java界面小程序代码 java编写小程序示例

求JAVA大神给我发一段完整可运行的java图形小程序的代码(不用太多类),谢谢了

/*计算器*/

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import java.awt.*;

import javax.swing.*;

import javax.swing.border.*;

import java.awt.event.*;

public class Calculator implements ActionListener{

JFrame frame;

JPanel panel;

JTextField tfShow;/*定义显示文本框*/

JButton b1[]=new JButton[10]; /*数字按钮*/

JButton b2[]=new JButton[6]; /*操作按钮*/

boolean isNumber;/*判断是否输入多位数字的变量*/

double number;/*存储输入数值、显示结果的变量*/

double result;/*存储中间运算结果的变量*/

char operator;/*存储当前操作符的成员变量*/

public Calculator(){

frame=new JFrame("计算器");

frame.setSize(300,300);/*指定框架窗口的大小*/

frame.setResizable(false);/*使框架窗口不可改变大小*/

JPanel contentPane=(JPanel)frame.getContentPane();

contentPane.setBorder(new EmptyBorder(20,20,20,20));/*绘制框架的指定大小的空透明边框*/

tfShow=new JTextField("0",25);/*指定属性的文本域*/

tfShow.setHorizontalAlignment(JTextField.RIGHT);/*设置文本域中文本的对齐方式*/

isNumber=true;/*初始值设置*/

number=0;/*初始值设置*/

result=0;/*初始值设置*/

operator=' ';/*初始值设置*/

for(int i=0;ib1.length;i++){

b1[i]=new JButton(Integer.toString(i));/*创建数字按钮*/

b1[i].setActionCommand(Integer.toString(i));

b1[i].addActionListener(this);

b1[i].setForeground(Color.blue);

}

String bs[]={"/","*","-","C","+","="};

for(int i=0;ib2.length;i++){

b2[i]=new JButton(bs[i]);/*创建操作按钮*/

b2[i].setActionCommand(bs[i]);

b2[i].addActionListener(this);

b2[i].setForeground(Color.red);

}

panel=new JPanel();

panel.setLayout(new GridLayout(4,5));

panel.add(b1[1]);

panel.add(b1[2]);

panel.add(b1[3]);

panel.add(b2[0]);

panel.add(b1[4]);

panel.add(b1[5]);

panel.add(b1[6]);

panel.add(b2[1]);

panel.add(b1[7]);

panel.add(b1[8]);

panel.add(b1[9]);

panel.add(b2[2]);

panel.add(b1[0]);

panel.add(b2[3]);

panel.add(b2[4]);

panel.add(b2[5]);

frame.add(tfShow,BorderLayout.NORTH);/*将文本框放置在框架上方*/

frame.add(panel,BorderLayout.CENTER);/*将装有按钮组的panel放在框架的中心*/

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);/*设置框架窗口的默认窗口关闭操作*/

frame.setVisible(true);/*设置框架可见*/

}

public double getDisplay(){/*返回要显示的结果*/

return number;

}

public void reDisplay(){/*刷新文本域的内容*/

tfShow.setText(""+getDisplay());

}

/*对输入数字的处理*/

public void numberProcess(int num){

if(isNumbernum!=0){

String s1=Integer.toString(num);

String s2=Integer.toString((int)(this.number));

this.number=Double.parseDouble(s2+s1);/*对多位数字的处理*/

}else{

this.number=num;

}

isNumber=true;/*输入连续数字(即多位数字)时为真*/

public void operationProcess(char operator){/*根据输入的操作符改变当前操作符*/

switch(operator){

case '-':

this.operator='-';

break;

case '+':

this.operator='+';

break;

case '*':

this.operator='*';

break;

case '/':

this.operator='/';

break;

}

result=number;

isNumber=false;/*输入操作符时表示输入连续数字的标记变量为假*/

public void clear(){

number=0;

result=0;

}  

public void equal(){/*计算运算结果*/

switch(operator){

case '-':

result=result-number;

break;

case '+':

result=result+number;

break;

case '*':

result=result*number;

break;

case '/':

result=result/number;

break;

case ' ':

result=number;

break;

}

number=result; /*把运算结果赋值给显示变量*/

isNumber=false;

operator=' '; 

public static void main(String args[]){

Calculator cal=new Calculator();/*创建计算器*/

}

public void actionPerformed(ActionEvent e){

String command=e.getActionCommand();/*获取按钮激发的操作事件的命令名称*/

char c=command.charAt(0);/*将按钮命令名称的第一个字符赋值给一个字符c*/

switch(c){

case '1':

case '2':

case '3':

case '4':

case '5':

case '6':

case '7':

case '8':

case '9':

case '0':

int number=Integer.parseInt(command);

numberProcess(number);/*输入数字的处理*/

break;

case '+':

case '-':

case '*':

case '/':

operationProcess(c);/*算数运算符的处理*/

break;

case '=':equal();break;/*计算运算结果*/

case 'C':clear();break;/*清零*/

}

reDisplay(); /*在文本域中显示信息*/

}

}

运行截图:

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:

如何用JAVA语言编写计算器小程序?

具体代码如下:

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();

}

}

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() {

}

}


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