using thread-local on Java.

ThreadLocalTest.java

import java.util.Random;

public class ThreadLocalTest implements Runnable {
  
	public static final Random RAND = new Random();
	public static int counter = 1;
	
	public static class MyObject {
		private final int n;
		
		public MyObject(final int n) {
			this.n = n;
		}
		
		public void init() {
			System.out.println("object " + n + " is initialized");
		}
		
		public void work() {
			System.out.println("object " + n + " is working now");
		}
	}
	
	public static class MyThread extends Thread {
		
		public static final ThreadLocal<MyObject> MY_OBJECT = new ThreadLocal<ThreadLocalTest.MyObject>() {
			@Override
			protected synchronized MyObject initialValue() {
				return new MyObject(counter++);
			}
		};
		
		@Override
		public void run() {
			for (int i = 0; i < 10; i++) {
				MyObject myObj = MY_OBJECT.get();
				myObj.work();
				
				try {
					Thread.sleep(100+RAND.nextInt(200));
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
		
	}

	public static void main(String[] args) {
		Runnable me = new ThreadLocalTest();
		me.run();
	}
	
	@Override
	public void run() {
		final int n = 10;
		
		for (int i = 1; i <= n; i++) {
			MyThread mt = new MyThread();
			mt.start();
		}
	}

}