线程管理之Thread类相关方法简介

落日映苍穹つ 2023-10-16 22:14 45阅读 0赞

CurrentThread() 静态方法

currentThread()方法可返回代码段正在被那个线程调用的信息。

简单案列：打印main 方法，正在被那个线程调用

package com.zzg.thread;
    
    import com.zzg.obj.ThreadObj1;
    
    public class ThreadDemo1 {
    
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		System.out
    				.println("Thread name is:" + Thread.currentThread().getName());
    		System.out.println("Thread id is:" + Thread.currentThread().getId());
    		System.out.println("Thread priority is:"
    				+ Thread.currentThread().getPriority());
    		System.out.println("Thread state is:"
    				+ Thread.currentThread().getState().name());
    
    	}
    
    }

简单案列：探讨Thread 线程类run 方法的调用

package com.zzg.thread;
    
    import com.zzg.obj.ThreadObj1;
    
    public class ThreadDemo1 {
    
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		ThreadObj1 obj=new ThreadObj1();
    		Thread thred=new Thread(obj);
    		thred.start();
    
    	}
    	
    	private static class ThreadObj1 implements Runnable {	
    		//正在调用构造函数，线程相关信息
    		public ThreadObj1() {
    			System.out.println("constructor Thread name is:"+Thread.currentThread().getName());
    			System.out.println("constructor Thread id is:"+Thread.currentThread().getId());
    			System.out.println("constructor Thread priority is:"+Thread.currentThread().getPriority());
    			System.out.println("constructor Thread state is:"+Thread.currentThread().getState().name());
    			
    		}
    		正在调用run函数，线程相关信息
    		@Override
    		public void run() {
    			// TODO Auto-generated method stub
    			System.out.println("run Thread name is:"+Thread.currentThread().getName());
    			System.out.println("run Thread id is:"+Thread.currentThread().getId());
    			System.out.println("run Thread priority is:"+Thread.currentThread().getPriority());
    			System.out.println("run Thread state is:"+Thread.currentThread().getState().name());
    		}
    
    	}
    
    }

![Center][]

从运行的结果可以发现，ThreadObj1类的构造函数是被main线程调用，而run 方法是自动调用的方法。

isAlive()实例方法

isAlive()方法是判断当前线程是否处于活动状态。

什么是活动状态？

活动状态是指线程已经启动且尚未终止。线程处于正在运行或准备开始运行的状态，就认为线程是“活动”的。

简单案列：打印线程的活动状态（新建、活动状态、销毁状态）

package com.zzg.thread;
    
    public class ThreadDemo2 {
    
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		ThreadObj1 obj=new ThreadObj1();
    		Thread thread=new Thread(obj);
    		System.out.println("thread is alive:"+thread.isAlive());
    		thread.start();
    		System.out.println("thread is alive:"+thread.isAlive());
    		try{
    			Thread.sleep(3000);
    			System.out.println("thread is alive:"+thread.isAlive());
    		}catch(Exception e){
    			e.printStackTrace();
    		}
    		
    	}
    
    	private static class ThreadObj1 implements Runnable {
    
    		public ThreadObj1() {
    
    		}
    
    		@Override
    		public void run() {
    
    		}
    
    	}
    
    }

![Center 1][]

还有其他Thread类的相关方法，大家可以参考JDK 开发文档

[Center]: https://img-blog.csdn.net/20150908011215276?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20150908012454975?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center