Question

How to check if a specific key exists in HashMap in Java

Answer 1

package javaapplication1;

import java.util.HashMap;

public class JavaApplication1 {

    public static void main(String[] args) {

        HashMap hMap = new HashMap();
   
        hMap.put("1", "Java");
        hMap.put("2", "C++");
        hMap.put("3", "C");
        hMap.put("4", "C#");
        hMap.put("5", "PHP");

        boolean b = hMap.containsKey("4");
        System.out.println(b);
  }
}
  
/*
run:

true

*/

 

70+ SQL courses for beginners and professionals