1. 测试java.swing包提供的轻量级组件的例子（以java Application方式运行）
TestSwing.java文件
源代码如下：
package SampleGUI;
import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.table.*;
import javax.swing.ButtonGroup;public class TestSwing extends JFrame{
JLabel lblName = new JLabel("姓名： ");
JLabel lblNumber = new JLabel("身份证号");
JLabel lblSex = new JLabel("性别 ");
JLabel lblJob = new JLabel("职业");
JLabel lblText = new JLabel("个性化宣言"); JTextField tfName = new JTextField(23);
JTextField tfNumber = new JTextField(20);
JTextArea taText = new JTextArea(5, 20);
JRadioButton jMale = new JRadioButton("男");
JRadioButton jFemale = new JRadioButton("女");
ButtonGroup group = new ButtonGroup();
JComboBox combJob = new JComboBox();
JButton btnOK = new JButton("确定");
JButton btnDisplay = new JButton("取消");
JTable tblInf = new JTable();
DefaultTableModel dtm = new DefaultTableModel();
JTree tree = new JTree();
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
JPanel p4 = new JPanel();
JPanel p5 = new JPanel();
JPanel p6 = new JPanel();
JPanel p7 = new JPanel(new BorderLayout());
JPanel p8 = new JPanel();
JPanel p9 = new JPanel(new BorderLayout());
public TestSwing(){
group.add(jMale);
group.add(jFemale);
combJob.addItem("计算机");
combJob.addItem("医生");
combJob.addItem("教师");
combJob.addItem("军队");
p1.add(lblName);
p1.add(tfName);
p2.add(lblNumber);
p2.add(tfNumber);
p3.add(lblSex);
p3.add(jMale);
p3.add(jFemale);
p4.add(lblJob);
p4.add(combJob);
p5.add(p3);
p5.add(p4);
p6.setLayout(new BorderLayout());
p6.add(p1, BorderLayout.NORTH);
p6.add(p2, BorderLayout.CENTER);
p6.add(p5, BorderLayout.SOUTH);
p7.add(lblText, BorderLayout.NORTH);
p7.add(taText, BorderLayout.CENTER);
p8.setLayout(new FlowLayout(FlowLayout.CENTER,30, 10));
p8.add(btnOK);
p8.add(btnDisplay);
p9.add(p6, BorderLayout.NORTH);
p9.add(p7, BorderLayout.CENTER);
p9.add(p8, BorderLayout.SOUTH);
add(p9);
setTable();
setTree();
getContentPane().add(p9, BorderLayout.NORTH);
JScrollPane s = new JScrollPane(tblInf);
getContentPane().add(s, BorderLayout.CENTER);
getContentPane().add(tree, BorderLayout.SOUTH);
}
public void setTable(){
Vector vCdata = new Vector();
vCdata.add("姓名");
vCdata.add("身份证号");
vCdata.add("性别");
tblInf.setModel(dtm);
for (int i = 0; i < vCdata.size(); i++) {
dtm.addColumn((String)vCdata.elementAt(i));
Vector vRdata = new Vector();
vRdata.add("王飞");
vRdata.add("430423199810249658");
vRdata.add("男");
dtm.addRow(vRdata);
}
}
public void setTree(){
DefaultMutableTreeNode root;
DefaultMutableTreeNode NodeName, NodeNumber, NodeSex;
DefaultMutableTreeNode leafName, leafNumber, leafSex;
root = new DefaultMutableTreeNode("个人信息");
NodeName = new DefaultMutableTreeNode("姓名");
leafName = new DefaultMutableTreeNode("王飞");
NodeNumber = new DefaultMutableTreeNode("身份证号");
leafNumber = new DefaultMutableTreeNode("430423199810249658");
NodeSex = new DefaultMutableTreeNode("性别");
leafSex = new DefaultMutableTreeNode("男");
root.add(NodeName);
root.add(NodeNumber);
root.add(NodeSex);
NodeName.add(leafName);
NodeNumber.add(leafNumber);
NodeSex.add(leafSex);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
tree.setEditable(false);
tree.setModel(new DefaultTreeModel(root));
}
public static void main(String []args){
TestSwing st = new TestSwing();
st.setSize(400, 450);
st.show();
}
}2. 界面布局的简单例子 （以java Applet方式运行）
UserPanel.java文件
源代码如下：
package SampleGUI;
import java.applet.*;
import java.awt.*;
import java.applet.Applet;public class UserPanel extends Applet{
Label lblName, lblNumber, lblSex, lblJob, lblText;
TextField tfName, tfNumber;
Checkbox chMale, chFemale;
CheckboxGroup c;
TextArea taText;
Choice chJob;
Button btnOK, btnCancel;
Panel p1, p2, p3, p4, p5, p6, p7, p8, p9;
public void init(){
lblName = new Label("姓名：");
lblNumber = new Label("身份证号： ");
lblSex = new Label("性别： ");
lblJob = new Label("职业： ");
lblText = new Label("修改化宣言： ");
tfName = new TextField(23);
tfNumber = new TextField(20);
taText = new TextArea(10, 20);
c = new CheckboxGroup();
chMale = new Checkbox("男", c, true);
chFemale = new Checkbox("女", c, false);
chJob = new Choice();
chJob.add("计算机");
chJob.add("医生");
chJob.add("教师");
chJob.add("军队"); btnOK = new Button("确定 ");
btnCancel = new Button("取消");
p1 = new Panel();
p2 = new Panel();
p3 = new Panel();
p4 = new Panel();
p5 = new Panel();
p6 = new Panel();
p7 = new Panel(new BorderLayout());
p8 = new Panel();
p9 = new Panel(new BorderLayout());
p1.add(lblName);
p1.add(tfName);
p2.add(lblNumber);
p2.add(tfNumber);
p3.add(lblSex);
p3.add(chMale);
p3.add(chFemale);
p4.add(lblJob);
p4.add(chJob);
p5.add(p3);
p5.add(p4);
p6.setLayout(new BorderLayout());
p6.add(p1, BorderLayout.NORTH);
p6.add(p2, BorderLayout.CENTER);
p6.add(p5, BorderLayout.SOUTH);
p7.add(lblText, BorderLayout.NORTH);
p7.add(taText, BorderLayout.CENTER);
p8.setLayout(new FlowLayout(FlowLayout.CENTER,30, 10));
p8.add(btnOK);
p8.add(btnCancel);
p9.add(p6, BorderLayout.NORTH);
p9.add(p7, BorderLayout.CENTER);
p9.add(p8, BorderLayout.SOUTH);
add(p9);
}
public void start(){
repaint();
}
}
3.用户图形界面例子
SampleGUI.java文件
package SampleGUI;
import java.awt.*;
import java.applet.*;public class SampleGUI extends Applet{
Image samImage;
public void init(){
samImage = getImage(getDocumentBase(), "Hydrangeas.jpg");
}
public void paint(Graphics g){
//g.clipRect(50, 50, 180, 180);
g.drawLine(0, 0, 20, 30);
g.drawString("图形显示", 100, 30);
Color c = new Color(255,200,0);
g.setColor(c);
Font f = new Font("TimesRoman",Font.BOLD+Font.ITALIC, 24);
g.setFont(f);
g.drawString("图形显示", 180 , 30);
g.drawLine(20, 20, 100, 50);
g.drawLine(20, 20, 50, 100);
g.drawRect(40, 40, 40, 40);
g.fillRect(60, 60, 40, 40);
g.setColor(Color.red);
g.draw3DRect(80, 80, 40, 40, true);
g.draw3DRect(100, 100, 40, 40, false);
g.fill3DRect(120, 120, 40, 40, true);
g.drawOval(150, 150, 30, 40);
g.fillOval(170, 170, 20, 20);
g.setColor(Color.blue);
g.drawRoundRect(180, 180, 40, 40, 20, 20);
g.fillRoundRect(200, 200, 40, 40, 20, 20);
int xC[] = {242,260,254,297,242};
int yC[] = {240,243,290,300,270};
g.drawPolygon(xC, yC, 5);
g.drawImage(samImage, 250,50,this);
}
}
5.测试选择事件例子
UserItemEvent.java
package SampleGUI;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;public class UserItemEvent extends Applet implements ItemListener{
Checkbox cDisp;
Button btnDisp;
Choice cFont;
public void init(){
cDisp = new Checkbox("红色");
btnDisp = new Button("颜色显示");
cFont = new Choice();
cFont.add("10");
cFont.add("12");
cFont.add("14");
cDisp.addItemListener(this);
cFont.addItemListener(this);
add(cDisp);
add(cFont);
add(btnDisp);
}
public void itemStateChanged(ItemEvent e){
Checkbox temp;
Choice temp2;
Font oldF;
if (e.getItemSelectable()instanceof Checkbox) {
temp = (Checkbox)(e.getItemSelectable());
if (temp.getState()) {
btnDisp.setBackground(Color.red);
}else{
btnDisp.setBackground(Color.blue);
}
}
if (e.getItemSelectable()instanceof Choice) {
oldF = btnDisp.getFont();
temp2 = (Choice)(e.getItemSelectable());
String s = temp2.getSelectedItem();
btnDisp.setFont(new Font(oldF.getName(), oldF.getStyle(), Integer.parseInt(s)));
}
}
}
6.测试文本事件例子
UserTextEvent.java
package SampleGUI;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;public class UserTextEvent extends Applet implements
ActionListener, TextListener{
TextField tOld;
TextArea tNew;
Panel p;
public void init(){
tOld = new TextField(25);
tNew = new TextArea(8, 25);
tOld.addActionListener(this);
tOld.addTextListener(this);
p = new Panel(new BorderLayout());
p.add(tOld, BorderLayout.NORTH);
p.add(tNew, BorderLayout.SOUTH);
add(p);
}
public void textValueChanged(TextEvent e){
if (e.getSource() == tOld) {
tNew.setText(tOld.getText());
}
}
public void actionPerformed(ActionEvent e){
if (e.getSource() == tOld) {
tNew.setText("");
}
}
}7.测试动作事件例子
UserButton.java
package SampleGUI;
import java.applet.*;
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;public class UserButton extends Applet implements ActionListener{
String str1 = new String();
String strContent = new String();
Button b1;
Button b2;
boolean Is1 = false;
boolean Is2 = false;
Color c;
public void init(){
b1 = new Button();
b2 = new Button("按钮对象2");
this.add(b1);
this.add(b2);
b1.addActionListener(this);
b2.addActionListener(this);
}
public void start(){
b1.setLabel("按钮对象1");
str1 = b2.getLabel();
repaint();
}
public void paint(Graphics g){
g.drawString(str1, 120, 130);
g.drawString(strContent, 120, 200);
}
public void actionPerformed(ActionEvent e){
String arg = e.getActionCommand();
if ("按钮对象1" == arg) {
c = Color.red;
strContent = "按钮对象1";
}else if ("按钮对象2" == arg) {
c = Color.blue;
strContent = "按钮对象2";
}
repaint();
}
}8.测试调整事件例子
UserAdjustmentEvent.java
package SampleGUI;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;public class UserAdjustmentEvent extends Applet implements AdjustmentListener{
Scrollbar s;
TextArea txtValue;
Panel p;
public void init(){
s = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 10, 36);
s.addAdjustmentListener(this);
txtValue = new TextArea(5,25);
p = new Panel(new BorderLayout());
p.add(s, BorderLayout.NORTH);
p.add((txtValue), BorderLayout.SOUTH);
add(p);
}
public void start(){
}
public void adjustmentValueChanged(AdjustmentEvent e){
int value;
Font oldF;
if (e.getAdjustable() == s) {
value = e.getValue();
txtValue.setText(new Integer(value).toString());
oldF = txtValue.getFont();
txtValue.setFont(new Font(oldF.getName(), oldF.getStyle(), value));
}
}
}9.测试按钮和画布的鼠标事件例子
UserMouseEvent.java
package SampleGUI;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;public class UserMouseEvent extends Applet implements MouseListener, MouseMotionListener{
Button btn;
public void init(){
btn = new Button("演示鼠标事件");
add(btn);
// 给按钮添加鼠标事件和鼠标移动事件
btn.addMouseListener(this);
btn.addMouseMotionListener(this);
//给画布添加鼠标事件和鼠标移动事件
this.addMouseListener(this);
this.addMouseMotionListener(this);
}
public void mouseClicked(MouseEvent e){
Point p = new Point();
if (e.getSource() == btn) {
if (e.getClickCount() == 1) {
btn.setLabel("单击鼠标");
}else if (e.getClickCount() == 2) {
btn.setLabel("双击鼠标");
}
}else{
if (e.getClickCount() == 1) {
p = e.getPoint();
showStatus(p.x+","+p.y+"单击鼠标");
}else if (e.getClickCount() == 2) {
p = e.getPoint();
showStatus(p.x+","+p.y+"双击鼠标");
}
}
}
public void mouseEntered(MouseEvent e){
if (e.getSource() == btn) {
btn.setLabel("进入Button");
}else{
showStatus("进入Applet");
}
}
public void mouseExited(MouseEvent e){
if (e.getSource() == btn) {
btn.setLabel("退出Button");
}else{
showStatus("退出Applet");
}
}
public void mousePressed(MouseEvent e){
if (e.getSource() == btn) {
btn.setLabel("按下鼠标");
}else{
showStatus("按下鼠标");
}
}
public void mouseReleased(MouseEvent e){
if (e.getSource() == btn) {
btn.setLabel("松开鼠标");
}else{
showStatus("松开鼠标");
}
}
public void mouseMoved(MouseEvent e){
if (e.getSource() == btn) {
btn.setLabel("移动鼠标");
}else{
showStatus("移动鼠标，新位置"+e.getX()+","+e.getY());
}
}
public void mouseDragged(MouseEvent e){
if (e.getSource() == btn) {
btn.setLabel("拖动鼠标");
}else{
showStatus("拖动鼠标");
}
}
}
10.测试键盘事件的例子
UserKeyEvent.java
package SampleGUI;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;public class UserKeyEvent extends Applet implements KeyListener{
Button btn;
public void init(){
btn = new Button("test");
btn.addKeyListener(this);
this.addKeyListener(this);
add(btn);
}
@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
char ch = e.getKeyChar();
if (ch == 'Y' || ch == 'y') {
btn.setLabel("同意");
}else if (ch == 'N' || ch == 'n') {
btn.setLabel("反对");
}else{
btn.setLabel("无效");
}
} @Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
} @Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
}
11. 测试输入输出流例子
SystemIO.java文件
package MThread;
import java.io.*;public class SystemIO{
public static void main(String []args){
int bytes = 0;
byte buf[] = new byte[255];
System.out.println("\n请输入任意文本: ");
try
{
bytes = System.in.read(buf, 0, 255);
System.out.println("这是你输入的文本行: ");
String inSr = new String(buf, 0, bytes);
System.out.println(inSr);
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
}
}
例子一 UserFileInputStream.java文件
package MThread;
import java.io.*;public class UserFileInputStream{
public static void main(String []args){
byte buf[] = new byte[2056];
try {
FileInputStream fileIn = new FileInputStream("./src/Mthread/UserFileInputStream.java");
int bytes = fileIn.read(buf, 0, 2056);
String inSr = new String(buf, 0, bytes);
System.out.println(inSr);
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
}
}例子二 UserFileOutputStream.java文件
package MThread;
import java.io.*;public class UserFileOutputStream{
public static void main(String []args){
byte buf[] = new byte[255];
byte bufIn[] = new byte[255];
try {
String str = "你好,这是已有的文本";
buf = str.getBytes();
FileOutputStream fileOut = new FileOutputStream("Hello.txt");
fileOut.write(buf, 0, buf.length);
fileOut.flush();
fileOut.close();
System.out.println("\n请输入一行文本： ");
int bytes = System.in.read(bufIn, 0, 255);
fileOut = new FileOutputStream("Hello.txt", true);
fileOut.write(bufIn, 0, bytes);
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
}
}例子三 线程
MThread.java文件
package MThread;
//package MThread;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;public class MThread{
public static void main(String []args){
System.out.println("HelloWorld");
thread2 t1= new thread2("线程实例1");
t1.start();
thread2 t2 = new thread2("线程实例2");
t2.start();
thread2 t3 = new thread2("线程实例3");
t3.start();
}
}class thread2 extends Thread{
Thread thread;
String str;
public thread2(String str){
this.str = str;
}
public void start(){
thread = new Thread(this);
thread.start();
}
public void run(){
int i = 0;
while (thread != null) {
try {
if (5 == i) {
sleep(10000);
}
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
System.out.println(str);
i++;
}
}
}
例子四 线程
UserRunnable.java
package MThread;
import java.awt.*;
import java.applet.*;
import java.applet.Applet;public class UserRunnable extends Applet implements Runnable{
Thread t;
Image imgs[];
int high, h1, h2, h3;
public void init(){
high = getHeight()/3;
h1 = high;
h2 = high * 2;
h3 = high * 3;
imgs = new Image[3];
for (int i = 0; i < 3; i++) {
imgs[i] = getImage(getDocumentBase(), "image"+(i+1)+".png");
}
}
public void start(){
t = new Thread(this);
t.start();
}
public void stop(){
t = null;
}
public void run(){
while (t != null) {
try {
Thread.sleep(10000);
repaint();
h1--;
if (0 == h1) {
Thread.sleep(30000);
h2 = high;
}
h2--;
if (0 == h2) {
Thread.sleep(30000);
h3 = high;
}
h3--;
if (0 == h3) {
Thread.sleep(30000);
h1 = high;
}
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
} }
}
public void paint(Graphics g){
g.drawImage(imgs[0], 0, h1, this);
g.drawImage(imgs[1], 0, h2, this);
g.drawImage(imgs[2], 0, h3, this);
}
public void update(Graphics g){
paint(g);
}
}
UserFile.java文件
package MThread;
import java.io.*;public class UserFile{
public static void main(String []args){
try {
File f = new File("temp.txt");
System.out.println("创建临时文件");
FileOutputStream fout = new FileOutputStream(f);
PrintStream p = new PrintStream(fout);
p.println("将这句话写入临时文件");
System.out.println("写临时文件");
p.close();
f.deleteOnExit();
System.out.println("删除临时文件");
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
}
}
数据库编程例子
UserJDBC.java
1. 先用Microsoft Visual FoxPro 6.0建立FoxPro数据库，数据库名为Student.mdb, 其中一个表为Xuesheng.dbf, 表中有学号、姓名、班级、出生日期、性别字段, 并添加几条记录进去。
2.配置ODBC数据源： 依次找到程序---管理工具---数据源（ODBC）（在控制面板中可以找到ODBC），调出“ODBC数据源管理器”，点击“添加”按钮，出现“创建新数据源”窗口，选择Microsoft Visual FoxPro Driver，点击完成。进入“ODBC Visual FoxPro Setup”窗口。
Data Source Name: ODBC提供给应用程序的数据库的名字。（ 给数据库取个名字）
Description: 用来说明数据库的文字信息，根据自己的需要填写。
Path: ODBC映射数据库的具体路径，可以直接填写完整路径，也可以点击“Browse（浏览）”按钮选择数据库，这里选择之前建立的Student.mdb数据库，点击OK按钮，可以看见“ODBC数据源管理器”窗口多了一个STU数据源。
package MThread;
import java.sql.*;public class UserJDBC{
public static void main(String []args){
try {
Statement stmt;
PreparedStatement pstmt;
ResultSet rs;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String urlName = "jdbc:odbc:STU";
Connection conn = DriverManager.getConnection(urlName, "", "");
stmt = conn.createStatement();
rs = stmt.executeQuery("select 学号, 姓名, 班级 from Xuesheng WHERE 班级='025'");
System.out.println("显示所有返回结果: ");
while(rs.next()) {
String strNumber = rs.getString("学号");
String strName = rs.getString("姓名");
String strClass = rs.getString(3);
System.out.println("学号： "+strNumber+" 姓名： "+strName+" 班级："+strClass);
}
pstmt = conn.prepareStatement("UPDATE Xuesheng SET 班级= ? WHERE 班级=?");
pstmt.setString(1, "计算机");
pstmt.setString(2, "025");
pstmt.executeUpdate();
conn.close();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
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