Java — Constructors of ThreadGroup Class | Code Factory

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1. ThreadGroup tg = new ThreadGroup(String name)

• Create a new Thread Group with specified group name.
• The parent of this new group is the thread group of currently executing thread.

package com.example.thread;
public class Test {
	public static void main(String... args) {
		ThreadGroup tg1 = new ThreadGroup("Group1");
		System.out.println(tg1.getName()); // Group1
		System.out.println(tg1.getParent().getName()); // main
	}
}

2. ThreadGroup tg1 = new ThreadGroup(ThreadGroup tg, String name)

• Creates a new Thread Group with the specified group name.
• The parent of this new thread group specified parent group.

package com.example.thread;
public class Test {
	public static void main(String... args) {
		ThreadGroup tg1 = new ThreadGroup("Group1");
		System.out.println(tg1.getName()); // Group1
		System.out.println(tg1.getParent().getName()); // main
		
		ThreadGroup tg2 = new ThreadGroup(tg1, "Group2");
		System.out.println(tg2.getName()); // Group2
		System.out.println(tg2.getParent().getName()); // Group1
	}
}