Exam 3: Implementing Classes

Fill in the blank in the comment for this method header. /** Gets the interest for the bank account _________________________________ */ Public double getInterest() ) . .

Given the following constructor for the BankAccount class, what output is generated by a call to new BankAccount()? Public BankAccount() { System.out.println(balance); }

What contains the instructions to initialize the instance variables of an object?

Consider the following method header for an Employee class: public void raiseSalary(double percentRaise) { ______________________________________ } Fill in the blank in the method body:

Information hiding makes it simpler for the implementor of a class to _____.

What statement is used to specify the value that a method gives back to its caller?

The use of an instance variable name inside a method denotes the instance variable of what?

When you declare a method, you also need to provide the method ____, which consists of statements that are executed when the method is called.

If the CarComponent class had the call below added to it, where will car3 be placed? Int y3 = (getHeight() - 30)/2; Car car3 = new Car(0, y3); Car3.draw(g2);

We want to create a class that represents a geometric sequence. A geometric sequence is a sequence of numbers that begin at some value and then multiplies each value by some constant to get the next value. For example, the geometric sequence 1, 2, 4, 8, 16 starts at 1 and multiplies each term by 2 to get the next. The geometric sequence 10.8, 5.4, 2.7, 1.35 starts at 10.8 and multiplies each term by 0.5 to get the next. The basic framework of a geometric sequence class is below: public class GeometricSequence { Private double initialValue; Private double multiplier; } We want to produce elements of the geometric sequence using codeSystem.out.println (first.next()); // Prints 1 and advances System.out.println (first.next()); // Prints 2 and advances System.out.println (first.next()); // Prints 4 and advances System.out.println (first.next()); // Prints 8 and advances System.out.println (second.next()); //Prints 10.8 and advances System.out.println (second.next()); //Prints 5.4 and advances System.out.println (second.next()); //Prints 2.7 and advances What should the body of the next method be?

We want to create a class that represents a date. A date has a day, month, and year. For example, the date March 16, 2014 has the day 16, month 3, and year 2014. The basic framework of a date class is below: public class Date { Private int day; Private int month; Private int year; } What should the body of the constructor be?

Identify the explicit parameter of the withdraw method of the BankAccount class.

What does an object store its data in?

Consider the following method header for the BankAccount class: public void addInterest(double rate) { ______________________________________ } Fill in the blank in the method body.

We want to create a class that represents a geometric sequence. A geometric sequence is a sequence of numbers that begin at some value and then multiplies each value by some constant to get the next value. For example, the geometric sequence 1, 2, 4, 8, 16 starts at 1 and multiplies each term by 2 to get the next. The geometric sequence 10.8, 5.4, 2.7, 1.35 starts at 10.8 and multiplies each term by 0.5 to get the next. The basic framework of a geometric sequence class is below: public class GeometricSequence { Private double initialValue; Private double multiplier; } We want to create a geometric sequence using code like: GeometricSequence first = new GeometricSequence (1, 2); // Creates 1, 2, 4, 8, 16… GeometricSequence second = new GeometricSequence (10.8, 0.5); // Creates 10.8, 5.4, 2.7, 1.35 … Which of the constructor specifications below will allow this code to behave as desired?

Choose the method header that goes with this method comment. /** Raises the salary of the employee @param percentRaise salary percentage raise */

When are local variables initialized?

Instance variables that are object references are initialized to what default value?

Assume the method below has been added to the BankAccount class. public void transfer (BankAccount source, double amount) { Balance = balance + amount; Source.balance = source.balance - amount; } What will be output from the following statements that use the revised BankAccount class? BankAccount first = new BankAccount (100.0); BankAccount second = new BankAccount (300.0); First.transfer (second, 50.0); System.out.println (first.getBalance() + " " + second.getBalance());

We want to create a class that represents a date. A date has a day, month, and year. For example, the date March 16, 2014 has the day 16, month 3, and year 2014. The basic framework of a date class is below: public class Date { Private int day; Private int month; Private int year; } The default date will be set to January 1, 1990. What should the body of the constructor with zero parameters be?