Java Algorithms Sort Bubble Sort

import java.util.Arrays;
public class Main {
   public static void bubbleSort(Integer[] arr) {
      int j = 0;/*from   ww  w .ja v  a  2 s .c o  m*/
      Integer tmp;
      boolean sorted = false;
      while (!sorted) {
         sorted = true;
         j++;
         for (int i = 0; i < arr.length - j; i++) {
            if (arr[i].compareTo(arr[i + 1]) > 0) {
               tmp = arr[i];
               arr[i] = arr[i + 1];
               arr[i + 1] = tmp;
               sorted = false;
            }
         }
      }
   }
   public static void main(String[] args) {
      Integer[] myArray = { 15, 21, 17, 31, 19 };
      bubbleSort(myArray);
      System.out.println(Arrays.toString(myArray));
   }
}

class MyArray {//from   w w w .  j a v  a2s  .  c  o  m
   private long[] a;
   private int nElems;

   public MyArray(int max) {
      a = new long[max]; // create the array
      nElems = 0; // no items yet
   }

   public void insert(long value) {
      a[nElems] = value;
      nElems++;
   }

   public void display() {
      for (int j = 0; j < nElems; j++)
         System.out.print(a[j] + " ");
      System.out.println("");
   }

   public void bubbleSort() {
      int out, in;

      for (out = nElems - 1; out > 1; out--) // outer loop (backward)
         for (in = 0; in < out; in++) // inner loop (forward)
            if (a[in] > a[in + 1]) // out of order?
               swap(in, in + 1); // swap them
   }

   private void swap(int one, int two) {
      long temp = a[one];
      a[one] = a[two];
      a[two] = temp;
   }

}

public class Main {
   public static void main(String[] args) {
      int maxSize = 100; // array size
      MyArray arr = new MyArray(maxSize); // create the array

      arr.insert(7);
      arr.insert(9);
      arr.insert(4);
      arr.insert(5);
      arr.insert(2);
      arr.insert(8);
      arr.insert(1);
      arr.insert(0);
      arr.insert(6);
      arr.insert(3);

      arr.display(); // display items

      arr.bubbleSort(); // bubble sort them

      arr.display(); // display them again
   }
}