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Thread.currentThread()方法
Thread.currentThread()可以获取当前线程的引用,一般都是在没有线程对象又需要获得线程信息时通过Thread.currentThread()获取当前代码段所在线程的引用。
getId();获取该线程的标识符
getName();获取该线程名称
getState();获取线程状态
boolean isAlive();测试线程是否属于活动状态
boolean isDaemon();测试线程是否为守护线程
boolean isInterrupted();测试线程是否已经中断
public class Demo_1 {
public static void main(String[] args){
MyThread myThread = new MyThread();
myThread.setName("A");
myThread.start();
}
}
class MyThread extends Thread {
public MyThread(){
System.out.println("------" + "构造函数开始" + "------");
System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
System.out.println("Thread.currentThread().getId) = " + Thread.currentThread().getId());
System.out.println("Thread.currentThread().isDaemon() = " + Thread.currentThread().isDaemon());
System.out.println("Thread.currentThread().isInterrupted()= " + Thread.currentThread().isInterrupted());
System.out.println("Thread.currentThread().getState() = " + Thread.currentThread().getState());
System.out.println("Thread.currentThread().isAlive() = " + Thread.currentThread().isAlive());
System.out.println("------" + "构造函数结束" + "------");
}
@Override
public void run(){
System.out.println("------" + "run()开始" + "------");
System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());
System.out.println("Thread.currentThread().getId() = " + Thread.currentThread().getId());
System.out.println("Thread.currentThread().isDaemon() = " + Thread.currentThread().isDaemon());
System.out.println("Thread.currentThread().isInterrupted() = " + Thread.currentThread().isInterrupted());
System.out.println("Thread.currentThread().getState() = " + Thread.currentThread().getState());
System.out.println("Thread.currentThread().isAlive() = " + Thread.currentThread().isAlive());
System.out.println("------" + "run()结束" + "------");
}
}
运行结果:
守护线程
守护线程与普通线程表面上并没有什么区别,只需要通过Thread类提供的方法设置即可。
void setDaeMon(boolean c)方法
当参数为true时,该线程为守护线程
守护线程的特点:
当线程中只剩下守护线程时,所有守护线程终止
GC就是运行在一个守护线程上
注意:设置线程为守护线程,要在该线程启动前设置
import java.io.IOException;
public class Demo_1 {
public static void main(String[] args){
MyThread myThread = new MyThread();
myThread.setDaemon(true);
myThread.start();
try {
System.in.read(); // 接受输入,使程序在此停顿,一旦接收到用户输入,main线程结束,守护线程自动结束
} catch (IOException ex) {}
}
}
class MyThread extends Thread {
@Override
public void run(){
System.out.println("Thread.currentThread().isDaemon() = " + Thread.currentThread().isDaemon());
}
}
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