如何用JAVA语言编写计算器小程序？

具体代码如下：

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import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class Calculator  extends JFrame implements ActionListener  {

private JFrame jf;

private JButton[] allButtons;

private JButton clearButton;

private JTextField jtf;

public Calculator() {

//对图形组件实例化

jf=new JFrame("任静的计算器1.0：JAVA版");

jf.addWindowListener(new WindowAdapter(){

public void windowClosing(){

System.exit(0);

}

});

allButtons=new JButton[16];

clearButton=new JButton("清除");

jtf=new JTextField(25);

jtf.setEditable(false);

String str="123+456-789*0.=/";

for(int i=0;iallButtons.length;i++){

allButtons[i]=new JButton(str.substring(i,i+1));

}

}

public void init(){

//完成布局

jf.setLayout(new BorderLayout());

JPanel northPanel=new JPanel();

JPanel centerPanel=new JPanel();

JPanel southPanel=new JPanel();

northPanel.setLayout(new FlowLayout());

centerPanel.setLayout(new GridLayout(4,4));

southPanel.setLayout(new FlowLayout());

northPanel.add(jtf);

for(int i=0;i16;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

jf.add(northPanel,BorderLayout.NORTH);

jf.add(centerPanel,BorderLayout.CENTER);

jf.add(southPanel,BorderLayout.SOUTH);

addEventHandler();

}

//添加事件监听

public void addEventHandler(){

jtf.addActionListener(this);

for(int i=0;iallButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

Calculator.this.jtf.setText("");

}

});

}

//事件处理

public void actionPerformed(ActionEvent e) {

//在这里完成事件处理  使计算器可以运行

String action=e.getActionCommand();

if(action=="+"||action=="-"||action=="*"||action=="/"){

}

}

public void setFontAndColor(){

Font f=new Font("宋体",Font.BOLD,24);

jtf.setFont(f);

jtf.setBackground(new Color(0x8f,0xa0,0xfb));

for(int i=0;i16;i++){

allButtons[i].setFont(f);

allButtons[i].setForeground(Color.RED);

}

}

public void showMe(){

init();

setFontAndColor();

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args){

new Calculator().showMe();

}

}

java小程序源代码，简单点的，100多行，谁有啊？？

// My car shop.java

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;

public class carshop extends JFrame

{

// JPanel to hold all pictures

private JPanel windowJPanel;

private String[] cars = { "","阿斯顿马丁", "美洲虎", "凯迪拉克",

"罗孚", "劳斯莱斯","别克"};

private int[] jiage = { 0,150000, 260000, 230000,

140000, 290000, 150000};

// JLabels for first snack shown

private JLabel oneJLabel;

private JLabel oneIconJLabel;

// JLabels for second snack shown

private JLabel twoJLabel;

private JLabel twoIconJLabel;

// JLabels for third snack shown

private JLabel threeJLabel;

private JLabel threeIconJLabel;

// JLabels for fourth snack shown

private JLabel fourJLabel;

private JLabel fourIconJLabel;

// JLabels for fifth snack shown

private JLabel fiveJLabel;

private JLabel fiveIconJLabel;

// JLabels for sixth snack shown

private JLabel sixJLabel;

private JLabel sixIconJLabel;

// JTextField for displaying snack price

private JTextArea displayJTextArea;

// JLabel and JTextField for user input

private JLabel inputJLabel;

private JComboBox selectCountryJComboBox;

private JLabel inputJLabel2;

private JTextField inputJTextField2;

// JButton to enter user input

private JButton enterJButton;

//JButton to clear the components

private JButton clearJButton;

// no-argument constructor

public carshop()

{

createUserInterface();

}

// create and position GUI components; register event handlers

private void createUserInterface()

{

// get content pane for attaching GUI components

Container contentPane = getContentPane();

// enable explicit positioning of GUI components

contentPane.setLayout( null );

// set up windowJPanel

windowJPanel = new JPanel();

windowJPanel.setBounds( 10, 20, 340, 200 );

windowJPanel.setBorder( new LineBorder( Color.BLACK ) );

windowJPanel.setLayout( null );

contentPane.add( windowJPanel );

// set up oneIconJLabel

oneIconJLabel = new JLabel();

oneIconJLabel.setBounds( 10, 20, 100, 65 );

oneIconJLabel.setIcon( new ImageIcon( "images/阿斯顿马丁.jpg" ) );

windowJPanel.add( oneIconJLabel );

// set up oneJLabel

oneJLabel = new JLabel();

oneJLabel.setBounds( 10, 60, 100, 70 );

oneJLabel.setText( "阿斯顿马丁" );

oneJLabel.setHorizontalAlignment( JLabel.CENTER );

windowJPanel.add( oneJLabel );

// set up twoIconJLabel

twoIconJLabel = new JLabel();

twoIconJLabel.setBounds( 120, 20, 100, 65 );

twoIconJLabel.setIcon( new ImageIcon( "images/美洲虎.jpg" ) );

windowJPanel.add( twoIconJLabel );

// set up twoJLabel

twoJLabel = new JLabel();

twoJLabel.setBounds( 110, 60, 100, 70 );

twoJLabel.setText( "美洲虎" );

twoJLabel.setHorizontalAlignment( JLabel.CENTER );

windowJPanel.add( twoJLabel );

// set up threeIconJLabel

threeIconJLabel = new JLabel();

threeIconJLabel.setBounds( 230, 20, 100, 65 );

threeIconJLabel.setIcon( new ImageIcon(

"images/凯迪拉克.jpg" ) );

windowJPanel.add( threeIconJLabel );

// set up threeJLabel

threeJLabel = new JLabel();

threeJLabel.setBounds( 230, 60, 100, 70);

threeJLabel.setText( "凯迪拉克" );

threeJLabel.setHorizontalAlignment( JLabel.CENTER );

windowJPanel.add( threeJLabel );

// set up fourIconJLabel

fourIconJLabel = new JLabel();

fourIconJLabel.setBounds( 10, 100, 100, 65 );

fourIconJLabel.setIcon( new ImageIcon( "images/罗孚.jpg" ) );

windowJPanel.add( fourIconJLabel );

// set up fourJLabel

fourJLabel = new JLabel();

fourJLabel.setBounds( 10, 150, 50, 70 );

fourJLabel.setText( "罗孚" );

fourJLabel.setHorizontalAlignment( JLabel.CENTER );

windowJPanel.add( fourJLabel );

// set up fiveIconJLabel

fiveIconJLabel = new JLabel();

fiveIconJLabel.setBounds( 120, 100, 100, 65 );

fiveIconJLabel.setIcon( new ImageIcon(

"images/劳斯莱斯.jpg" ) );

windowJPanel.add( fiveIconJLabel );

// set up fiveJLabel

fiveJLabel = new JLabel();

fiveJLabel.setBounds( 110, 150, 100, 70 );

fiveJLabel.setText( "劳斯莱斯" );

fiveJLabel.setHorizontalAlignment( JLabel.CENTER );

windowJPanel.add( fiveJLabel );

// set up sixIconJLabel

sixIconJLabel = new JLabel();

sixIconJLabel.setBounds( 230, 100, 100, 65 );

sixIconJLabel.setIcon( new ImageIcon( "images/别克.jpg" ) );

windowJPanel.add( sixIconJLabel );

// set up sixJLabel

sixJLabel = new JLabel();

sixJLabel.setBounds( 230, 150, 100, 70 );

sixJLabel.setText( "别克" );

sixJLabel.setHorizontalAlignment( JLabel.CENTER );

windowJPanel.add( sixJLabel );

// set up enterJButton

enterJButton = new JButton();

enterJButton.setBounds( 390, 160, 135, 30 );

enterJButton.setText( "Enter" );

contentPane.add( enterJButton );

enterJButton.addActionListener(

new ActionListener() // anonymous inner class

{

// event handler called when enterJButton is clicked

public void actionPerformed( ActionEvent event )

{

enterJButtonActionPerformed( event );

}

} // end anonymous inner class

); // end call to addActionListener

// set up clearJButton

clearJButton = new JButton();

clearJButton.setBounds( 390, 200, 135, 30 );

clearJButton.setText( "Clear" );

contentPane.add( clearJButton );

// set up inputJLabel

inputJLabel = new JLabel();

inputJLabel.setBounds( 390, 25, 135, 25 );

inputJLabel.setText( "Please make selection:" );

contentPane.add( inputJLabel );

selectCountryJComboBox = new JComboBox( cars );

selectCountryJComboBox.setBounds( 390, 50, 135, 21 );

selectCountryJComboBox.setMaximumRowCount( 3 );

contentPane.add( selectCountryJComboBox );

// set up inputJTextField

inputJLabel2 = new JLabel();

inputJLabel2.setBounds( 390, 80, 150, 20 );

inputJLabel2.setText( "Input the Numble:" );

contentPane.add( inputJLabel2 );

// set up inputJTextField

inputJTextField2 = new JTextField();

inputJTextField2.setBounds( 390, 100, 135, 25 );

inputJTextField2.setHorizontalAlignment( JTextField.RIGHT );

contentPane.add( inputJTextField2 );

clearJButton.addActionListener(

new ActionListener() // anonymous inner class

{

// event handler called when clearJButton is clicked

public void actionPerformed( ActionEvent event )

{

clearJButtonActionPerformed( event );

}

} // end anonymous inner class

);

// set up displayJTextField

displayJTextArea = new JTextArea();

displayJTextArea.setBounds( 10, 237,515, 70 );

displayJTextArea.setEditable( false );

contentPane.add( displayJTextArea );

// set properties of application's window

setTitle( "My car Shop" ); // set title bar string

setSize( 550, 360 ); // set window size

setVisible( true ); // display window

} // end method createUserInterface

private void clearJButtonActionPerformed( ActionEvent event )

{

// clear the JTextFields

inputJTextField2.setText( "" );

displayJTextArea.setText("");

} // end method clearJButtonActionPerformed

private void enterJButtonActionPerformed( ActionEvent event )

{

double z;

double c;

int x;

int y;

x=selectCountryJComboBox.getSelectedIndex();

y=Integer.parseInt(inputJTextField2.getText());

double discountRate;

int amount = Integer.parseInt( inputJTextField2.getText());

switch (amount/5)

{

case 0:

discountRate = 0;

break;

case 1:

discountRate = 1;

break;

case 2:

discountRate = 2;

break;

case 3:

discountRate = 3;

break;

default:

discountRate = 4;

} // end switch statement

c=1-discountRate/100;

z=jiage[x]*y*c;

displayJTextArea.append("你选择的是："+cars[x]+"；"+

"它的单价是："+jiage[x]+"；" +"你购买该产品的数量是："+y+"，" +"\n"+"该数量的折扣是："

+discountRate + " %"+"；"+"本次消费的总价格是："+z+"元"+"!"+"\n");

}

public static void main( String args[] )

{

carshop application = new carshop();

application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

} // end method main

} // end class carshop

小程序后台获取openId解密的java代码怎么写

一、获取code

将code作为参数传递过来

//如果有code，说明是微信小程序，根据code获取openId

//classify用于标识是哪个小程序

if (!CheckUtil.checkNulls( keUser.getCode(),keUser.getClassify())){

//

String openid = OpenIdUtil.oauth2GetOpenid(keUser.getCode(),keUser.getClassify());

printParamsLog(openid, logger);

keUser.setUserId(openid);

}1234567812345678

二、工具类

package com.util;

import net.sf.json.JSONObject;

import org.apache.http.client.HttpClient;

import org.apache.http.client.ResponseHandler;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.BasicResponseHandler;

import org.apache.http.impl.client.DefaultHttpClient;

import java.util.HashMap;

import java.util.Map;

/**

* @author xsx

*/

public class OpenIdUtil {

public static String oauth2GetOpenid(String code,String classify) {

String appid="";

String appsecret="";

switch (classify){

case "1":

//自己的配置appid

appid = "**********";

//自己的配置APPSECRET;

appsecret = "**********";

break;

case "2":

appid = "**********";

appsecret = "************";

break;

case "3":

appid = "**********";

appsecret = "************";

break;

case "4":

appid = "**********";

appsecret = "************";

break;

case "5":

appid = "**********";

appsecret = "************";

}

//授权（必填）

String grant_type = "authorization_code";

//URL

String requestUrl = "";

//请求参数

String params = "appid=" + appid + "secret=" + appsecret + "js_code=" + code + "grant_type=" + grant_type;

//发送请求

String data = HttpUtil.get(requestUrl, params);

//解析相应内容（转换成json对象）

JSONObject json = JSONObject.fromObject(data);

//用户的唯一标识（openid）

String Openid =String.valueOf(json.get("openid"));

//System.out.println(Openid);

return Openid;

}

}

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960

三、发送请求的工具类

package com.util;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

/**

* @author xsx

*/

public class HttpUtil {

/**

* 向指定URL发送GET方法的请求

*

* @param url

* 发送请求的URL

* @param param

* 请求参数，请求参数应该是 name1=value1name2=value2 的形式。

* @return String 所代表远程资源的响应结果

*/

public static String get(String url,String param){

String result = "";

BufferedReader in = null;

try {

String urlNameString = url + "?" + param;

//System.out.println(urlNameString);

URL realUrl = new URL(urlNameString);

// 打开和URL之间的连接

URLConnection connection = realUrl.openConnection();

// 设置通用的请求属性

connection.setRequestProperty("accept", "*/*");

connection.setRequestProperty("connection", "Keep-Alive");

connection.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

// 建立实际的连接

connection.connect();

// 获取所有响应头字段

MapString, ListString map = connection.getHeaderFields();

// 遍历所有的响应头字段

/*for (String key : map.keySet()) {

System.out.println(key + "---" + map.get(key));

}*/

// 定义 BufferedReader输入流来读取URL的响应

in = new BufferedReader(new InputStreamReader(

connection.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

System.out.println("发送GET请求出现异常！" + e);

e.printStackTrace();

}

// 使用finally块来关闭输入流

finally {

try {

if (in != null) {

in.close();

}

} catch (Exception e2) {

e2.printStackTrace();

}

}

return result;

}

}

想编写一个简单的java小程序运行在手机上 代码怎么实现

首先配置环境 配置好J2ME环境

–安装EclipseME插件

–配置EclipseME插件

–加载WTK

使用Eclipse进行JAVAME程序开发

最后你的手机要能运行java程序

ps：不建议学习JAVA手机开发，应用范围不广，手机开发一般都是嵌入式开发一类，JAVA开发还是侧重于网络开发

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