gistfile1.java

public class ObjectsAndEquals
{
  public static void main(String[] args)
  {
    Integer m0 = 127;
    Integer m1 = 127;
    System.out.println(m0 == m1);               // true
    System.out.println(m0.equals(m1));          // true

    Integer n0 = 128;
    Integer n1 = 128;
    System.out.println(n0 == n1);               // false
    System.out.println(n0.equals(n1));          // true


    System.out.println(n0 == 128);              // true
    System.out.println(128 == n0);              // true
    System.out.println(n0.equals(128));         // true

    System.out.println((m0+1) == n1);           // true
    System.out.println((Integer)(m0+1) == n1);  // false
  }
}

Line 12 is boggling.

haha and line 20 even more