Java EnumMap containsKey() method

The containsKey() method of Java EnumMap class is used to check whether a specified key is present in this map or not. This method returns true if this map contains a mapping for the specified key.

Syntax

Parameters

key - the key whose presence in this map is to be tested

Returns

This method returns true if this map contains a mapping for the specified key.

Exception

Example 1

import java.util.EnumMap;
public class EnumMapContainsKeyExample1 {
    public enum Tutorial {
    Java,Python, PHP,Android,AngularJS
    };
    public static void main(String[] args) {
    EnumMap<Tutorial, String> map =
          new EnumMap<Tutorial, String>(Tutorial.class);
    map.put(Tutorial.Java,"1");
    map.put(Tutorial.Python,"2");
    map.put(Tutorial.PHP,"3");
    map.put(Tutorial.Android,"4");
    map.put(Tutorial.AngularJS,"5");
    System.out.println(map);
    boolean contains = map.containsKey(Tutorial.Java);
    System.out.println("Tutorial.Java has a mapping: "+contains);
    contains = map.containsKey(Tutorial. PHP);
    System.out.println("Tutorial.PHP has a mapping: "+contains);
   }
}

Test it Now

Output:

{Java=1, Python=2, PHP=3, Android=4, AngularJS=5}
Tutorial.Java has a mapping:  true
Tutorial.PHP has a mapping:  true

Example 2

import java.util.EnumMap;
public class EnumMapContainsKeyExample2 {
    // create an enum  
   public enum Days {  
   Monday, Tuesday, Wednesday, Thursday  
   };  
   public static void main(String[] args) {  
   //create and populate enum map  
   EnumMap<Days, String> map = new EnumMap<Days, String>(Days.class);  

   map.put(Days.Monday,"1");  
   map.put(Days.Tuesday,"2");  
   map.put(Days.Wednesday,"3");  
   map.put(Days.Thursday,"4");  
   System.out.println(map);
   boolean contains = map.containsKey(Days.Tuesday);
   System.out.println("Days.Tuesday has a mapping: "+contains);
   contains = map.containsKey(Days. Thursday);
   System.out.println("Days.Thursday has a mapping: "+contains);
  }
}

Test it Now

Output:

{Monday=1, Tuesday=2, Wednesday=3, Thursday=4}
Days.Tuesday has a mapping: true
Days.Thursday has a mapping: true

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Java EnumMap Class