Java — Multithreading Enhancement | Code Factory
2 min readJun 3, 2020
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- Based on functionality we can group threads into a single unit which is nothing but Thread Group that is Thread Group contains a group of threads.
- In addition to threads, Thread Group can also contain sub thread groups.
- The main advantage of maintaining threads in the form of thread group is we can perform common operations very easily.
- Every thread in Java belongs to some group.
- Main thread belongs to main group.
- Every thread group in Java is a child group of system group either directly or indirectly. Hence system group act as root for all thread groups in Java.
- * System group contains several system level threads like finalizar, refernce handler, signal dispatcher, attach listener.
package com.example.thread;public class Test {
public static void main(String... args) {
System.out.println(Thread.currentThread().getThreadGroup().getName()); // main
System.out.println(Thread.currentThread().getThreadGroup().getParent().getName()); // system
//Thread.currentThread() --> main thread
//Thread.currentThread().getThreadGroup() --> main thread group
//Thread.currentThread().getThreadGroup().getParent() --> system thread group
}
}
- Thread Group is a Java class present in java.lang package and it is direct child class of Object.