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class CastAway {
  public static void main(String[] args) {
    int i = 128;
    workWith(i);
  }

  public static void workWith(int i) {
    byte b = (byte) i;  // b has value -128
    // work with b
  }
}

class CastAway {
  public static void workWith(int i) {
    //check if i is within byte range
    if ((i < Byte.MIN_VALUE) || (i > Byte.MAX_VALUE)) { 
      throw new ArithmeticException("Value is out of range");
    }

    byte b = (byte) i;
    // work with b
  } 
}