Java String

Question 1

It contains a collection of Unicode Characters surrounded by double quotes

Answer 1

String

Question 2

Used for storing text

Answer 2

String

Question 3

The length of a string can be found with the Length
property.

Answer 3

String length

Question 4

Syntax of string length

Answer 4

identifier.length()

Question 5

Returns the uppercase equivalent of the argument; no change is made if the argument is not a lowercase letter.

Answer 5

String toUpperCase

Question 6

Syntax of String toUpperCase

Answer 6

identifier.toUpperCase()

Question 7

Returns the lowercase equivalent of the argument; no change is made if the argument is not an uppercase letter.

Answer 7

String toLowerCase

Question 8

Method of combining two strings or more than string at once

Answer 8

StringConcatenation

Question 9

You can access the characters in a string by referring to its index number
inside.

Answer 9

String charAt

Question 10

Syntax of String charAt

Answer 10

identifier.charAt(index number)

Question 11

You can also find the index position of a specific character in a string, by using the indexOf() method

Answer 11

String indexOf

Question 12

It extracts the characters from a string, starting from the specified
character position/ index and returns a new string.

Answer 12

String substring()

Question 13

Syntax of String substring()

Answer 13

identifier.substring(index)

Question 14

Contains standard methods for testing the values of characters

Answer 14

Character class

Question 15

Returns true if the arguement is a digit (0-9) and false otherwise

Answer 15

Character.isDigit()

Question 16

Returns true if the arguement is a letter and false otherwise

Answer 16

Character.isLetter()

Question 17

Returns true if the arguement is a letter or digit and false otherwise

Answer 17

Character.isLetterorDigit()

Question 18

Returns true if the arguement is whitespace and false otherwise

Answer 18

Character.isWhitespace()

Question 19

Each take a String argument and return true or false if a String object does or does not end or start with the specified argument.

Answer 19

endsWith() & startsWith() method

Question 20

Allows you to replace all occurrences of some character within a String.

Answer 20

replace() method

Question 21

The method returns true if the objects have identical contents

Answer 21

equals() method

Question 22

You can compare one string to another.

Answer 22

compareTo() method

Question 23

Format a string with as many characters as are needed

Answer 23

%s

Question 24

Format a string with the specified number of characters, and right justify

Answer 24

%15s

Question 25

Format string with the specified number of characters, and left justify

Answer 25

%-15s

Question 26

Format a string with as many numebers as are needed

Answer 26

%d

Question 27

Format a string with a specified number of integers, will pad with spaces to the left if not enough integers

Answer 27

%15d

Question 28

Format a string with a specified number of integers, will pad with zeros to the left if not enough integers

Answer 28

%04d

Question 29

Format string with as many numbers as are needed. Will always give you six decimal places

Answer 29

%f

Question 30

Format string with as many numbers as are needed. Gives 2 decimal places

Answer 30

%.2f

Question 31

The whole string occupies 10 characters. If there’s not enough numbers, then spaces are used to the left of the numbers

Answer 31

%10.2f