Java Chapter 5: Branches (Incomplete)

Front 1

Assume str1 is "Apples" and str2 is "apples".

True or False: str1.equals("Apples")

Back 1

True

Front 2

Assume str1 is "Apples" and str2 is "apples".

True or False: str1.equals(str2)

Back 2

False

Front 3

Correct format for compareTo() to find if str1 is less-than str2

Back 3

str1.compareTo(str2) < 0

Front 4

Indicate the result of comparing the first string with the second string.

Possible answers: less-than, equal, greater-than

"Apples", "Oranges"

Back 4

less-than

'A' is less-than 'O'

Front 5

Indicate the result of comparing the first string with the second string.

Possible answers: less-than, equal, greater-than

"merry", "Merry"

Back 5

greater-than

The coded value for 'm' is greater-than the coded value for 'M'

Front 6

Correct format for compareTo() to find if str1 is greater-than str2

Back 6

str1.compareTo(str2) > 0

Front 7

Correct format for compareTo() to find if str1 is equal-to str2

Back 7

str1.compareTo(str2) == 0

Front 8

Given userText is "Think".

What character is at index 1 of userText?

Back 8

h

Index numbering starts with 0. T is at index 0, h is at index 1.

Front 9

Given userText is "Think"

To what character does this evaluate: userText.charAt(3)

Back 9

n

Indexes start with 0, so 3 corresponds to the 4th character (0, 1, 2, *3*).

Front 10

Given userText is "March 17, 2034".

What does userText.length() return?

Back 10

14

Count every character including spaces.

Front 11

Given userText is "March 17, 2034".

What does userText.isEmpty() return?

Back 11

false

The string is not empty. Same as userText.length() == 0.

Front 12

Given userText is "March 17, 2034".

What does userText.indexOf(',') return?

Back 12

8

',' is the 9th character, so its index is 8.

Front 13

Given userText is "March 17, 2034".

What is the index of the last character in userText?

Back 13

13

There are 14 characters, so the index of the last character is 13.

Front 14

Given userText is "March 17, 2034".

What character does userText.charAt(userText.length() - 1) return?

Back 14

4

That's one way to get the last character.

Front 15

Given userText is "March 17, 2034".

What does userText.substring(0, 3) return?

Back 15

Mar

String starting with M and ending with r.

Remember: [substring(startIndex, endIndex] Returns substring starting at startIndex and ending at endIndex - 1. The length of the substring is given by endIndex - startIndex.

Front 16

Given userText is "March 17, 2034".

What does userText.substring(userText.length() - 4, userText.length()) return?

Back 16

2034

That form gets the last 4 characters.

Front 17

What is the correct notation for charAt()?

Back 17

someString.charAt(0)

The "0" determines the character at a particular index of a string .

Front 18

What is the correct notation for length()?

Given String userText

userText = "Happy"

Back 18

userText.length()

Returns 5

Front 19

What is the correct notation for indexOf(item)?

String userText = "Help me!"

Back 19

userText.indexOf('p')

That returns 3

Front 20

What is the correct notation for substring(startIndex, endIndex)?

String userText = "http://google.com"

Back 20

userText.substring(13, 17)

Returns ".com"

Front 21

Correct notation for concat(moreString)?

String userText = "Hi"

String newText = "Hi there"

Back 21

// userText is "Hi"

userText = userText.concat(" friend");

// Now "Hi friend"

newText = userText.concat(" there");

// newText is "Hi there"

Front 22

Correct notation for replace(findStr, replaceStr) and replace(findChar, replaceChar)?

Back 22

// userText is "Hello"

userText = userText.replace('H', 'j');

// Now "jello"

// userText is "You have many gifts"

userText = userText.replace("many", "a plethora of");

// Now "You have a plethora of gifts"

// userText is "Goodbye"

newText = userText.replace("bye"," evening");

// newText is "Good evening"

Front 23

Correct notation for str1 + str2?

Back 23

// userText is "A B"

myString = userText + " C D";

// myString is "A B C D"

myString = myString + '!';

// myString now "A B C D!"

Front 24

What is str1 += str2?

Back 24

Shorthand for str1 = str1 + str2.

// userText is "My name is "

userText += "Tom";

// Now "My name is Tom"

Front 25

To what value does each evaluate?

userStr is "Hey #1?".

True or False?

Character.isLetter('7')

Back 25

False

'7' is not an alphabetic letter (a-z or A-Z.)

Front 26

To what value does each evaluate?

userStr is "Hey #1?".

True or False?

Character.isLetter(userStr.charAt(0))

Back 26

True

'H' is alphabetic.

Front 27

To what value does each evaluate?

userStr is "Hey #1?".

True or False?

Character.isWhitespace(userStr.charAt(3))

Back 27

True

That character is a space ' ' between the y and #.

Front 28

To what value does each evaluate?

userStr is "Hey #1?".

True or False?

Character.isDigit(userStr.charAt(6))

Back 28

False

That character is '?'.

Front 29

To what value does each evaluate?

userStr is "Hey #1?".

True or False?

Character.toUpperCase(userStr.charAt(1)) returns 'E'.

Back 29

True

'e' becomes 'E'.

Front 30

To what value does each evaluate?

userStr is "Hey #1?".

True or False?

Character.toLowerCase(userStr.charAt(2)) yields an error because 'y' is already lower case .

Back 30

False

No error, just returns 'y'.

Front 31

To what value does each evaluate?

userStr is "Hey #1?".

True or False?

Character.toLowerCase(userStr.charAt(6)) yields an error because '?' is not alphabetic.

Back 31

False

No error, just returns '?'.