Java Thread getId() method

The getId() method is used to return the thread identifier. The thread ID is a unique positive number which was generated at the time of thread creation.

The thread ID remains unchanged during its lifetime. When the thread is terminated, the ID of thread can be reused.

Syntax

Return

Example

public class GetIdExample extends Thread
{  
    public void run()
    {  
        System.out.println("running...");  
    }  
    public static void main(String args[])
    {  
        // creating one thread
        GetIdExample t1=new GetIdExample();  
        // Returns the identifier of this Thread
        System.out.println("Name of t1: "+t1.getName());
        System.out.println("Id of t1: "+t1.getId()); 
        // Start the thread 
        t1.start();
    }  
} 

Test it Now

Output:

Name of t1: Thread-0
Id of t1: 21
running...

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