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Java Program to check if a particular key exists in TreeMap
To check if a particular key exists in TreeMap, use the containsKey() method.
Create a TreeMap first and add some elements −
TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"PHP"); m.put(2,"jQuery"); m.put(3,"JavaScript"); m.put(4,"Ruby"); m.put(5,"Java"); m.put(6,"AngularJS"); m.put(7,"ExpressJS");
Now, let’s say we need to check that key 5 exists or not. For that, set the containsKey() method like this −
m.containsKey(5)
The following is an example to check if a particular key exists in TreeMap −
Example
import java.util.*; public class Demo { public static void main(String args[]) { TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"PHP"); m.put(2,"jQuery"); m.put(3,"JavaScript"); m.put(4,"Ruby"); m.put(5,"Java"); m.put(6,"AngularJS"); m.put(7,"ExpressJS"); System.out.println("TreeMap Elements...
"+m); System.out.println("Does key 5 exist in the TreeMap = "+m.containsKey(5)); } }
Output
TreeMap Elements... {1=PHP, 2=jQuery, 3=JavaScript, 4=Ruby, 5=Java, 6=AngularJS, 7=ExpressJS} Does key 5 exist in the TreeMap = true
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