走起多线程

package Thread02;

public class JoinThread extends Thread {
	// 为线程命名
	public JoinThread(String name) {
		super(name);

	}

	public void run() {
		for (int i = 0; i <= 10; i++) {
			System.out.println(Thread.currentThread().getName() + " " + i);
		}

	}

}

package Thread02;

public class Test {
	public static void main(String[] args) throws Exception {
		new JoinThread("新的小线程").start();
		for (int i = 0; i <10; i++) {
			if (i==5) {
				JoinThread jjj= new JoinThread("被  join的县城");
				jjj.start();
				//新线程和主线程会被阻塞，阻塞停止后会进入就绪状态
				jjj.join();
			}
			System.out.println(Thread.currentThread().getName()+" "+ i);
		}
	}

}

后台线程  ：

package Thread03;

public class BackGroudThread implements Runnable {
	public void run() {
		for (int i = 0; i < 10000; i++) {
			System.out.println("后台线程执行第" + i + "次");
			try {
				Thread.sleep(7);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}

	}
}





package Thread03;

public class MyThread extends Thread {
	// 使用继承Thread类的创建方式创建线程
	// run():函数，线程的执行部分
	public void run() {
		for (int i = 0; i <= 4; i++) {
			System.out.println("线程第" + i + "次执行");

			try {
				Thread.sleep(7);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}

	}
}


package Thread03;

public class Test {
public static void main(String[] args) {
	Thread t1=new MyThread();
	
	Thread t2= new Thread(new BackGroudThread());
	t2.setDaemon(true);//设置为守护线程  
	t2.start();

	
	t1.start();
	
}
}







4：：：：：
package Thread04;

import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
	ThreadYeild ty= new ThreadYeild("线程一");
	ThreadYeild ty2= new ThreadYeild("线程二");
	ty.start();
	ty2.start();
	
	}
	
}




package Thread04;

public class ThreadYeild extends Thread {
	String name;

	public ThreadYeild(String name) {
		super(name);
		this.name = name;
	}

	public void run() {

		for (int i = 0; i < 50; i++) {
			System.out.println(this.getName() + " " + i);
			if (i == 30) {
				Thread.yield();
			}

		}

	}
}