如何用Java编写一个绘制图形的小程序？

import java.awt.*;

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import java.awt.event.*;

import java.awt.geom.*;

import javax.swing.*;

//不规则图形的绘制

public class IrregularShapeDemo extends JFrame {

GeneralPath gPath= new GeneralPath(); //GeneralPath对象实例

Point aPoint;

//构造函数

public IrregularShapeDemo() {

super("不规则图形的绘制"); //调用父类构造函数

enableEvents(AWTEvent.MOUSE_EVENT_MASK|AWTEvent.MOUSE_MOTION_EVENT_MASK); //允许事件

setSize(300, 200); //设置窗口尺寸

setVisible(true); //设置窗口可视

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序

}

public void paint(Graphics g) { //重载窗口组件的paint()方法

Graphics2D g2D = (Graphics2D)g; //获取图形环境

g2D.draw(gPath); //绘制路径

}

public static void main(String[] args) {

new IrregularShapeDemo();

}

protected void processMouseEvent(MouseEvent e) { //鼠标事件处理

if(e.getID() == MouseEvent.MOUSE_PRESSED) {

aPoint = e.getPoint(); //得到当前鼠标点

gPath = new GeneralPath(); //重新实例化GeneralPath对象

gPath.moveTo(aPoint.x,aPoint.y); //设置路径点

}

}

protected void processMouseMotionEvent(MouseEvent e) { //鼠标运动事件处理

if(e.getID() == MouseEvent.MOUSE_DRAGGED) {

aPoint = e.getPoint(); //得到当前鼠标点

gPath.lineTo(aPoint.x, aPoint.y); //设置路径

gPath.moveTo(aPoint.x, aPoint.y);

repaint(); //重绘组件

}

}

}

用java编写一个图形化界面小程序，swing窗体定义4个标签对象，分别是：用户名、输入料号、扫描条码等。

用java编写一个图形化界面小程序，swing窗体定义4个标签对象，分别是：用户名、输入料号数量、扫描条码等。另外定义两个按钮对象（确定、取消）

上面这些你肯定会的

至于

用户点击确定按钮功能之后把以上数据（用户名、料号数量、条码、还有用户操作日期）统计在excel表中

如果本地测试的话，就新建一个excel，可以搜索相关java操作excel的代码，有jxl和poi，

首先查找设定的excel名字，如果没有创建一个；

还可以保存到数据库，提供实时导出excel

求一个简单的Java 小程序源文件！高分悬赏！

给你个计算器的，

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.text.DecimalFormat;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Calculator {

//计算器面板

private JFrame f = new JFrame("Calculator");

//输入面扳

private JPanel inputPanel = new JPanel();

//加减乘除面板

private JPanel operationPanel = new JPanel();

//数字面板

private JPanel buttonsPanel = new JPanel();

//输入数据文本框

private JTextField input = new JTextField(20);

//退格键

private JButton backspace = new JButton("BackSpace");

//清空

private JButton CE = new JButton("CE ");

//删除

private JButton C = new JButton("C ");

//四则运算符号键

private JButton add = new JButton("+");

private JButton sub = new JButton("-");

private JButton mul = new JButton("*");

private JButton div = new JButton("/");

//小数点

private JButton decimal = new JButton(".");

//等号

private JButton equal = new JButton("=");

//数字键

private JButton zero = new JButton("0");

private JButton one = new JButton("1");

private JButton two = new JButton("2");

private JButton three = new JButton("3");

private JButton four = new JButton("4");

private JButton five = new JButton("5");

private JButton six = new JButton("6");

private JButton seven = new JButton("7");

private JButton eight = new JButton("8");

private JButton nine = new JButton("9");

private String num1 = "";//保存第一个运算数字

private String operator = "";//保存运算符号

public static void main(String[] args) {

new Calculator();//new计算器实例

}

public Calculator(){

//添加组件，布局

inputPanel.add(input);

f.add(inputPanel, BorderLayout.NORTH);

operationPanel.add(backspace);

operationPanel.add(CE);

operationPanel.add(C);

f.add(operationPanel, BorderLayout.CENTER);

buttonsPanel.add(add);

buttonsPanel.add(sub);

buttonsPanel.add(mul);

buttonsPanel.add(div);

buttonsPanel.add(one);

buttonsPanel.add(two);

buttonsPanel.add(three);

buttonsPanel.add(zero);

buttonsPanel.add(four);

buttonsPanel.add(five);

buttonsPanel.add(six);

buttonsPanel.add(decimal);

buttonsPanel.add(seven);

buttonsPanel.add(eight);

buttonsPanel.add(nine);

buttonsPanel.add(equal);

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

f.add(buttonsPanel, BorderLayout.SOUTH);

//注册各个组件监听事件

backspace.addMouseListener(new OperationMouseListener());

CE.addMouseListener(new OperationMouseListener());

C.addMouseListener(new OperationMouseListener());

decimal.addMouseListener(new OperationMouseListener());

equal.addMouseListener(new OperationMouseListener());

//注册四则运算监听

add.addMouseListener(new CalcMouseListener());

sub.addMouseListener(new CalcMouseListener());

mul.addMouseListener(new CalcMouseListener());

div.addMouseListener(new CalcMouseListener());

//注册数字监听事件

zero.addMouseListener(new NumberMouseListener());

one.addMouseListener(new NumberMouseListener());

two.addMouseListener(new NumberMouseListener());

three.addMouseListener(new NumberMouseListener());

four.addMouseListener(new NumberMouseListener());

five.addMouseListener(new NumberMouseListener());

six.addMouseListener(new NumberMouseListener());

seven.addMouseListener(new NumberMouseListener());

eight.addMouseListener(new NumberMouseListener());

nine.addMouseListener(new NumberMouseListener());

f.setVisible(true);

f.pack();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private class NumberMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {

if(input.getText().trim().equals("0")){//如果文本框已经是0，结果还是0

input.setText(((JButton)e.getSource()).getText().trim());

}else{//否则的话，把0添加到后面，譬如文本框是1，结果就为10

input.setText(input.getText().concat(((JButton)e.getSource()).getText().trim()));

}

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

private class CalcMouseListener implements MouseListener{

//如果输入的是运算符号，保存第一个结果和运算符号

public void mouseClicked(MouseEvent e) {

num1 = input.getText().trim();input.setText("");

operator = ((JButton)e.getSource()).getText().trim();

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

private class OperationMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {

if(e.getSource() == backspace){//退格键，删除一个直到没有字符删除

String inputText = input.getText();

if(inputText.length() 0){

input.setText(inputText.substring(0, inputText.length() - 1));

}

}else if(e.getSource() == C){

input.setText("0");//C，清空所有运算数字和符号

num1 = "";

}else if(e.getSource() == CE){

input.setText("0");//CE--将文本框置为0

}else if(e.getSource() == decimal){

String text = input.getText().trim();

//如果按了小数点，如果文本框已经有小数点，不做任何操作，否则在结果后面加上小数点

if(text.indexOf(".") == -1){

input.setText(text.concat("."));

}

}else if(e.getSource() == equal){

//如果是等号

if(!operator.trim().equals("")){

if(!input.getText().trim().equals("")){

double result = 0D;

if(operator.equals("+")){//执行加法运算

result = Double.parseDouble(num1) + Double.parseDouble(input.getText().trim());

}else if(operator.equals("-")){//减法运算

result = Double.parseDouble(num1) - Double.parseDouble(input.getText().trim());

}else if(operator.equals("*")){//乘法运算

result = Double.parseDouble(num1) * Double.parseDouble(input.getText().trim());

}else if(operator.equals("/")){//除法运算

result = Double.parseDouble(num1) / Double.parseDouble(input.getText().trim());

}

//格式化最终结果，保留两位小数点

input.setText(new DecimalFormat("0.00").format(result));

}

}

}

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

}

用java的图形界面设计写一个小程序，题目要求如下，在线等。。急急急、、、

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class test extends JFrame { private static final long serialVersionUID = 1L;

public static void main(String args[]) {

test frame = new test();

frame.setVisible(true);

}

public test() {

super();

getContentPane().setLayout(null);

setBounds(100, 100, 236, 193);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JLabel label = new JLabel();

label.setText("0");

label.setBounds(62, 33, 79, 18);

getContentPane().add(label);

final JButton button = new JButton();

button.addActionListener(new ActionListener() {

public void actionPerformed(final ActionEvent e) {

label.setText(String.valueOf((Integer.valueOf(label.getText())+1)));

}

});

button.setText("点击");

button.setBounds(50, 93, 106, 28);

getContentPane().add(button);

}

}

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*/

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：

求一个java applet小程序的源代码

import java.applet.Applet;

import java.awt.Button;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.TextField;

import java.awt.event.ActionEvent;

public class Nicki extends Applet{

private static final long serialVersionUID = 1L;

private Button ok;

private int num=32;

private int resu=0;

private boolean isRig=false;

private TextField iPut;

public Nicki(){

this.setLayout(null);

ok=new Button("OK");

ok.setActionCommand(getName());

ok.setBounds(150, 150, 40, 20);

iPut=new TextField();

this.add(iPut);

iPut.setBounds(100, 150, 40, 20);

this.add(ok);

ok.addActionListener(new ButtonAction(this));

}

public void paint(Graphics g){

g.setColor(Color.white);

g.fillRect(0, 0, this.getWidth(), this.getHeight());

g.setColor(Color.BLACK);

g.drawString("Please guess a number ", 10, 20);

g.drawString("between 1 and 100", 10, 40);

if(isRig==falseresu!=0){

if(resunum){

g.drawString(""+resu+" is too big !", 10, 100);

}else if(resunum){

g.drawString(resu+"is too small !", 10, 100);

}

}else if(isRig==true){

g.setColor(Color.GREEN);

g.drawString("Yes,"+resu+" is the right number", 10, 80);

g.drawString("Your are great! ", 10, 100);

g.setColor(Color.red);

g.drawString(resu+"!", 70, 120);

}

iPut.setText("");

g.drawString("Input the number：", 0, 150);

}

public void ButtonActionPerformed(ActionEvent e){

if(e.getActionCommand().equals("panel0")){

resu=Integer.parseInt(iPut.getText());

if(num==resu){

isRig=true;

}else{

isRig=false;

}

repaint();

}

}

}

class ButtonAction implements java.awt.event.ActionListener{

Nicki su;

public ButtonAction(Nicki bun){

this.su=bun;

}

public void actionPerformed(ActionEvent e) {

su.ButtonActionPerformed(e);

}

}