Java教程

Java isAlive()方法

线程类的 isAlive()方法测试线程是否处于活动状态。当调用线程类的start()方法并且该线程尚未死亡时,该线程被视为活动线程。如果线程仍在运行但尚未完成,则此方法返回true。

语法

public final boolean isAlive()

返回

如果线程处于活动状态,则此方法将返回true,否则返回false。

示例

public class JavaIsAliveExp extends Thread
{
    public void run()
    {
        try
        {
            Thread.sleep(300);
            System.out.println("is run() method isAlive "+Thread.currentThread().isAlive());
        }
        catch (InterruptedException ie) {
        }
    }
    public static void main(String[] args)
    {
        JavaIsAliveExp t1 = new JavaIsAliveExp();
        System.out.println("before starting thread isAlive: "+t1.isAlive());
        t1.start();
        System.out.println("after starting thread isAlive: "+t1.isAlive());
    }
}
输出:
before starting thread isAlive: false
after starting thread isAlive: true
is run() method isAlive true

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