Program to remove duplicate numbers

Write a program to remove duplicate numbers from given array.

public class RemoveDuplicateNumbers {

  public static void main(String a[]){
         int[] input1 = {2,3,6,6,8,9,10,10,10,12,12};
         int[] output = removeDuplicates(input1);
         for(int i:output){
             System.out.print(i+" ");
         }
     }

 private static int[] removeDuplicates(int[] input) {
   int j = 0;
         int i = 1;
         //return if the array length is less than 2
         if(input.length < 2){
             return input;
         }
         while(i < input.length){
             if(input[i] == input[j]){
                 i++;
             }else{
                 input[++j] = input[i++];
             }    
         }
         int[] op = new int[j+1];
         for(int k=0; k<op.length; k++){
             op[k] = input[k];
         }
         return op;
 }
}

Write a program to remove duplicate characters from array

public class RemoveDuplicateChars {

 public static void main(String[] args) {
  char c[]={'a','b','g','c','d','e','a','f','c','g'};
  RemoveDuplicateChars obj = new RemoveDuplicateChars();
  obj.method1(c);
 }

 public void method1(char a[]) {
  String s=new String(a);
  String temp="";
  for(int i=0;i<s.length();i++) {
   String s1=s.substring(i, i+1);
   if(temp.contains(s1)) {
    continue;
   } else {
    temp+=s1;
   }
  }
  System.out.println(temp);
 }
}