Java线程基础操作

线程的常用操作

static int	activeCount() 返回活动线程数量
static Thread	currentThread() 返回当前线程
ClassLoader	getContextClassLoader() 返回类加载器
long	getId() 返回线程的id,每个线程都有唯一的id
String	getName() 返回线程名称.
int	getPriority() 返回线程优先级
Thread.State	getState() 返回线程状态
void	interrupt() 中断线程.
static boolean	interrupted() 判断线程的中断状态
boolean	isAlive() 判断线程是否终止
boolean	isDaemon() 是否为守护线程
boolean	isInterrupted() 判断线程的中断状态
void	join() 线程合并
void	run()
void	setDaemon(boolean on) 设置线程为守护线程
void	setName(String name) 设置线程名称
void	setPriority(int newPriority) 设置优先级
static void	sleep(long millis)线程睡眠(休眠)
void	start() 开启新的线程
void	stop() 线程终止
String	toString()
static void	yield() 线程让步

package com.wkcto.chapter07.method;
/**
 * 演示线程的基本操作
 * 			Thread.currentThread()		返回当前线程
 * 			t1.getName()					返回线程名称, 线程默认名称 : Thread-0 / Thread-1 
 * 			t1.setName("t1")				设置线程名称
 * 			t1.isAlive()					判断线程是否终止
 * 			Thread.activeCount()			活动线程的数量
 * @author 蛙课网
 *
 */
public class Test01 {
	public static void main(String[] args) {
		Thread t1 = new Thread( new Runnable() {
			@Override
			public void run() {
				for( int i = 1; i<=100; i++){
//					System.out.println("sub thread: " + i);
					System.out.println( Thread.currentThread().getName() + "==>" + i);
				}
			}
		});	
		t1.setName("t1");
		t1.start();
		
		new Thread( new Runnable() {
			@Override
			public void run() {
				for( int i = 1; i<=100; i++){
					System.out.println( Thread.currentThread().getName() + "====>" + i);
				}
			}
		},  "t2").start();
		
		System.out.println("11 : " +  Thread.activeCount() );  		//活动线程的数量
		
		//main线程
		for( int i = 1; i<=100; i++){
			System.out.println( Thread.currentThread().getName() + "------->" + i);
		}
		
		System.out.println( "t1 alive: " + t1.isAlive());
		
		System.out.println("22 : " +  Thread.activeCount() );  		//活动线程的数量
	}
}

package com.wkcto.chapter07.method;
/**
 * 守护线程
 * 		为其他线程服务的, 不能单独运行 , 当JVM中只有守护线程时, JVM退出 
 * @author 蛙课网
 *
 */
public class Test02 {

	public static void main(String[] args) {
		Thread t1 = new Thread(new Runnable() {
			@Override
			public void run() {
				for (int i = 1; i <= 100; i++) {
					System.out.println(Thread.currentThread().getName() + "--> " + i);
				}
			}
		} , "t1");
		t1.start();
		
		Thread t2 = new Thread(new Runnable() {
			@Override
			public void run() {
				for (int i = 1; i <= 500; i++) {
					System.out.println(Thread.currentThread().getName() + "----> " + i);
				}
			}
		} , "t2");
		t2.setDaemon( true ); 		//设置线程为守护线程
		t2.start();
		
		//main线程
		for (int i = 1; i <= 100; i++) {
			System.out.println(Thread.currentThread().getName() + "==> " + i);
		}
	}

}

package com.wkcto.chapter07.method;
/**
 * 判断线程的状态
 * @author 蛙课网
 *
 */
public class Test03 {

	public static void main(String[] args) {
		Thread t1 = new Thread(new Runnable() {
			@Override
			public void run() {
				for (int i = 1; i <= 100; i++) {
					System.out.println(Thread.currentThread().getName() + "--> " + i);
				}
			}
		});
		
		System.out.println("111: " + t1.getState());	 //111: NEW 新建状态,刚刚创建了线程对象	
		t1.start();
		System.out.println("222: " + t1.getState());	//222: RUNNABLE 可运行状态,就绪状态, 调用了start()
		
		//main线程
		for (int i = 1; i <= 300; i++) {
			System.out.println(Thread.currentThread().getName() + "--> " + i);
		}
		
		System.out.println("333: " + t1.getState()); 	//333: TERMINATED 终止状态,线程已结束	
		
	}

}

线程的生命周期