How to create a set from list in java

We simply need to pass the list into the constructor of HashSet. It will remove all the duplicates from the list.

package com.jts;

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

public class SetFromListExample {
	
	public static void main(String[] args) {
		
		List<Integer> list = new ArrayList<>();
		list.add(101);
		list.add(102);
		list.add(103);
		list.add(101);
		list.add(104);
		list.add(102);
		
		System.out.println("List : " + list);
		
		Set<Integer> set = new HashSet<>(list);
		
		System.out.println("Set : " + set);
	}

}

Output:
List : [101, 102, 103, 101, 104, 102]
Set : [101, 102, 103, 104]

If we want to maintain the same order of elements as list, then we should use LinkedHashSet class instead of HashSet.