Question

How to convert a Set to List in Java

Answer 1

import java.util.*; 

public class MyClass {
    public static <T> List<T> convertSetToList(Set<T> set) { 
        List<T> list = new ArrayList<>(); 
  
        for (T t : set) 
            list.add(t); 

        return list; 
    } 
    public static void main(String args[]) {
        Set<String> hset = new HashSet<String>(); 
 
        hset.add("java"); 
        hset.add("c++"); 
        hset.add("php"); 
        hset.add("nodejs"); 
        hset.add("python"); 

		List<String> list = convertSetToList(hset); 

		System.out.println(list);
    }
}
 
 
 
/*
run:
 
[c++, python, java, php, nodejs]
 
*/

 

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Answer 2

import java.util.*; 
import java.util.stream.Collectors;

public class MyClass {
    public static <T> List<T> convertSetToList(Set<T> set) { 
        return set.stream().collect(Collectors.toList());
    } 
    public static void main(String args[]) {
        Set<String> hset = new HashSet<String>(); 
 
        hset.add("java"); 
        hset.add("c++"); 
        hset.add("php"); 
        hset.add("nodejs"); 
        hset.add("python"); 

		List<String> list = convertSetToList(hset); 

		System.out.println(list);
    }
}
 
 
 
/*
run:
 
[c++, python, java, php, nodejs]
 
*/

 

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Answer 3

import java.util.*; 

public class MyClass {
    public static <T> List<T> convertSetToList(Set<T> set) { 
        return new ArrayList<>(set); 
    } 
    public static void main(String args[]) {
        Set<String> hset = new HashSet<String>(); 
 
        hset.add("java"); 
        hset.add("c++"); 
        hset.add("php"); 
        hset.add("nodejs"); 
        hset.add("python"); 

		List<String> list = convertSetToList(hset); 

		System.out.println(list);
    }
}
 
 
 
/*
run:
 
[c++, python, java, php, nodejs]
 
*/

 

70+ SQL courses for beginners and professionals