AP Exam Review

Java reserved words

100

Stop _______ me!

boolean

200

This keyword is used to make a class be a subclass of another class

extends

300

Use this type of structure when you know the number of iterations

for

400

Use this keyword when you need to use a class from a Java package other than java.lang

import

500

Nice ____, but I am going to _____ up with you

try; catch

Conceptual

100

A ___ error is when your program compiles and runs, but doesn't behave the way you intend

Logic

200

What function must you implement in order to implement the Comparable interface, and what does that function return?

compareTo(), int

300

Instance data should typically be declared as ____

private

400

A recursive method must have a _____

Base case

500

A non-abstract subclass of an abstract class must ______

Implement all abstract methods in the superclass

Methods

100

This returns a String representation of an object

toString()

200

The function that is automatically called when a program is run

main()

300

You should compare reference types using this function

equals()

400

This function returns a positive integer, a negative integer, or zero

compareTo()

500

What is the major difference between arrays and ArrayLists?

ArrayLists can grow/shrink as needed

Predefined Classes

100

What class contains functions that allow you to perform trig in Java

Math

200

Write the line of code that will return "Part" using:

String s = "Partial";

s.substring(0, 4);

300

What do we call the set of classes that allow us to treat a primitive value like a reference type?

Wrapper classes

400

This class is a superclass of all classes in Java

Object

500

Describe the return value of:

"have".compareTo("doesn't have");

a positive integer

OOP Concepts

100

Given the following classes:

class A{

public void a(){System.out.print("A");}}

class B extends A {

public void a(){super.a(); System.out.print("B");}

public void b(){System.out.print("B");}}

What is the result of the following code in a client:

A obj = new A();

obj.a();

prints "A"

200

Given the following classes:

class A{

public void a(){System.out.print("A");}}

class B extends A {

public void a(){super.a(); System.out.print("B");}

public void b(){System.out.print("B");}}

What is the result of the following code in a client:

A obj = new B();

obj.b();

error

300

Given the following classes:

class A{

public void a(){System.out.print("A");}}

class B extends A {

public void a(){super.a(); System.out.print("B");}

public void b(){System.out.print("B");}}

What is the result of the following code in a client:

A obj = new A();

obj.b();

error

400

Given the following classes:

class A{

public void a(){System.out.print("A");}}

class B extends A{

public void a(){super.a(); System.out.print("B");}

public void b(){System.out.print("B");}}

What is the result of the following code in a client:

A obj = new B();

obj.a();

prints "AB"

500

The HAS-A relationship refers to what relationship between classes?

Composition