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TreeMap clone() Method in Java

  • Last Updated : 28 Jun, 2018

The java.util.TreeMap.clone() method is used to return a shallow copy of the mentioned treemap. It just creates a copy of the map.

Syntax:

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Tree_Map.clone()

Parameters: The method does not take any parameters.

Return Value: The method just returns a copy of the TreeMap.



Below programs are used to illustrate the working of java.util.TreeMap.clone() Method:
Program 1: Mapping String Values to Integer Keys.




// Java code to illustrate the clone() method
import java.util.*;
  
public class Tree_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty TreeMap
        TreeMap<Integer, String> tree_map = new TreeMap<Integer, String>();
  
        // Mapping string values to int keys
        tree_map.put(10, "Geeks");
        tree_map.put(15, "4");
        tree_map.put(20, "Geeks");
        tree_map.put(25, "Welcomes");
        tree_map.put(30, "You");
  
        // Displaying the TreeMap
        System.out.println("Initial Mappings are: " + tree_map);
  
        // Displaying the cloned TreeMapusing clone()
        System.out.println("The cloned map look like this: "
        tree_map.clone());
    }
}

Program 2: Mapping Integer Values to String Keys.




// Java code to illustrate the clone() method
import java.util.*;
  
public class Tree_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty TreeMap
        TreeMap<String, Integer> tree_map = new TreeMap<String, Integer>();
  
        // Mapping int values to string keys
        tree_map.put("Geeks", 10);
        tree_map.put("4", 15);
        tree_map.put("Geeks", 20);
        tree_map.put("Welcomes", 25);
        tree_map.put("You", 30);
  
        // Displaying the TreeMap
        System.out.println("Initial Mappings are: " + tree_map);
  
        // Displaying the cloned TreeMapusing clone()
        System.out.println("The cloned map look like this: " +
        tree_map.clone());
    }
}

Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.




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