StringBuffer.reverse();

public class MainClass {
  public static void main(String args[]) {
    StringBuffer sb1 = new StringBuffer("abcde");
    sb1.append("abcdefghij");
    StringBuffer sb2 = sb1.reverse();
    System.out.println(sb1);
    System.out.println(sb2);
  }
}

Why the fuck is jihgfedcbaedcba also being assigned to sb1?

>>3
It's what we call a destructive function. It just happens to return a reference to the object itself, so that you can chain stuff like ".toUpper().reverse()" and such.