What is an instance of a class?

An object that was created from that class

What does the Scanner class do?

Scanner parses input into tokens

To manipulate a bunch of data as one unit with common code

What is a class member?

The fields and methods in the class

A class method that returns object data

A class method that changes object data

Run the program with diff. values to execute all code blocks

What does API stand for?

Application Programming Interface

What does String.indexOf(String str) do?

Returns the position of 'str' within the String, or -1

What is Object-Oriented Programming?

Combine data and methods to represent specific concepts

What does an Object reference do?

Points to the location in memory of the object

What is the purpose of the 'toString()' method?

Return a String representing the data of the object

What is a class constructor?

A special method that creates the object and sets values

What is a 'unary' operator?

Operator that works on one operand

What is encapsulation?

Keeping some data private, others cannot access it directly

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Combined: Programming 1 Unit 2 + Programming 1 - Unit 1 + Programming 1 Unit 3

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Programming 1 Unit 2: #programming Programming 1 - Unit 1: #PROGRAMMING Programming 1 Unit 3: #programming

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Questions 46

Answers

1
An object can have multiple references to it?
False
True
2
What is an instance of a class?
An object that was created from that class
A value stored in the class object
A method that the class can call
A blueprint of what the class will contain
3
If an object reference does not point to an actual object what is its value?
void
none
absent
null
4
Which of these is NOT an Object Oriented programming language?
Java
Smalltalk
C++
C
5
What does the Scanner class do?
Scanner parses input into tokens
Scanner looks through user input looking for keywords
Scanner reads images as input
Scanner finds errors and viruses in our code
6
Which Boolean expression is valid? a, b, c are ints
a != b < c
a >= b - c
a < b < c
a < b || c
7
What is the valid way to declare an int?
int-a;
int a;
a int;
integer a;
8
Why use classes?
So the peasants don't revolt
To keep the data separate from the methods
To manipulate a bunch of data as one unit with common code
9
What is a class member?
The class declaration
The instances of a class
The fields and methods in the class
The class references
10
How do you compare Strings str1 and str2?
String.equals(str1, str2);
With a for loop
str1 == str2;
str1.equals(str2);
11
Which expression is equivalent to: ( a > 10 || b == c )
!( a < 9 || b != c )
!( a > 10 && b == c)
( a <= 10 && b != c)
!( a <= 10 && b != c )
12
Which of these variable names IS valid?
1stInt
a
sales&profits
int
13
What is the file extension for a Java code source file?
.exe
.class
.java
.code
14
Which of these is NOT a programming language?
Fortran
Windows
Java
C++
15
Which of these variable names is NOT valid?
doubleSales
inter
char
sales
16
What is a "getter"?
A class method that instantiates an object
A class method that returns object data
A class method that prints out object data
A class method that changes object data
17
Which of these is NOT a logical operator?
||
?:
!
&&
18
What is a "setter"?
A class method that instantiates an object
A class method that returns object data
A class method that changes object data
A class method that prints out object data
19
For a variable 'jon' of class 'Person' with a method 'getMoney' which is correct?
Person.jon.getMoney()
jon->getMoney();
jon.getMoney()
Person.getMoney()
20
What shapes were used in the IF flowchart diagrams?
Diamonds and Rectangles
Ellipses and Trapezoids
Circles and Squares
Diamonds and Circles
21
What is a test plan?
Run the program with diff. values to execute all code blocks
Run the program with diff. values to execute all false block
Assume we don't know how the code is written
Run the program with diff. values to execute all true blocks
22
Which is a relational Operator?
=
<=
==
||
23
What does API stand for?
Application Programming Interface
Application Production Information
All Product Information
Application Program Inteligence
24
What is the file extension of a compiled Java program?
.exe
.class
.java
.prog
25
How do you create a instance of a class?
Class myClass = new Class();
Class myClass = Class();
Class myClass = Class.new();
Class myClass = new Class;
26
What does String.indexOf(String str) do?
Returns the substring after 'str' is removed from String
Returns the substring before 'str' in String
Returns the substring after 'str' in String
Returns the position of 'str' within the String, or -1
27
Which is the wrapper class of 'int'?
INT
Integer
Int
integer
28
What is Object-Oriented Programming?
Code used to navigate the open seas
Combine data and methods to represent specific concepts
Code that works on 3D model objects
Using multiple arrays to store small portions of our data
29
Which of these is a static class?
String
Math
DecimalFormat
Scanner
30
Which denotes a constant?
TAX-RATE
TAXRATE
tAXrATE
TAX_RATE
31
What does an Object reference do?
Contains all of the objects data
Is used to check that the object has correct data
Points to the location in memory of the object
Is the blueprint for creating new objects
32
Class names start with a Capital?
False
True
33
Which is a Equality operator?
!=
>
=
&&
34
What is the standard input (keyboard)?
System.keyboard
System.in
System.inputStream
System.input
35
To compile a program named Hello.java, what do you type at the command line?
javac Hello.java
java Hello
java Hello.java
javac Hello
36
What is the purpose of the 'toString()' method?
Return a String representing the data of the object
Return a String representing the structure of the class
Return a String representing methods available to the class
Return a String representing the number of object references
37
Object references start with a Capital?
False
True
38
What package contains DecimalFormat?
java.text
java.io
java.lang
java.util
39
Using classes allows us to reuse code that's already written?
True
False
40
Which method will return the character at a certain position?
String.charAt(int);
String[int];
String.text[int];
String.char(int);
41
A 'String' is an object?
False
True
42
What is a class constructor?
A special method that references the object
A special method that creates the object and sets values
A special field that contains the object reference
The special class that creates all of our other classes
43
What is a 'unary' operator?
Operator that works on one operand
It does not conform to societies binary expectations
Operator that works only with other operands
Operator that works on two operands
44
What is encapsulation?
Keeping some data private, others cannot access it directly
Putting our object instances inside a dedicated code block
Allowing users to manipulate the data directly
Hidden class methods so that users cannot abuse them
45
What String method will return a sub-part of a String?
String.portion()
String.split()
String.seperate()
String.substring()
46
You have compiled Hello.java. What do you type to run the application?
javac Hello
java Hello
javac Hello.class
java Hello.class

Combined: Programming 1 Unit 2 + Programming 1 - Unit 1 + Programming 1 Unit 3 Flashcards | StudBud