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How to add ThreadLocal variables in java


Use ThreadLocal class to provide thread-local variables. ThreadLocal instances are private static fields in classes that wish to associate state with a thread.

For Eg:

 import java.util.concurrent.atomic.AtomicInteger;

 public class UniqueThreadIdGen {

     private static final AtomicInteger id= new AtomicInteger(0);

     private static final ThreadLocal < Integer > uniqueNum = 
         new ThreadLocal < Integer > () {
             @Override protected Integer initialValue() {
                 return id.getAndIncrement();
         }
     };
 
     public static int getCurrentThreadId() {
         return id.get();
     }
 } 

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