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Multithreading Enhancement
ThreadGroup
Based on functionality we can group thread in a single unit which is nothing but ThreadGroup.
ThreadGroup contains a group of thread. In addition to threads, ThreadGroup can also contain sub thread group.
The main advantage of maintaining threads in the form of threadgroup is we can perform common operations very easily.
Every thread in java belongs to some group. Main thread belongs to main group. Every ThreadGroup in java is the child group of system group either directly or indirectly. System group access root for all thread groups in java. System group containes several system level threads like below:
finalizer, reference handler, signal dispatcher, attach listner etc.
ThreadGroup is a java class present in java.lang package and it is the direct child xlass of object.
Constructors
ThreadGroup g=new ThreadGroup(String groupName);
ThreadGroup g=new ThreadGroup(ThreadGroup tg,String groupName);
The parent of this new threadgroup is specified parent threadgroup.
Threads in the threadgroup that have already higher priority will not be affected & for newly added thread this max priority is applicable . example is given below
public class ThreadGroupDemo {
public static void main(String[] args) {
ThreadGroup g1 = new ThreadGroup("tg");
Thread t1 = new Thread(g1, "t1");
g1.setMaxPriority(3);
System.out.println(g1.getMaxPriority());
System.out.println(t1.getPriority());
Thread t2 = new Thread(g1, "t2");
System.out.println(t2.getPriority());
}
}