Effective Java snippets

HashCodeUniversal.java

@Override 
public int hashCode(){
  int result = 17;
  result = 31 * result + someBoolean ? 1:0;
  result = 31 * result + someByte;
  result = 31 * result + someChar;
  result = 31 * result + someShort;
  result = 31 * result + someInt;
  result = 31 * result + someLong ^ someLong >>> 32 ;
  result = 31 * result + Float.floatToIntBits(someFloat);
  long doubles = Double.doubleToLongBits(someFloat);
  result = 31 * result + doubles ^ doubles >>> 32;
  return result;
}