Question

How to convert List to Set in Java

Answer 1

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

public class MyClass {
    public static void main(String args[]) throws Exception {  
        List<String> list = Arrays.asList("java", "php", "c", "c++"); 
   
        Set<String> set = new HashSet<>(list); 
   
        System.out.println(set);
    }
}

 
 
 
 
/*
run:
   
[c++, java, c, php]
   
*/

 

70+ SQL courses for beginners and professionals

Answer 2

import java.util.Set;
import java.util.List;
import java.util.Arrays;
import java.util.stream.Collectors; 

public class MyClass {
    public static void main(String args[]) throws Exception {  
        List<String> list = Arrays.asList("java", "php", "c", "c++"); 
   
        Set<String> set = list.stream().collect(Collectors.toSet());
   
        System.out.println(set);
    }
}

 
 
 
 
/*
run:
   
[c++, java, c, php]
   
*/

 

70+ SQL courses for beginners and professionals

Answer 3

import java.util.Set;
import java.util.List;
import java.util.HashSet;

public class MyClass {
    public static void main(String args[]) throws Exception {  
        List<String> list = List.of("java", "c", "python");
        
        Set<String> set = new HashSet<>(list);
        
        System.out.println(set); 
    }
}

 
 
 
 
/*
run:
   
[python, java, c]
   
*/

 

70+ SQL courses for beginners and professionals