Java: Remove Duplicates from List : For-Loop #java

usingForLoop.java

public static void usingForLoop(){
List<Integer> input = Arrays.asList(5,10,15,20,10,5,35,40,10,25);
List<Integer> output = new ArrayList<Integer>();
for(Integer num:input){
if(!output.contains(num)){
  		output.add(num);
  		}
}
for(Integer num:output){
  		System.out.print(num+" ");
 	}
}