Java: Delete all elements from a given Tree Map

Last update on May 23 2025 13:08:51 (UTC/GMT +8 hours)

6. Delete All Elements from TreeMap

Write a Java program to delete all elements from a Tree Map.

Sample Solution:-

Java Code:

import java.util.*;
import java.util.Map.Entry;  
public class Example6 {  
    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"); 
    
  System.out.println("Orginal TreeMap content: "+tree_map1);
  tree_map1.clear();
  System.out.println("The New map: "+tree_map1);
 }
}

Sample Output:

Orginal TreeMap content: {C1=Red, C2=Green, C3=Black, C4=White}        
The New map: {}

For more Practice: Solve these Related Problems:

Write a Java program to clear a TreeMap using the clear() method and verify that its size is zero.
Write a Java program to remove all elements from a TreeMap using remove() in a loop and then print the empty map.
Write a Java program to reinitialize a TreeMap by assigning it to a new instance and compare it with the old map.
Write a Java program to use Java streams to filter out all entries and collect an empty map from a TreeMap.

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Java Code Editor:

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