Java: Associate the specified value with the specified key in a TreeMap

Last update on May 23 2025 13:08:54 (UTC/GMT +8 hours)

1. Associate Value with Key in TreeMap

Write a Java program to associate the specified value with the specified key in a Tree Map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example1 {  
  public static void main(String args[]){  
   // Create a tree map
   TreeMap<Integer,String> tree_map=new TreeMap<Integer,String>();      
  // Put elements to the map 
  tree_map.put(1, "Red");
  tree_map.put(2, "Green");
  tree_map.put(3, "Black");
  tree_map.put(4, "White");
  tree_map.put(5, "Blue");
    
   for (Map.Entry<Integer,String> entry : tree_map.entrySet())
   {
    System.out.println(entry.getKey() + "=>" + entry.getValue());
   }
 }  
}

Sample Output:

1=>Red                                                                 
2=>Green                                                               
3=>Black                                                               
4=>White                                                               
5=>Blue

For more Practice: Solve these Related Problems:

• Write a Java program to insert a key-value pair into a TreeMap and update the value if the key already exists.
• Write a Java program to merge two TreeMaps such that if duplicate keys occur, their values are concatenated.
• Write a Java program to add a key-value pair into a TreeMap and then remove it if the value meets a specific condition.
• Write a Java program to use the compute() method in a TreeMap to update a key’s value based on its current value.

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