Try It Yourself: ifs and Boolean Expressions Solution

  1.  
    1. Answer: The following code would be inside the Circle class: 
      public boolean contains(Point p) {
	// A point p is inside a circle if the distance between p and the
	// circle's center is less than the radius of the circle.
	return (center.distance(p) < radius);
}
    2. Answer: The following code would be outside the Circle class: 
      boolean isInside(Circle outer, Circle inner) {

	Point outerCenter = outer.getCenter();	// the outer circle's center
	Point innerCenter = inner.getCenter();	// the inner circle's center

	// The inner circle is completely inside the outer circle if:
	// 	distance between centers 
	//		+ 				< 	outer circle's radius
	//	inner circle's radius 		
	return (outerCenter.distance(innerCenter) + inner.getRadius() 
	        < outer.getRadius());
}


  2.  
    public class Date {
	private int month, day, year;  // holds month, day, year for date

	/**
	 * Creates a Date object with the given month, day, and year.  
	 * Invalid arguments are replaced with 0.
	 *
	 * @param m the month (1 <= m <= 12)
	 * @param d the day (1 <= d <= 31)
	 * @param y the year (1000 <= y <= 9999)
	 **/
	public Date(int m, int d, int y) {
		month = m;
		if (month < 1 || month > 12)
			month = 0;
		day = d;
		if (day < 1 || day > 31)
			day = 0;
		year = y;
		if (year < 1000 || year > 9999)
			year = 0;
	}

	/**
	 * Returns the month.
	 * @return the month
	 **/
	public int getMonth() {
		return month;
	}

	/**
	 * Returns the day.
	 * @return the day
	 **/
	public int getDay() {
		return day;
	}

	/**
	 * Returns the year.
	 * @return the year
	 **/
	public int getYear() {
		return year;
	}

	/**
	 * Returns a String representing the date.
	 * @return the date in the format: mm/dd/yyyy
	public String toString() {
		return (month + "/" + day + "/" + year);
	}
}