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Java - ThreadGroup getMaxPriority() Method
Description
The Java ThreadGroup getMaxPriority() method returns the maximum priority of this thread group. Threads that are part of this group cannot have a higher priority than the maximum priority.
Declaration
Following is the declaration for java.lang.ThreadGroup.getMaxPriority() method
public final int getMaxPriority()
Parameters
NA
Return Value
This method returns the maximum priority that a thread in this thread group can have.
Exception
NA
Example 1
The following example shows the usage of ThreadGroup getMaxPriority() method in case of a single ThreadGroup object. We've created a ThreadGroup object and assigned it a name. Then we've created two threads using the threadgroup object created earlier. Using getMaxPriority() method, we're getting all the maximum priority of the thread group object.
package com.tutorialspoint; public class ThreadGroupDemo implements Runnable { public static void main(String[] args) { ThreadGroupDemo tg = new ThreadGroupDemo(); tg.start(); } public void start() { try { // create a ThreadGroup ThreadGroup threadGroup = new ThreadGroup("ThreadGroup"); // create a thread Thread t1 = new Thread(threadGroup, this); System.out.println("Starting " + t1.getName() + "..."); t1.start(); // create another thread Thread t2 = new Thread(threadGroup, this); System.out.println("Starting " + t2.getName() + "..."); t2.start(); // returns the maximum priority of thread group int i = threadGroup.getMaxPriority(); System.out.println("Maximum priority of threadGroup =" + i); // block until the other threads finish t1.join(); t2.join(); } catch (InterruptedException ex) { System.out.println(ex.toString()); } } // implements run() public void run() { for(int i = 0; i < 4;i++) { i++; try { Thread.sleep(50); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println(Thread.currentThread().getName() + " finished executing."); } }
Output
Let us compile and run the above program, this will produce the following result −
Starting Thread-0... Starting Thread-1... Maximum priority of threadGroup =10 Thread-0 finished executing. Thread-1 finished executing.
Example 2
The following example shows the usage of ThreadGroup getMaxPriority() method in case of multiple ThreadGroup objects. We've created a ThreadGroup object and assigned it a name. As next, we've created a child ThreadGroup object. Then we've created two threads using the threadgroup objects created earlier. Using getMaxPriority() method, we're printing max priorities of each threadgroup object.
package com.tutorialspoint; public class ThreadGroupDemo implements Runnable { public static void main(String[] args) { ThreadGroupDemo tg = new ThreadGroupDemo(); tg.start(); } public void start() { try { // create a parent ThreadGroup ThreadGroup pThreadGroup = new ThreadGroup("parent ThreadGroup"); // create a child ThreadGroup for parent ThreadGroup ThreadGroup cThreadGroup = new ThreadGroup(pThreadGroup, "child ThreadGroup"); // create a thread Thread t1 = new Thread(pThreadGroup, this); System.out.println("Starting " + t1.getName() + "..."); t1.start(); // create another thread Thread t2 = new Thread(cThreadGroup, this); System.out.println("Starting " + t2.getName() + "..."); t2.start(); // returns the maximum priority of thread group int i = pThreadGroup.getMaxPriority(); System.out.println("Maximum priority of pThreadGroup =" + i); i = cThreadGroup.getMaxPriority(); System.out.println("Maximum priority of cThreadGroup =" + i); // block until the other threads finish t1.join(); t2.join(); } catch (InterruptedException ex) { System.out.println(ex.toString()); } } // implements run() public void run() { for(int i = 0; i < 4;i++) { i++; try { Thread.sleep(50); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println(Thread.currentThread().getName() + " finished executing."); } }
Output
Let us compile and run the above program, this will produce the following result −
Starting Thread-0... Starting Thread-1... Maximum priority of pThreadGroup =10 Maximum priority of cThreadGroup =10 Thread-1 finished executing. Thread-0 finished executing.
Example 3
The following example shows the usage of ThreadGroup getMaxPriority() method in case of child and grandchild ThreadGroup objects. We've created a ThreadGroup object and assigned it a name. As next, we've created a child ThreadGroup object. Then we've created two threads using the child and grandchild threadgroup objects created earlier. Using getMaxPriority() method, we're printing max priorities of each threadgroup object.
package com.tutorialspoint; public class ThreadGroupDemo implements Runnable { public static void main(String[] args) { ThreadGroupDemo tg = new ThreadGroupDemo(); tg.start(); } public void start() { try { // create a parent ThreadGroup ThreadGroup pThreadGroup = new ThreadGroup("Parent ThreadGroup"); // create a child ThreadGroup for parent ThreadGroup ThreadGroup cThreadGroup = new ThreadGroup(pThreadGroup, "Child ThreadGroup"); // create a grandchild ThreadGroup for parent ThreadGroup ThreadGroup gThreadGroup = new ThreadGroup(cThreadGroup, "GrandChild ThreadGroup"); // create a thread Thread t1 = new Thread(cThreadGroup, this); System.out.println("Starting " + t1.getName() + "..."); t1.start(); // create another thread Thread t2 = new Thread(gThreadGroup, this); System.out.println("Starting " + t2.getName() + "..."); t2.start(); // returns the maximum priority of thread group int i = pThreadGroup.getMaxPriority(); System.out.println("Maximum priority of pThreadGroup =" + i); i = cThreadGroup.getMaxPriority(); System.out.println("Maximum priority of cThreadGroup =" + i); i = gThreadGroup.getMaxPriority(); System.out.println("Maximum priority of gThreadGroup =" + i); // block until the other threads finish t1.join(); t2.join(); } catch (InterruptedException ex) { System.out.println(ex.toString()); } } // implements run() public void run() { for(int i = 0; i < 4;i++) { i++; try { Thread.sleep(50); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println(Thread.currentThread().getName() + " finished executing."); } }
Output
Let us compile and run the above program, this will produce the following result −
Starting Thread-0... Starting Thread-1... Maximum priority of pThreadGroup =10 Maximum priority of cThreadGroup =10 Maximum priority of gThreadGroup =10 Thread-0 finished executing. Thread-1 finished executing.