MIDTERM JAVA

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

When a character is stored in memory, it is actually the __________ that is stored.

Unicode number

A runtime error is usually the result of

a logical error

A computer program is

a set of instructions that allow the computer to solve a problem or perform a task

RAM is usually

a set of instructions that allow the computer to solve a problem or perform a task

Java requires that the boolean expression being tested by an if statement be enclosed in

a set of parentheses

What is the following statement an example of? import java.util.*;

a wildcard import statement

What will be displayed after the following statements are executed? int x = 65; int y = 55; if (x >= y) { int ans = x + y; } System.out.println(ans);

120

What will be the value of x after the following statements are executed? int x = 75; int y = 60; if (x > y) x = x - y;

15

What will be displayed after the following statements are executed? int y = 10; if (y == 10) { int x = 30; x += y; System.out.println(x); }

40

There are __________ bits in a byte.

8

Which of the following is not part of the programming process?

All of these are parts of the programming process

__________ refers to the physical components that a computer is made of

Hardware

The original name for Java was

OAK

"Shadowing" is the term used to describe how the field name is hidden by the name of a local or parameter variable.

TRUE

A constructor is a method that is automatically called when an object is created.

TRUE

A method that stores a value in a class's field or in some other way changes the value of a field is known as a mutator method.

TRUE

A procedure is a set of programming language statements that, together, perform a specific task.

TRUE

A solid-state drive has no moving parts and operates faster than a traditional disk drive.

TRUE

All it takes for an OR expression to be true is for one of the subexpressions to be true.

TRUE

An access specifier indicates how a class may be accessed.

TRUE

An important style rule that should be used when writing if statements is to write the conditionally executed statement on the line after the if statement.

TRUE

Application software refers to programs that make the computer useful to the user

TRUE

Each byte is assigned a unique number known as an address

TRUE

Encapsulation refers to the combining of data and code into a single object

TRUE

If the expression on the left side of the && operator is false, the expression on the right side will not be checked.

TRUE

Logical errors are mistakes that cause the program to produce erroneous results

TRUE

The Java Virtual Machine is a program that reads Java byte code instructions and executes them as they are read.

TRUE

The if-else statement will execute one group of statements if its boolean expression is true or another group if its boolean expression is false.

TRUE

The java.lang package is automatically imported into all Java programs.

TRUE

The term "no-arg constructor" is applied to any constructor that does not accept arguments.

TRUE

The boolean expression in an if statement must evaluate to

true or false

Because Java byte code is the same on all computers, compiled Java programs

are highly portable

It is common practice in object-oriented programming to make all of a class's

fields private

A __________ is a boolean variable that signals when some condition exists in the program.

flag

Which of the following expressions will generate a random number in the range of 1 through 10?

myNumber = randomNumbers.nextInt(10) + 1;

If str1 and str2 are both String objects, which of the following expressions will correctly determine whether or not they are equal?

str1.equals(str2)

Variables are

symbolic names made up by the programmer that represent memory locations

The data contained in an object is known as

the attributes

The central processing unit (CPU) consists of two parts which are

the control unit and the arithmetic and logic unit (ALU)

To indicate the data type of a variable in a UML diagram you specify

the variable name followed by a colon and the data type

The two primary methods of programming in use today are

procedural and object-oriented

While __________ is centered on creating procedures, __________ is centered on creating objects.

procedural programming, object-oriented programming

A set of programming language statements that perform a specific task is a(n)

procedure

Computers can do many different jobs because they are

programmable

A(n) __________ is used to write computer programs.

programming language

Software refers to

programs

A cross between human language and a programming language is called

pseudocode

One type of design tool used by programmers when creating a model of a program is

pseudocode

looking at the following code waht is wrong with line 7 public class NumericTypes 1. { 2. public static void main (String [] args) 3. { //TASK #2 Create a Scanner object here (not used for alternate) 4. //identifier declarations 5. final int NUMBER = 2 ; // number of scores 6. final int SCORE1 = 100; // first test score 7. final int SCORE2 = 95; /* second test score */

/ missing

looking at the following code which line is wrong if any? If none put 0. public class NumericTypes 1. { 2. public static void main (String [] args) 3. { //TASK #2 Create a Scanner object here (not used for alternate) 4. //identifier declarations 5. final int NUMBER = 2 ; // number of scores 6. final int SCORE1 = 100; // first test score 7. final int SCORE2 = 95; /* second test score */

0

What will be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 100; if (purchase > 1000) discountRate = 0.05; else if (purchase > 750) discountRate = 0.03; else if (purchase > 500) discountRate = 0.01;

0.0

What will be the value of discountRate after the following statements are executed? double discountRate; char custType = 'B'; switch (custType) { case 'A': discountRate = 0.08; break; case 'B': discountRate = 0.06; case 'C': discountRate = 0.04; default: discountRate = 0.0; }

0.0

What will be the value of discountRate after the following statements are executed? double discountRate = 0.0; int purchase = 1250; char cust = 'N'; if (purchase > 1000) if (cust == 'Y') discountRate = 0.05; else discountRate = 0.04; else if (purchase > 750) if (cust == 'Y') discountRate = 0.04; else discountRate = 0.03; else discountRate = 0.0;

0.04

What will be the value of bonus after the following statements are executed? int bonus, sales = 10000; if (sales < 5000) bonus = 200; else if (sales < 7500) bonus = 500; else if (sales < 10000) bonus = 750; else if (sales < 20000) bonus = 1000; else bonus = 1250;

1000

What will be the value of x after the following statements are executed? int x = 10; switch (x) { case 10: x += 15; case 12: x -= 5; break; default: x *= 3; }

20

What will be displayed after the following statements are executed? int hours = 30; double pay, payRate = 10.00; pay = hours <= 40 ? hours*payRate : hours*payRate*2.0; System.out.println(pay);

300.0

looking at the following code which line is wrong public class NumericTypes 1. { 2. public static void main (String [] args) 3. { //TASK #2 Create a Scanner object here (not used for alternate) 4. //identifier declarations 5. final float NUMBER = 2 ; // number of scores 6. final int SCORE1 = 100; // first test score 7. final int SCORE2 = 95; /* second test score */

5

A method that gets a value from a class's field but does not change it is known as a mutator method.

FALSE

A random number, created as an object of the Random class, is always an integer.

FALSE

All it takes for an AND expression to be true is for one of the subexpressions to be true.

FALSE

Colons are used to indicate the end of a Java statement

FALSE

Compiled byte code is also called source code

FALSE

In a switch statement, if two different values for the CaseExpression would result in the same code being executed, you must have two copies of the code, one after each CaseExpression.

FALSE

Java source files end with the .class extension

FALSE

The DecimalFormat class is part of the Java API so it is automatically available to your programs.

FALSE

The public access specifier for a field indicates that the field may not be accessed by statements outside the class.

FALSE

The term "default constructor" is applied to the first constructor written by the author of the class.

FALSE

When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable.

FALSE

What will be the value of ans after the following statements are executed? int x = 40; int y = 40; if (x = y) ans = x + 10;

The code contains an error and will not compile

For the following code, which statement is not true? public class Sphere { private double radius; public double x; private double y; private double z; }

The z field is available to code written outside the Sphere class.

Which of the following is not involved in identifying the classes to be used when developing an object-oriented application?

Write the code.

Enclosing a group of statements inside a set of braces creates

a block of statements

What is the following statement an example of? import java.util.Scanner;

an explicit import statement

What will be the values of ans, x, and y after the following statements are executed? int ans = 35, x = 50, y = 50; if (x >= y) { ans = x + 10; x -= y; } else { ans = y + 10; y += x; }

ans = 60, x = 0, and y = 50

If you do not provide initialization values for a class's numeric fields, they will

be automatically initialized to 0

One or more objects may be created from a(n)

class

A characteristic of __________ is that only an object's methods are able to directly access and make changes to an object's data

data hiding

A constructor

has the same name as the class

The __________ statement is used to create a decision structure which allows a program to have more than one path of execution.

if

When an object is created, the attributes associated with the object are called

instance fields

Methods that operate on an object's fields are called

instance methods

Which of the following commands will run the compiled Java program named DoItNow?

java DoItNow

Validating the results of a program is important to

make sure the program solves the original problem

Assume you are at the operating system command line and want to use the following command to compile a program: javac MyClass.java Before entering the command you mus

make sure you are in the same directory or folder where the MyClass.java file is located

A(n) __________ is a software entity that contains data and procedures.

object

Using the blueprint/house analogy, you can think of a class as a blueprint that describes a house and __________ as instances of the house built from the blueprint.

objects

A constructor is a method that

performs initialization or setup operations

Byte code instructions are

read and interpreted by the JVM

looking at the following code waht is wrong with line 7 public class NumericTypes 1. { 2. public static void main (String [] args) 3. { //TASK #2 Create a Scanner object here (not used for alternate) 4. //identifier declarations 5. final int NUMBER = 2 ; // number of scores 6. final int SCORE1 = 100; // first test score 7. final int SCORE2 = 95 // second test score

semi-colon missing

The end of a Java statement is indicated by a ________.

semicolon (;)

The scope of a local variable is

the method in which it is defined

An object typically hides its data but allows outside code access to

the methods that operate on the data

When an argument is passed by value

the parameter variable holds the address of the argument

Application software refers to

the programs that make the computer useful to the user

What is syntax?

the rules that must be followed when writing a program

In an if-else statement, if the boolean expression is false

the statement or block following the else is executed

Key words are

words that have a special meaning in the programming language

Which of the following expressions will determine whether x is less than or equal to y?

x <= y


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