Here is an example that store some integers into an array and find the occurrence of each number from the array.

import java.util.*;

public class SearchNumberOccurrence {
        public static void searchAndDisplay(int[] arr) {
                ArrayList<Integer> list1 = new ArrayList<Integer>();
                ArrayList<Integer> list2 = new ArrayList<Integer>();
                for (int element : arr) {
                        int index = list1.indexOf(element);
                        if (index != -1) {
                                int newCount = list2.get(index) + 1;
                                list2.set(index, newCount);
                        } else {
                                list1.add(element);
                                list2.add(1);
                        }
                }
                for (int i = 0; i < list1.size(); i++) {
                        System.out.println("Number " + list1.get(i) + " occurs "+ list2.get(i) + " times");

                }
              }

        public static void main(String[] args) {
                Scanner input = new Scanner(System.in);
                int[] arr = {1,2,3,4,3,5,5,6,6};
                searchAndDisplay(arr);
        }
}