ah.java

// array hash
class ah {
  public static void main (String[] args) {
    int[] a = new int []{1,2,3};
    int[] b = new int []{1,2,3};
    System.out.println ("a hash: " + a.hashCode());
    System.out.println ("b hash: " + b.hashCode());
  }
}

output.txt

$ java ah
a hash: 2018699554
b hash: 1311053135