Intro to CS: Java -Data Type, graphics, condition

Question 1

What data type are int, char, and boolean?

Accepted Answer

primitive

Question 2

Which statement would be needed in order to use the Scanner class?

Accepted Answer

Scanner in = new Scanner(System.in);

Question 3

A graphical application shows information inside a _______ object.

Accepted Answer

JFrame

Question 4

What method is used to extract part of a string?

Accepted Answer

subString

Question 5

What type of variable is constant, once it is set, it can't be changed?

Accepted Answer

final

Question 6

Which statement would return true if a number x was between an upper and lower number?

Accepted Answer

(x > lower) || (x < upper), (x > lower) && (x < upper)

Question 7

What are methods that do not operate on an object?

Accepted Answer

static

Question 8

What class can be used to read input from a console window?

Accepted Answer

Scanner

Question 9

Which operator calculates the remainder for division of two integers?

Accepted Answer

%

Question 10

The operators !, &&, and || are ______ operators.

Accepted Answer

boolean

Question 11

Given, int m = 2, int n = 7, double x = 1.5, double y = -3.1. Find: !(m > n) && (x > y)

Accepted Answer

true

Question 12

What operator tests the relationship between two values?

Accepted Answer

relational

Question 13

What would word1.compareTo(word2) < 0; return if word1 = "Bob" and word2 = "Ted"?

Accepted Answer

true

Question 14

Given this series, how many code segments would run? if (A), else if (B), else if (C), else (D)

Accepted Answer

just one, A, B, C, or D

Question 15

Lexicographical ordering is similar to alphabetical order, but things are ordered as follows...

Accepted Answer

numbers, capital letters, lowercase letters

Question 16

What is a problem with the following general code layout? if(x == 3)...if(x < 7)...if(x > 20)

Accepted Answer

Will execute first two segments if x is 3. What we want?, What happens if x is 10? Should have else at the end.

Question 17

An object reference can have a value of ______ which means it is assigned no object.

Accepted Answer

null

Question 18

Given, int x = 2, int y = 7, and double z = 1.5. Find the value of y % x

Accepted Answer

1

Question 19

What can be done to convert a value to a different type?

Accepted Answer

casting

Question 20

Which is the assignment operator in Java?

Accepted Answer

=

Question 21

A predicate method is one that...

Accepted Answer

returns a boolean value

Question 22

Given, int x = 2, int y = 7, and double z = 1.5. Find the value of z + y / x.

Accepted Answer

4.5

Questions 22