how to append to an array in java

 public static int[] addX(int n, int arr[], int x) 
    { 
        int i; 
  
        // create a new array of size n+1 
        int newarr[] = new int[n + 1]; 
  
        // insert the elements from 
        // the old array into the new array 
        // insert all elements till n 
        // then insert x at n+1 
        for (i = 0; i < n; i++) 
            newarr[i] = arr[i]; 
  
        newarr[n] = x; 
  
        return newarr; 
    } 
List<type> arr;
arr.add("value");