COSC 251 - Final Review

Java Basics

100

True or False: A benefit of using an IDE is your code complies and runs faster.

false

200

Java's syntax is similar to the syntax of what language(s)?

C++ and C#

300

The source files for a project can be organized into one or more _____.

Packages

400

One of the primary benefits of a typical IDE for Java is that it checks the ________________ of your code as you enter it so you make fewer entry errors.

Syntax

500

The Java compiler takes the source code for an application and translates it into ______.

bytecodes

Classes & Methods

100

What does the following statement do in a Java application?

import java.util.Scanner;

It makes the Scanner class available to the application without qualification.

200

You can use the nextLine method of the Scanner object to do what?

return all text on the current line as a String object

300

A Boolean expression is an expression that returns a ________________ value.

True or False

400

When you use a constructor to create an object from a Java class, you are creating a/an ________________ of the class.

instance

500

You call a/an ________________ from an object.

method

control statements

100

In a while loop, the Boolean expression is tested when?

before the loop is executed

200

You can use a logical operator to do what?

combine two Boolean expressions

determine if two expressions are equal

300

The difference between a if/else and a switch statements is what? 

It can’t perform an operation based on the result of a Boolean expression

400

How many lines are printed on the console when the following for loop is executed?

for (int i = 2; i < 10; i++) {

    System.out.println(i);

}

8

500

What is the value of x after the following statements are executed?

int x = 5;

switch(x) {

    case 5: 

        x += 2;

        break;

    case 6:

        x++;

        break;

    default:

        x *= 2;

        break;

}

7

Random

100

To join (or concatenate) one string with another string or another data type, you can use the ________________ operator.

+

200

To append a string or another data type to a string, you can use the ________________ operator.

+=

300

    You can use the final keyword to do what?

to prevent a class from being inherited

to prevent a method from being overridden

to prevent a method from assigning a new value to a parameter

400

What keyword do you use in a class declaration to create a subclass?

extends

500

What class or classes is a variable available to if it is declared without an access modifier?

All classes in the same package

Arrays/Array Lists

100

The array that follows is an array of

double[] grades = new double[3];

double values

200

What is the value of names[4] in the following array?

String[] names = {"Jeff", "Dan", "Sally", "Jill", "Allie"};

Allie

300

To refer to an element in an array you use a/an ____________.

index

400

Which of the following is a difference between arrays and collections?

Collections can grow in size, but arrays can’t.

Arrays can store unwrapped primitive types, but collections can’t.

Collections are created from classes, but arrays aren’t.

500

What is the value of m after the code that follows is executed?

ArrayList<Double> miles = new ArrayList<>();

miles.add(37.5);

miles.add(26.2);

miles.add(54.7);

double m = miles.remove(0);

37.5