Removing duplicate elements from a List

Question

I have developed an array list.

ArrayList list = new ArrayList();

list.add(\"1\");
list.add(\"2\");
list.add(\"3\");
list.add(\"         


        

Answer 1

Here are some way you can achieve this.

Using Java 8:

List distinctLambda=originalList.stream()
           .distinct().collect(Collectors.toList());
 System.out.println(distinctLambda);

Using Set:

Set distinctSet=new HashSet<>(originalList);
        System.out.println(distinctSet);

Normal for loop:

List distinctNewList=new ArrayList<>();
        for (String temp:originalList) {
            if(distinctNewList.size()==0){
                distinctNewList.add(temp);
                continue;
            }

            if(!distinctNewList.contains(temp)){
                distinctNewList.add(temp);
            }
        }

        System.out.println(distinctNewList);

Here is your data set:

ArrayList originalList = new ArrayList<>();
        originalList.add("1");
        originalList.add("2");
        originalList.add("3");
        originalList.add("3");
        originalList.add("5");
        originalList.add("6");
        originalList.add("7");
        originalList.add("7");
        originalList.add("1");
        originalList.add("10");
        originalList.add("2");
        originalList.add("12");