import java.util.Arrays;
import java.util.LinkedList;

public class Delete2 {
    private static final int LIMIT_ELEMENT = 2;

    public static void main(String args[]) {

        int[] inputArray = {1, 1, 3, 4, 4, 4, 4, 4, 5, 6, 7, 7};

        Arrays.sort(inputArray);

        System.out.println("Source array");
        Arrays.stream(inputArray).forEach(System.out::println);

        LinkedList<Integer> newArray = new LinkedList<>();

        int countOfElement = 1;
        int currentElement = inputArray[1];
        newArray.add(currentElement);

        for (int i=1; i<inputArray.length; i++) {
            if (inputArray[i] != currentElement ) {
                countOfElement = 1;
                currentElement = inputArray[i];
            } else {
                ++countOfElement;
            }

            if (countOfElement<=LIMIT_ELEMENT) {
                newArray.add(currentElement);
            }
        }

        System.out.println("Result");
        newArray.forEach(System.out::println);
    }
}