Computer Science -- Data Basics

Question 1

True or False: the following statement is valid --> int a, int b, int c;

Accepted Answer

False

Question 2

Import statement for Scanner

Accepted Answer

import java.util.Scanner;

Question 3

Which is the concatenation operator?

Accepted Answer

+

Question 4

Returns the index where a particular character is located in the String

Accepted Answer

indexOf

Question 5

Returns -1 if it can't find the String or char you are looking for

Accepted Answer

indexOf

Question 6

In Java, what is 2 * 5 - 4 + 3 ?

Accepted Answer

9

Question 7

"computer".substring(5);

Accepted Answer

ter

Question 8

Correct pattern for currency in DecimalFormat

Accepted Answer

"$#,##0.00"

Question 9

Returns the character located at a particular index

Accepted Answer

charAt

Question 10

Which is bigger -- char, boolean, int or double?

Accepted Answer

double

Question 11

Which keyword does a constant declaration begin with?

Accepted Answer

final

Question 12

In Java, 5 + 2 % 3 evaluates to ____?

Accepted Answer

7

Question 13

Import statement for DecimalFormat

Accepted Answer

import java.text.DecimalFormat;

Question 14

(3.0 / 2) evaluates in Java to ....?

Accepted Answer

1.5

Question 15

( (double) 3 / 2) evaluates in Java to ....?

Accepted Answer

1.5

Question 16

"computer".indexOf(C) returns _____?

Accepted Answer

nothing (syntax error)

Question 17

Which expression does not evaluate to 0.6?

Accepted Answer

(double) (6/10);

Question 18

"computer".substring(3,4);

Accepted Answer

p

Question 19

True or False: the following statement is valid --> int a, b, c;

Accepted Answer

True

Question 20

Which will correctly store the character Z in the variable named letter?

Accepted Answer

char letter = 'Z';

Question 21

Operator used for modulus division?

Accepted Answer

%

Question 22

If x is 25, what is x % 6?

Accepted Answer

1

Question 23

"computer".indexOf('C') returns _____?

Accepted Answer

-1

Question 24

Which is bigger -- char or boolean?

Accepted Answer

char

Question 25

Which is bigger -- char, boolean or int?

Accepted Answer

int

Question 26

(double) (3 / 2) evaluates in Java to ....?

Accepted Answer

1.0

Question 27

Which of the following DecimalFormat patterns will always show 1 decimal place?

Accepted Answer

("0.0")

Question 28

"Hello".charAt(1); returns _____?

Accepted Answer

e

Question 29

Returns the count of characters

Accepted Answer

length

Question 30

Which Java package contains the DecimalFormat and NumberFormat classes?

Accepted Answer

text

Computer Science -- Data Basics

Questions 30

Computer Science -- Data Basics

Questions 30