Question 1

String aName = "Michael" 
Using the above statement, write the length() method that will return the length of the aName String . What value will the length() method return when executed?

Accepted Answer

The answer of String aName = "Michael" 
Using the above...

Question 2

Match between columns
                        Premises: Change the length of a string in a StringBuilder object
Takes two integer arguments: a start position and an end position
Add characters to the end of a StringBuilder object
Takes a String argument and returns its double value
A memory block
Returns the lowercase equivalent of the argument
A named object of the String class
Determines whether a specific character occurs within a String
Add characters at a specific location within a StringBuilder object

Accepted Answer

The Answer of parseDouble() and buffer and String variable and is...

Question 3

yourCounty = "perry"; 
yourCounty.equals("Perry"); 
yourCounty.equalsIgnoreCase("Perry"); 
Using the above statements, what value will be returned by the equals() method? What will be the value of the equalsIgnoreCase() method? Explain how the equalsIgnoreCase() method can be useful when users type responses to prompts in programs.

Accepted Answer

The answer of yourCounty = "perry"; 
yourCounty.equals("Perry"); 
yourCounty.equalsIgnoreCase("Perry"); 
Using the...

Question 4

Describe how a programmer would use the two types of Character class methods (those that begin with "is" and those that begin with "to") for testing the values of characters.

Accepted Answer

The answer of Describe how a programmer would use the...

Question 5

In the above code, two strings are evaluated using the equivalency operator. Why can this be a problem, and what other methods are offered by Java for working with characters and strings?

Accepted Answer

The answer of  In the above code, two strings...

Question 6

What is the purpose of the substring() method and how do you use it?

Accepted Answer

The answer of What is the purpose of the substring()...

Question 7

How is the String class equalsIgnoreCase() method like the equals() method and how would you use it? Give an example.

Accepted Answer

The answer of How is the String class equalsIgnoreCase() method...

Question 8

String greeting = "Welcome back"; 
Using the above statement, write the length() method that will return the length of the greeting String . Store the length in an integer named greetingLength .

Accepted Answer

The answer of String greeting = "Welcome back"; 
Using the...

Question 9

StringBuilder greeting = new StringBuilder("Welcome home "); 
phrase.insert(13, "Joe"); 
Using the above code and insert() method, describe how the phrase will appear after the code executes. How does the insert() method work?

Accepted Answer

The answer of StringBuilder greeting = new StringBuilder("Welcome home ");...

Question 10

String greeting = "Welcome Home"; 
Using the above String , create the String method to convert the greeting String to all uppercase. Likewise, create the String method to convert the greeting String to all lowercase.

Accepted Answer

The answer of String greeting = "Welcome Home"; 
Using the...

Question 11

Describe how a string is a reference and how a string comparison is done.

Accepted Answer

The answer of Describe how a string is a reference...

Question 12

StringBuilder greeting = new StringBuilder("Hello, John"); 
char initial = greeting.charAt(7); 
Using the above code and the charAt() method, what value will be assigned to the variable initial ?

Accepted Answer

The answer of StringBuilder greeting = new StringBuilder("Hello, John"); 
char...

Question 13

What happens when you increase a StringBuilder object's length to be longer than the string it holds? What happens if you set the length of a string to be shorter than the string it contains?

Accepted Answer

The answer of What happens when you increase a StringBuilder...

Question 14

What is the purpose of the replace() method? Provide an example.

Accepted Answer

The answer of What is the purpose of the replace()...

Question 15

How can you change the length of a String in a StringBuilder object?

Accepted Answer

The answer of How can you change the length of...

Question 16

How can you use String methods to change the case of a string? Provide an example.

Accepted Answer

The answer of How can you use String methods to...

Question 17

String example1 = ""; 
String example2 = null; 
String example3; 
There is an important difference between empty String s and null String s. Explain the differences and why it is important when making String comparisons.

Accepted Answer

The answer of String example1 = ""; 
String example2 =...

Question 18

String firstString = "Oak Maple Pine" 
String secondString = "spruce Maple elm" 
firstCompare.regionMatches(4, secondString, 7, 5) 
Using the above code, what will be the Boolean value after execution of the regionMatches statement? Explain how the String s are compared using the regionMatches() method.

Accepted Answer

The answer of String firstString = "Oak Maple Pine" 
String...

Question 19

Explain what is needed to declare a String variable and provide an example.

Accepted Answer

The answer of Explain what is needed to declare a...

Question 20

Why would you use the append() method? Provide an example.

Accepted Answer

The answer of Why would you use the append() method?...

Quiz 7: Characters Strings and the Stringbuilder

String aName = "Michael" Using the above statement, write the length() method that will return the length of the aName String . What value will the length() method return when executed?

Match each term with the correct statement below.

Describe how a programmer would use the two types of Character class methods (those that begin with "is" and those that begin with "to") for testing the values of characters.

In the above code, two strings are evaluated using the equivalency operator. Why can this be a problem, and what other methods are offered by Java for working with characters and strings?

What is the purpose of the substring() method and how do you use it?

How is the String class equalsIgnoreCase() method like the equals() method and how would you use it? Give an example.

String greeting = "Welcome back"; Using the above statement, write the length() method that will return the length of the greeting String . Store the length in an integer named greetingLength .

StringBuilder greeting = new StringBuilder("Welcome home "); phrase.insert(13, "Joe"); Using the above code and insert() method, describe how the phrase will appear after the code executes. How does the insert() method work?

String greeting = "Welcome Home"; Using the above String , create the String method to convert the greeting String to all uppercase. Likewise, create the String method to convert the greeting String to all lowercase.