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Program: How to search a value in TreeMap?


Description:

Below example shows how to find out whether a specific value exists in the TreeMap or not. By using containsValue() method you can find out value presence in the TreeMap.


Code:
package com.java2novice.treemap;

import java.util.TreeMap;

public class MyTreeMapValueSearch {

	public static void main(String a[]){
		TreeMap<String, String> hm = new TreeMap<String, String>();
		//add key-value pair to TreeMap
		hm.put("first", "FIRST INSERTED");
		hm.put("second", "SECOND INSERTED");
		hm.put("third","THIRD INSERTED");
		System.out.println(hm);
		if(hm.containsValue("SECOND INSERTED")){
			System.out.println("The TreeMap contains value SECOND INSERTED");
		} else {
			System.out.println("The TreeMap does not contains value SECOND INSERTED");
		}
		if(hm.containsValue("first")){
			System.out.println("The TreeMap contains value first");
		} else {
			System.out.println("The TreeMap does not contains value first");
		}
	}
}

Output:
{first=FIRST INSERTED, second=SECOND INSERTED, third=THIRD INSERTED}
The TreeMap contains value SECOND INSERTED
The TreeMap does not contains value first
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List Of All TreeMap Sample Programs:

  1. Basic TreeMap Operations.
  2. How to iterate through TreeMap?
  3. How to copy Map content to another TreeMap?
  4. How to search a key in TreeMap?
  5. How to search a value in TreeMap?
  6. How to get all keys from TreeMap?
  7. How to get entry set from TreeMap?
  8. How to delete all elements from TreeMap?
  9. How to sort keys in TreeMap by using Comparator?
  10. How to sort keys in TreeMap by using Comparator with user define objects?
  11. How to get sorted sub-map from TreeMap?
  12. How to get first key element from TreeMap (Sorted Map)?
  13. How to get last key element from TreeMap (Sorted Map)?
  14. How to reverse sorted keys in a TreeMap?
Knowledge Centre
What is adapter class?
An adapter class provides the default implementation of all methods in an event listener interface. Adapter classes are very useful when you want to process only few of the events that are handled by a particular event listener interface. You can define a new class by extending one of the adapter classes and implement only those events relevant to you.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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