Divider3.java

public class Divider {
  public int divide(int dividend, int divisor) {
    if (divisor != null) {
      if(dividend != null) {
        if (divisor != 0) {
          return dividend / divisor;
        } else {
          throw new IllegalArgumentException("divisor must not be 0");
        }
      } else {
        throw new IllegalArgumentException("dividend must not be null");
      }
    }
  }
}