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About Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Check value existence in TreeMap example

This is an example of how to check a value existence in a TreeMap in Java. Checking if a value exists in a TreeMap implies that you should:

  • Create a new TreeMap.
  • Populate the map with elements, with put(K key, V value) API method of TreeMap.
  • Invoke containsValue(Object value) API method of TreeMap. The method returns true if this map maps one or more keys to the specified value and false otherwise.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;
 
import java.util.TreeMap;
 
public class CheckValueTreeMap {
 
  public static void main(String[] args) {
 
    // Create a TreeMap and populate it with elements
    TreeMap treeMap = new TreeMap();
    treeMap.put("key_1","element_1");
    treeMap.put("key_2","element_2");
    treeMap.put("key_3","element_3");
 
    // boolean containsValue(Object key) returns true if the value is mapped to one or more keys otherwise false.
    boolean exists = treeMap.containsValue("element_2");
    System.out.println("element_2 exists in TreeMap ? : " + exists);
  }
}

Output:

element_2 exists in TreeMap ? : true

 
This was an example of how to check a value existence in a TreeMap in Java.

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