public class Test {
  public static void main(String[] args) {
    int []a = {42};
    int []b = {42};
    System.out.println(a.hashCode());
    System.out.println(b.hashCode());
    System.out.println("--- 8< ---");
    java.util.Map<String,String> c = new java.util.HashMap<String, String>();
    c.put("foo", "bar");
    java.util.Map<String,String> d = new java.util.HashMap<String, String>();
    d.put("foo", "bar");
    System.out.println(c.hashCode());
    System.out.println(d.hashCode());
    System.out.println("--- 8< ---");
  }
}

javac Test.java && java Test
2018699554
1311053135
--- 8< ---
61653
61653
--- 8< ---