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ConcurrentSkipListMap clone() method in Java with Examples

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  • Last Updated : 12 Feb, 2019

The clone() method of java.util.concurrent.ConcurrentSkipListMap is an in-built function in Java which returns a shallow copy of this ConcurrentSkipListMap instance. The keys and values themselves are not cloned.

Syntax:

ConcurrentSkipListMap.clone()

Parameter: The function does not accept any parameter.

Parameter: This method do not accepts any parameter.

Return Value: The function returns a shallow copy of this ConcurrentSkipListMap.

Below programs illustrate the above method:

Program 1:




// Java Program Demonstrate clone()
// method of ConcurrentSkipListMap
  
import java.util.concurrent.ConcurrentSkipListMap;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Initializing the map
        // using ConcurrentSkipListMap()
        ConcurrentSkipListMap<Integer, Integer> mpp
            = new ConcurrentSkipListMap<Integer,
                                        Integer>();
  
        // Adding elements to this map
        mpp.put(1, 1);
        mpp.put(5, 2);
        mpp.put(2, 7);
  
        // Printing the ConcurrentSkipListMap
        System.out.println("Map: " + mpp);
  
        // Cloning the ConcurrentSkipListMap
        ConcurrentSkipListMap<Integer, Integer>
            clone_mpp = mpp.clone();
  
        // Adding elements to the clone map
        clone_mpp.put(7, 9);
  
        System.out.println("Cloned map is:  "
                           + clone_mpp);
    }
}

Output:

Map: {1=1, 2=7, 5=2}
Cloned map is:  {1=1, 2=7, 5=2, 7=9}

Program 2:




// Java Program Demonstrate clone()
// method of ConcurrentSkipListMap
  
import java.util.concurrent.ConcurrentSkipListMap;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Initializing the map
        // using ConcurrentSkipListMap()
        ConcurrentSkipListMap<Integer, Integer>
            mpp = new ConcurrentSkipListMap<Integer,
                                            Integer>();
  
        // Adding elements to this map
        mpp.put(10, 5);
        mpp.put(54, 20);
        mpp.put(2, 7);
  
        // Printing the ConcurrentSkipListMap
        System.out.println("Map: " + mpp);
  
        // Cloning the ConcurrentSkipListMap
        ConcurrentSkipListMap<Integer, Integer>
            clone_mpp = mpp.clone();
  
        // Adding elements to the clone map
        clone_mpp.put(17, 9);
  
        System.out.println("Cloned map is:  "
                           + clone_mpp);
    }
}

Output:

Map: {2=7, 10=5, 54=20}
Cloned map is:  {2=7, 10=5, 17=9, 54=20}

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentSkipListMap.html#clone–


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