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–
