Java list deduplication with one line of code

Java list deduplication with one line of code
Unsupported Syntax 1. No type Syntax:

List listWithoutDup = new ArrayList(new HashSet(listWithDup));

2. Write the String type ):
1) Java 7:

List
 
   listWithoutDup = new ArrayList
  
   (new HashSet
   
    (listWithDup));
   
  
 

2) Java 7 and above:

List
 
   listWithoutDup = new ArrayList<>(new HashSet<>(listWithDup));
 

Example:

import java.util.ArrayList;import java.util.HashSet;import java.util.List;public class Test {public static void main(String[] args) {List
 
   listWithDup = new ArrayList
  
   ();listWithDup.add("1");listWithDup.add("2");listWithDup.add("3");listWithDup.add("1");List
   
     listWithoutDup = new ArrayList
    
     (new HashSet
     
      (listWithDup));System.out.println("list with dup:"+ listWithDup);System.out.println("list without dup:"+ listWithoutDup);}}
     
    
   
  
 

Sample running result: list with dup: [1, 2, 3, 1]
List without dup: [3, 2, 1]