Question

How to initialize HashSet by construction in Java

Answer 1

import java.util.Set;
import java.util.Arrays;
import java.util.HashSet;

public class MyClass {

    public static void main(String args[]) {
         
        Set<String> hs = new HashSet<>(Arrays.asList("a", "b", "c", "d"));

        System.out.println(hs);
    }
}
 
 
 
 
/*
run:
 
[a, b, c, d]
 
*/

 

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Answer 2

import java.util.Set;
import java.util.Arrays;
import java.util.HashSet;

public class MyClass {

    public static void main(String args[]) {
         
        final String[] array = new String[] { "a", "b", "c", "d" };
        final Set<String> hs = new HashSet<>(Arrays.asList(array));
        
        System.out.println(hs);
    }
}
 
 
 
 
/*
run:
 
[a, b, c, d]
 
*/

 

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