Java Collections synchronizedSortedMap() Method

The synchronizedSortedMap() method of Java Collections class is used to get a synchronized (thread-safe) sorted map backed by the specified sorted map.

Syntax

Following is the declaration of synchronizedSortedMap() method:

Parameter

Parameter	Description	Required/Optional
m	It is the sorted map which will be wrapped in a synchronized sorted map.	Required

Returns

The synchronizedSortedMap() method returns a synchronized view of the specified sorted Map.

Exceptions

Example 1

import java.util.*;
public class CollectionsSynchronizedSortedMapExample1 {
	public static void main(String[] args) {
		SortedMap<String, String> map = new TreeMap<String, String>();
		map.put("1", "Whatsapp");
		map.put("4", "Instagram");
		map.put("3", "Facebook");
		map.put("2", "Twitter");
		SortedMap<String, String> sortmap = Collections.synchronizedSortedMap(map);
		System.out.println("Synchronized sorted map is :" + sortmap);	            
	      }
}

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Output:

Synchronized sorted map is :{1=Whatsapp, 2=Twitter, 3=Facebook, 4=Instagram}

Example 2

import java.util.*;
public class CollectionsSynchronizedSortedMapExample2 {
	public static void main(String[] args) {
		SortedMap<Integer, Integer> map = new TreeMap<>();
		map.put(1, 1001);
		map.put(2, 1002);
		map.put(5, 1005);
		map.put(4, 1004);	
		map.put(3, 1003);
		//System.out.println("Map before Synchronized map: " + map);		
		SortedMap<Integer, Integer> synmap = Collections.synchronizedSortedMap(map);	
	    System.out.println("Synchronized sorted map:" + synmap);
	     }
}

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Output:

Synchronized sorted map:{1=1001, 2=1002, 3=1003, 4=1004, 5=1005}

Example 3

import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class CollectionsSynchronizedSortedMapExample3 {
    private static AtomicInteger counter = new AtomicInteger();
    public static void main(String... args) throws InterruptedException {
        SortedMap<Integer, Integer> m = new TreeMap<>();
        SortedMap<Integer, Integer> map = Collections.synchronizedSortedMap(m);
        final ExecutorService e = Executors.newFixedThreadPool(10);
        for (int i = 0; i < 10; i++) {
            e.execute(() -> map.put(counter.incrementAndGet(),
                    (int) (Math.random() * 100)));
        }
        e.shutdown();
        e.awaitTermination(1000, TimeUnit.SECONDS);
        System.out.println(map.size());//should be 10
    }
}

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Output:

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