Java.lang.ThreadGroup.isDestroyed() Method
Description
The java.lang.ThreadGroup.isDestroyed() method tests if this thread group has been destroyed.
Declaration
Following is the declaration for java.lang.ThreadGroup.isDestroyed() method
public boolean isDestroyed()
Parameters
NA
Return Value
This method returns true if this object is destroyed.
Exception
NA
Example
The following example shows the usage of java.lang.ThreadGroup.isDestroyed() method.
package com.tutorialspoint;
import java.lang.*;
public class ThreadGroupDemo implements Runnable {
public static void main(String[] args) {
ThreadGroupDemo tg = new ThreadGroupDemo();
tg.func();
}
public void func() {
try {
// create a parent ThreadGroup
ThreadGroup pGroup = new ThreadGroup("Parent ThreadGroup");
// create a child ThreadGroup for parent ThreadGroup
ThreadGroup cGroup = new ThreadGroup(pGroup, "Child ThreadGroup");
// create a thread
Thread t1 = new Thread(pGroup, this);
System.out.println("Starting " + t1.getName() + "...");
t1.start();
// create another thread
Thread t2 = new Thread(cGroup, this);
System.out.println("Starting " + t2.getName() + "...");
t2.start();
// block until the other threads finish
t1.join();
t2.join();
try {
// child group destroyed
if (!cGroup.isDestroyed()) {
cGroup.destroy();
} else {
System.out.println(cGroup.getName() + " destroyed");
}
} catch(IllegalThreadStateException ex) {
System.out.println(cGroup.getName() + " is empty: " + ex.toString());
}
try {
// parent group destroyed
if (!pGroup.isDestroyed()) {
pGroup.destroy();
} else {
System.out.println(pGroup.getName() + " destroyed");
}
} catch(IllegalThreadStateException ex) {
System.out.println(pGroup.getName() + " is empty: " + ex.toString());
}
} catch (InterruptedException ex) {
System.out.println(ex.toString());
}
}
// implements run()
public void run() {
for(int i = 0;i < 1000;i++) {
i++;
}
System.out.println(Thread.currentThread().getName() + " finished executing.");
}
}
Let us compile and run the above program, this will produce the following result −
Starting Thread-0...
Starting Thread-1...
Thread-0 finished executing.
Thread-1 finished executing.
java_lang_threadgroup.htm
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