下面這個Java小程序應該怎么命名呢 純新手 不懂 只在書上看到了代碼 boy extends Applet.Java這樣不可以

應該命名為boy.java。。。。

堅守“ 做人真誠 · 做事靠譜 · 口碑至上 · 高效敬業(yè) ”的價值觀，專業(yè)網(wǎng)站建設服務10余年為成都成都木屋小微創(chuàng)業(yè)公司專業(yè)提供企業(yè)網(wǎng)站制作營銷網(wǎng)站建設商城網(wǎng)站建設手機網(wǎng)站建設小程序網(wǎng)站建設網(wǎng)站改版，從內(nèi)容策劃、視覺設計、底層架構(gòu)、網(wǎng)頁布局、功能開發(fā)迭代于一體的高端網(wǎng)站建設服務。

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

另外，類名建議首字母大寫

java 小程序源代碼

求素數(shù)，比較經(jīng)典的，下面是代碼及注釋

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

public class Sushu {

/**

* 判斷一個數(shù)是不是素數(shù)

* @param a 被判斷的數(shù)

* @return 是素數(shù)返回真

*/

public boolean isSuhu(int a){

boolean isSushu=true;

//根據(jù)素數(shù)的性質(zhì)判斷一個數(shù)是否為素數(shù)

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

if(a%i==0){

isSushu=false;

break;

}

}

return isSushu;

}

/**

* 判斷連續(xù)若干個數(shù)中那些是素數(shù)

* @param start 起始數(shù)

* @param end 終止數(shù)

*/

public void selectSushu(int start,int end){

//判斷一串數(shù)中那些為素數(shù)，并將結(jié)果打印出來

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);

}

}

誰能給個JAVA的小程序代碼，越小越好！

這是我曉得的最簡單的java小程序代碼了你可以看看:

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);

//創(chuàng)建驅(qū)動

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();

//重定向至查詢頁面

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簡單小程序，NAME:輸入名字，NUMBER:輸入學號，mark：輸入分數(shù)。直到輸入end結(jié)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("輸入姓名：");

String name=in.next();

System.out.print("輸入學號：");

String num = in.next();

System.out.print("輸入分數(shù)：");

double score = in.nextDouble();

i++;

sum+=score;

System.out.print("是否結(jié)束：(end/其它任意鍵)");

result = in.next();

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

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

System.out.println("輸出信息結(jié)果："+str+"\r\n");

System.out.println("平均分："+sum/i);

}

}

直接復制一下，就可以運行，看是不是你要的效果。（不過沒有對輸入的值做判斷，自己可以對輸入做一下判斷）

這個也可以用for循環(huán)來做

java做個小程序 100-200代碼就行了

我給你一個功能強大的計算器!已運行通過!

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Calculator3 extends JFrame implements ActionListener {

private boolean dotExist, operated, equaled; // 幫助運算的布爾變量

private double storedNumber; // 目前的結(jié)果

private char lastOperator; // 表示上一運算符

private JTextField operation; // 結(jié)果欄

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

private JButton[] numbers; // 數(shù)字

// 構(gòu)造者

public Calculator3() {

setTitle("Calculator");

// 初始化變量

dotExist = false; // 表示當前的數(shù)是否有小數(shù)點

operated = false; // 表示任意運算符是否被按下

equaled = false; // 表示等號是否被按下

storedNumber = 0;

lastOperator = '?';

// 初始化窗口變量

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");

// 將窗口物體放入窗口

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);

}

// 對按鈕進行反應的方法

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;

}

}

}

// 進行運算的方法

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);

}

// 主方法初始化并顯示窗口

public static void main(String[] args) {

Calculator3 calc = new Calculator3();

calc.setSize(290, 400);

calc.setVisible(true);

}

}

求java經(jīng)典小程序代碼

代碼如下：

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;

}

}

結(jié)果如下：

網(wǎng)頁題目：java點名小程序代碼 JAVA小程序代碼
標題網(wǎng)址：http://chinadenli.net/article24/hpiece.html

成都網(wǎng)站建設公司_創(chuàng)新互聯(lián)，為您提供商城網(wǎng)站、營銷型網(wǎng)站建設、品牌網(wǎng)站建設、外貿(mào)網(wǎng)站建設、全網(wǎng)營銷推廣、外貿(mào)建站

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時需注明來源： 創(chuàng)新互聯(lián)