1.创建线程的三种方式

	1）继承Thread类，重写run方法
	2）实现Runnable接口
	3）实现Callable接口

1.1继承Thread类

public class MyThread extends Thread{
    
	@Override
	public void run() {
    
		for (int i = 0; i <100; i++) {
    
			System.out.println("子线程............"+i);
		}
	}

}

public class TestThread {
    
	public static void main(String[] args) {
    
		//1.创建线程对象
		MyThread myThread = new MyThread();
		
		//2.启动线程类
		myThread.start();
		
		//3.打印主线程
		for (int i = 0; i < 50; i++) {
    
			System.out.println("主线程========="+i);
		}
	}
}

如下面的第4步执行的结果会出现重复的，你该怎么办？

public class TestThread {
    
	public static void main(String[] args) {
    
		//1.创建线程对象
		MyThread myThread = new MyThread();
		
		//2.启动线程类
		myThread.start();
		
		//4.创建线程对象2
		MyThread myThread2 = new MyThread();
		myThread2.start();
		
		
		//3.打印主线程
		for (int i = 0; i < 50; i++) {
    
			System.out.println("主线程========="+i);
		}
	}
}

问题答案解决

获取线程ID和线程名称
1.）在Thread的子类中调用this.getId()或this.getName()
2.)使用Thread.currentThread.getId()和Thread.currentThread.getName()
修改线程名称
1.调用线程对象的setName()方法
2.使用线程子类的构造方法赋值

public class MyThread extends Thread{
    
	@Override
	public void run() {
    
		for (int i = 0; i <100; i++) {
    
			System.out.println("线程ID："+this.getId()+"线程名称："+this.getName()+"子线程............"+i);
		}
	}

}

第二种方式

public class MyThread extends Thread{
    
	@Override
	public void run() {
    
		for (int i = 0; i <100; i++) {
    
			System.out.println("线程ID："+Thread.currentThread().getId()+"线程名称："+Thread.currentThread().getName()+"子线程..........."+i);
		}
	}

}

修改线程名称

方式1：

public class TestThread {
    
	public static void main(String[] args) {
    
		//1.创建线程对象
		MyThread myThread = new MyThread();
		
		//2.启动线程类
		//5.修改线程名称(在启动之类修改)
		myThread.setName("我是子线程1");
		myThread.start();
		
		//4.创建线程对象2
		MyThread myThread2 = new MyThread();
		
		myThread2.setName("我是子线程2");
		myThread2.start();
		
		
		//3.打印主线程
		for (int i = 0; i < 50; i++) {
    
			System.out.println("主线程========="+i);
		}
	}
}

方式2：

public class MyThread extends Thread{
    
	
	public MyThread() {
    
		// TODO Auto-generated constructor stub
	}
	public MyThread(String name) {
    
		super(name);
	}
	
	
	@Override
	public void run() {
    
		for (int i = 0; i <100; i++) {
    
			//System.out.println("线程ID："+this.getId()+"线程名称："+this.getName()+"子线程............"+i);
			System.out.println("线程ID："+Thread.currentThread().getId()+"线程名称："+Thread.currentThread().getName()+"子线程..........."+i);
		}
	}

}

public class TestThread {
    
	public static void main(String[] args) {
    
		//1.创建线程对象
		MyThread myThread = new MyThread("我是子线程1");
		
		//2.启动线程类
		//5.修改线程名称(在启动之类修改)
		//myThread.setName("我是子线程1");
		myThread.start();
		
		//4.创建线程对象2
		MyThread myThread2 = new MyThread("我是子线程2");
		
		//myThread2.setName("我是子线程2");
		myThread2.start();
		
		
		//3.打印主线程
		for (int i = 0; i < 50; i++) {
    
			System.out.println("主线程========="+i);
		}
	}
}

案例：卖票问题

/**
 * 卖票窗口类
 * @author DELL
 *
 */
public class TicketWin extends Thread{
    
	
	public TicketWin() {
    
		// TODO Auto-generated constructor stub
	}
	
	public TicketWin(String name) {
    
		super(name);
	}
	
	
	private int ticket=100;//票
	
	@Override
	public void run() {
    
		//卖票功能
		while(true) {
    
			if(ticket <=0 ) {
    
				break;
			}
			System.out.println(Thread.currentThread().getName()+"卖出第"+ticket+"张");
			ticket--;
		}
	}

public class TestticketWin {
    
	public static void main(String[] args) {
    
		//创建四个卖票窗口
		TicketWin w1 = new TicketWin("窗口1");
		TicketWin w2 = new TicketWin("窗口2");
		TicketWin w3 = new TicketWin("窗口3");
		TicketWin w4 = new TicketWin("窗口4");
		
		//启动线程
		w1.start();
		w2.start();
		w3.start();
		w4.start();
	}

}