(layout, equal, 5, 0, 2, 1);

addComponent(layout, changePN, 5, 2, 1, 1);

addComponent(layout, clear, 5, 3, 1, 1);

}

// 对按钮进行反应的方法

public void actionPerformed(ActionEvent e) {

JButton btn = (JButton) e.getSource();

if (btn == clear) {

operation.setText("0");

dotExist = false;

storedNumber = 0;

lastOperator = '?';

} else if (btn == equal) {

operate('=');

equaled = true;

} else if (btn == plus) {

operate('+');

equaled = false;

} else if (btn == minus) {

operate('-');

equaled = false;

} else if (btn == multi) {

operate('*');

equaled = false;

} else if (btn == div) {

operate('/');

equaled = false;

} else if (btn == changePN) {

operate('p');

operate('=');

equaled = true;

} else if (btn == sqrt) {

operate('s');

operate('=');

equaled = true;

} else {

if (equaled)

storedNumber = 0;

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

if (btn == numbers[i]) {

if (operation.getText().equals("0"))

operation.setText("" + i);

else if (!operated)

operation.setText(operation.getText() + i);

else {

operation.setText("" + i);

operated = false;

}

}

if (btn == dot !dotExist) {

operation.setText(operation.getText() + ".");

dotExist = true;

}

}

}

// 进行运算的方法

private void operate(char operator) {

double currentNumber = Double.valueOf(operation.getText())

.doubleValue();

if (lastOperator == '?')

storedNumber = currentNumber;

else if (lastOperator == '+')

storedNumber += currentNumber;

else if (lastOperator == '-')

storedNumber -= currentNumber;

else if (lastOperator == '*')

storedNumber *= currentNumber;

else if (lastOperator == '/')

storedNumber /= currentNumber;

else if (lastOperator == 'p')

storedNumber *= -1;

else if (lastOperator == 's')

storedNumber = Math.sqrt(currentNumber);

else if (lastOperator == '=' equaled)

storedNumber = currentNumber;

operation.setText("" + storedNumber);

operated = true;

lastOperator = operator;

}

// 快捷使用GridBagLayout的方法

private void addComponent(GridBagLayout layout, Component component,

int row, int col, int width, int height) {

GridBagConstraints constraints = new GridBagConstraints();

constraints.fill = GridBagConstraints.BOTH;

constraints.insets = new Insets(10, 2, 10, 2);

constraints.weightx = 100;

constraints.weighty = 100;

constraints.gridx = col;

constraints.gridy = row;

constraints.gridwidth = width;

constraints.gridheight = height;

layout.setConstraints(component, constraints);

if (component instanceof JButton)

((JButton) component).addActionListener(this);

getContentPane().add(component);

}

// 主方法初始化并显示窗口

public static void main(String[] args) {

Calculator3 calc = new Calculator3();

calc.setSize(290, 400);

calc.setVisible(true);

}

}

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：