Question

How to create a HashSet of strings in Java

Answer 1

package javaapplication1;

import java.util.HashSet;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            HashSet<String> hash = new HashSet<>();
            hash.add("java");
            hash.add("c");
            hash.add("c++"); 
            hash.add("c++");
            hash.add("php");

            System.out.println("size: " + hash.size());

            if (hash.contains("java"))
                System.out.println("yes");
            else
                System.out.println("no");
            
            if (hash.contains("c++"))
                System.out.println("yes");
            else
                System.out.println("no");
            
            if (hash.contains("python"))
                System.out.println("yes");
            else
                System.out.println("no");

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}

/*
             
run:

size: 4
yes
yes
no
    
 */

 

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