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目标：1、线程概念2、Thread3、Runnable4、线程的生命周期5、线程同步内容：1、线程概念：线程，有时被称为轻量级进程(Lightweight Process，LWP），是程序执行流的最小单元。
一般一个程序是由许多的线程组成。
例如：一个程序中的动态时钟示例：在窗口中制作一个动态时钟package com.javaoo;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.table.*;import java.io.*;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Vector;public class TestTableAdvanced extends JFrame {private Object[] columnNames = {"学号", "姓名", "年龄", "性别"};private Object[][] rowData = {{"s001", "张三", 23, "男"},{"s002", "李四", 22, "男"},{"s003", "王麻子", 21, "男"}};private DefaultTableModel tableModel = new DefaultTableModel(rowData, columnNames); private JTable table = new JTable(tableModel);private JButton jbtSave = new JButton("Save");private JButton jbtClear = new JButton("Clear");private JButton jbtRestore = new JButton("Restore");private JButton jbtAddRow = new JButton("Add New Row");private JButton jbtAddColumn = new JButton("Add New Column");private JButton jbtDeleteRow = new JButton("Delete Selected Row");private JButton jbtDeleteColumn = new JButton("Delete Selected Column");private JLabel timeLabel = new JLabel(); public TestTableAdvanced() {super("JTable高级应用示例");setSize(400, 300);setDefaultCloseOperation(EXIT_ON_CLOSE); setResizable(false);setLocation();init();addListener();setVisible(true);}public void init() {JScrollPane scroll = new JScrollPane(table); getContentPane().add(scroll);JPanel p1 = new JPanel(); //存放Save,Clear,Restore按钮p1.add(jbtSave);p1.add(jbtClear);p1.add(jbtRestore);JPanel p2 = new JPanel(); //存放操作Table的功能按钮p2.setLayout(new GridLayout(2,2));p2.add(jbtAddRow);p2.add(jbtAddColumn);p2.add(jbtDeleteRow);p2.add(jbtDeleteColumn);JPanel p3 = new JPanel(); //窗口底部的大面板p3.setLayout(new GridLayout(2,1));p3.add(p1);p3.add(p2);getContentPane().add(p3,BorderLayout.SOUTH);JPanel p4 = new JPanel();p4.setLayout(new BorderLayout());p4.add(timeLabel, BorderLayout.EAST); getContentPane().add(p4,BorderLayout.NORTH);TimeRunning running = new TimeRunning(); running.start();}public void setLocation() {Dimension d = this.getSize();int width = d.width;int height = d.height;Toolkit kit = this.getToolkit();int screenWidth = kit.getScreenSize().width;int screenHeight = kit.getScreenSize().height;this.setLocation((screenWidth - width) / 2, (screenHeight - height) / 2);}public void addListener() {jbtAddRow.addActionListener(new ActionListener() { //匿名内部类实现按钮的监听public void actionPerformed(ActionEvent e) {int index = table.getSelectedRow();if (index >= 0) {tableModel.insertRow(index, new Vector());//在选择中行上新增数据} else {tableModel.addRow(new Vector()); //在Table 的末尾新增数据}}});jbtAddColumn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String name = JOptionPane.showInputDialog("输入列的名字：");tableModel.addColumn(name, new Vector()); }});jbtDeleteRow.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {int index = table.getSelectedRow();if (index >= 0) {tableModel.removeRow(index);}}});jbtDeleteColumn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {int index = table.getSelectedColumn();if (index >= 0) {TableColumnModel columnModel = table.getColumnModel();TableColumn tableColumn = columnModel.getColumn(index); columnModel.removeColumn(tableColumn);}}});jbtSave.addActionListener(newActionListener() {public void actionPerformed(ActionEvent e) {try {ObjectOutputStream out = new ObjectOutputStream(newFileOutputStream("tableModel.dat"));out.writeObject(tableModel.getDataVector( ));out.writeObject(getColumnNames());out.close();} catch (IOException e1) {e1.printStackTrace();}}});jbtRestore.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {ObjectInputStream input = new ObjectInputStream(newFileInputStream("tableModel.dat"));Vector rowData = (Vector) input.readObject();Vector columnNames = (Vector) input.readObject();tableModel.setDataVector(rowData, columnNames);input.close();} catch (Exception e1) {e1.printStackTrace();}}});jbtClear.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {tableModel.setRowCount(0);}});}private Vector getColumnNames() { //获取Table表格中的所有列名Vector<String> columnNames = new Vector<String>();for (int i = 0; i < table.getColumnCount(); i++) {columnNames.add(table.getColumnName(i));}return columnNames;}class TimeRunning extends Thread { //定义public void run() {while (true) {try {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String s = sdf.format(new Date()); timeLabel.setText(s);Thread.sleep(1000);} catch (Exception e) {e.printStackTrace();}}}}public static void main(String[] args) { new TestTableAdvanced();}}2、进程与线程区分（1）一个在电脑上运行的程序（即：此程序已经在内存中），就是我们通常所说的进程。
