Java: Copy a Tree Map content to another Tree Map content

Last update on May 23 2025 13:08:53 (UTC/GMT +8 hours)

2. Copy TreeMap to Another TreeMap

Write a Java program to copy Tree Map's content to another Tree Map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example2 {  
   public static void main(String args[]){  
  
  // Create a tree map
   TreeMap<String,String> tree_map1=new TreeMap<String,String>();      
  
  // Put elements to the map 
  tree_map1.put("C1", "Red");
  tree_map1.put("C2", "Green");
  tree_map1.put("C3", "Black");
  tree_map1.put("C4", "White");
  tree_map1.put("C5", "Blue");
   System.out.println("Tree Map 1: "+tree_map1);
   TreeMap<String,String> tree_map2 = new TreeMap<String,String>();
   tree_map2.put("A1", "Orange");
   tree_map2.put("A2", "Pink");
   System.out.println("Tree Map 2: "+tree_map2);
   tree_map1.putAll(tree_map2);
   System.out.println("After coping map2 to map1: "+tree_map1);   
 }  
}

Sample Output:

Tree Map 1: {C1=Red, C2=Green, C3=Black, C4=White, C5=Blue}            
Tree Map 2: {A1=Orange, A2=Pink}                                       
After coping map2 to map1: {A1=Orange, A2=Pink, C1=Red, C2=Green, C3=Bl
ack, C4=White, C5=Blue}

For more Practice: Solve these Related Problems:

Write a Java program to copy the contents of one TreeMap to another using putAll() and then verify the copied map.
Write a Java program to clone a TreeMap using the clone() method and compare the original and cloned maps for equality.
Write a Java program to perform a deep copy of a TreeMap containing mutable objects and then modify the clone without affecting the original.
Write a Java program to use Java streams to copy TreeMap entries to a new TreeMap and print the result.

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Java Code Editor:

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