Java 什么';这两者之间的区别是什么;Thread.currentThread().getName";及;这个.getName";?
代码如下:Java 什么';这两者之间的区别是什么;Thread.currentThread().getName";及;这个.getName";?,java,multithreading,Java,Multithreading,代码如下: import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.ThreadFactory; class UnCatchExceptionThread extends Thread{ public UnCatchExceptionThread(String name){ this.setName(n
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
class UnCatchExceptionThread extends Thread{
public UnCatchExceptionThread(String name){
this.setName(name);
}
@Override
public void run() {
System.out.println("Thread name is: " + this.getName());
throw new RuntimeException();
}
}
class UnCatchExceptionHandler implements Thread.UncaughtExceptionHandler{
@Override
public void uncaughtException(Thread t, Throwable e) {
System.out.println("catch " + e + " from " + t.getName());
}
}
class HandlerFactory implements ThreadFactory{
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setUncaughtExceptionHandler(new UnCatchExceptionHandler());
return t;
}
}
public class CaptureException {
public int i;
/**
* @param args
*/
public static void main(String[] args) {
ExecutorService exec = Executors.newCachedThreadPool(new HandlerFactory());
exec.execute(new UnCatchExceptionThread("Gemoji"));
}
}
输出为:
线程名称为:Gemoji从线程1捕获java.lang.RuntimeException 如果我改变了密码
System.out.println("Thread name is: " + this.getName());
到
输出将更改为
线程名称为:Thread-1从线程1捕获java.lang.RuntimeException
为什么?我假设在某一时刻,UnCatchExceptionThread被传递给您的
HandlerFactory.newThread()
方法,并且该方法返回的线程被执行。如果是这样,您将创建一个没有名称的新线程,该线程将执行作为参数传递的runnable。runnable是UnCatchExceptionThread实例,但正在执行的线程是新线程(r)
因此,在Runnable
run
方法中,this
是UnCatchExceptionThread的实例,并且具有您给他的名称。但是当前线程是新线程(r)
,它有一个默认名称。执行器服务正在创建一个线程“thread-1”,以从给定的runnable运行run命令。因此线程对象名“Gemoji”不是正在运行的真正线程。我忘记了ThreadFactory
接受Runnable
作为参数,并且thread
也实现Runnable
。谢谢你的帮助。
System.out.println("Thread name is: " + Thread.currentThread().getName());