1public static void main(String[] args) {
2
3 String result = removeDup("AAABBBCCC");
4 System.out.println(result); // ABC
5
6public static String removeDup( String str) {
7 String result = "";
8 for (int i = 0; i < str.length(); i++)
9 if (!result.contains("" + str.charAt(i)))
10 result += "" + str.charAt(i);
11 return result;
12 }
13}
1import java.util.*;
2
3public class RemoveDuplicatesFromArrayList {
4
5 public static void main(String[] args) {
6 List<Integer> numbers = Arrays.asList(1,2,2,2,3,5);
7
8 System.out.println(numbers);
9
10 Set<Integer> hashSet = new LinkedHashSet(numbers);
11 ArrayList<Integer> removedDuplicates = new ArrayList(hashSet);
12
13 System.out.println(removedDuplicates);
14 }
15}
16
1public static <T> ArrayList<T> removeDuplicates(ArrayList<T> list){
2 Set<T> set = new LinkedHashSet<>(list);
3 return new ArrayList<T>(set);
4}
1String str2 = "ABABABCDEF";// ABCDEF
2 String[] arr2 = str2.split("");
3str2 = new LinkedHashSet<>(Arrays.asList(arr2)).toString().replace(", ", "");
4 System.out.println(str2); // ABCDEF