Question 1

The methods islowerCase() and toLowerCase() perform the same tasks.

Accepted Answer

A) True 
 B)False  False

Question 2

StringBuilder greeting = new StringBuilder("Day 1"); 
Using the above StringBuilder , create a setCharAt() method that will change the "1" to a "2" in the String "Day 1" . Explain how the setCharAt() method operates.

Accepted Answer

greeting.setCharAt(4, '2'); To alter just one character in a StringBuilder , you can use the setCharAt() method, which allows you to change a character at a specified position within a StringBuilder object. This method requires two arguments: an integer position and a character. In the phrase "Day 1", the greeting.setCharAt(4, '2'); changes the value 1 to 2.

Question 3

Match between columns
                        Premises: Change the length of a string in a StringBuilder object

Accepted Answer

The Answer of substring(). and append(). and anonymous object and is...

Question 4

Match between columns
                        Premises: Class or object that wraps around a simpler element

Accepted Answer

The Answer of insert() and immutable and concatenation and buffer is...

Question 5

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

Accepted Answer

The replace() method allows you to repla

Question 6

The method header of the equals() method within the String class is ____.

Accepted Answer

A)  public boolean equals(Strings) 
B)  private boolean equals(String s) 
C)  public boolean equals(String s) 
D)  public boolean equals(Character s) 
A)  public boolean equals(Strings) 
B)  private boolean equals(String s) 
C)  public boolean equals(String s) 
D)  public boolean equals(Character s)

Question 7

When you declare a variable of a basic, primitive type, such as int x = 10; , the memory address where x is located holds the ____.

Accepted Answer

A)  location in memory of 10 
B)  memory address of 10 
C)  reference to 10 
D)  value of 10 
A)  location in memory of 10 
B)  memory address of 10 
C)  reference to 10 
D)  value of 10

Question 8

The ____ class contains standard methods for testing the values of characters.

Accepted Answer

A)  char 
B)  character 
C)  StringChar 
D)  Character 
A)  char 
B)  character 
C)  StringChar 
D)  Character

Question 9

The ____ method takes a String argument and returns its double value.

Accepted Answer

A)  parseString() 
B)  parseInt() 
C)  parseDouble() 
D)  returnDouble() 
A)  parseString() 
B)  parseInt() 
C)  parseDouble() 
D)  returnDouble()

Question 10

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

Accepted Answer

As an object, a String variable name is

Question 11

Consider the statement: int anInt = Integer.parseInt("649");
You can tell that  parseInt() is a(n) ____ method because you use it with the class name and not with an  object.

Accepted Answer

A)  programmer-defined 
B)  instance 
C)  static 
D)  immutable 
A)  programmer-defined 
B)  instance 
C)  static 
D)  immutable

Question 12

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

Accepted Answer

You can extract part of a String with th

Question 13

To convert a String to an integer, you use the ____ class, which is part of java.lang and is automatically imported into programs you write.

Accepted Answer

A)  StringBuilder 
B)  String 
C)  Integer 
D)  Convert 
A)  StringBuilder 
B)  String 
C)  Integer 
D)  Convert

Question 14

A(n) ____ comparison is based on the integer Unicode values of the characters.

Accepted Answer

A)  integer 
B)  symbol 
C)  lexicographical 
D)  character 
A)  integer 
B)  symbol 
C)  lexicographical 
D)  character

Question 15

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 String class equalsIgnoreCase() meth

Question 16

When you must determine whether a String is empty, it is more efficient to compare its length to 0 than it is to use the equals () method.

Accepted Answer

A) True 
 B)False

Question 17

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

​When you increase a StringBuilder objec

Question 18

A String variable name is not a simple data type.

Accepted Answer

A) True 
 B)False

Question 19

StringBuilder greeting = new StringBuilder("Welcome"); 
Use the append() method to add the characters "home" to the end of the StringBuilder object created above.

Accepted Answer

greeting.append(" home"); (Be

Question 20

String oneStr = "Welcome Jim" String twoStr = "Welcome Joe"
Given the lines of code above, which of the following regionMatches() expressions will result in a value of true ?

Accepted Answer

A)  oneStr.regionMatches(8, twoStr, 8, 3) 
B)  oneStr.regionMatches(0, twoStr, 0, 7) 
C)  oneStr.regionMatches(8, twoStr, 0, 3) 
D)  oneStr.regionMatches(0, twoStr, 8, 3) 
A)  oneStr.regionMatches(8, twoStr, 8, 3) 
B)  oneStr.regionMatches(0, twoStr, 0, 7) 
C)  oneStr.regionMatches(8, twoStr, 0, 3) 
D)  oneStr.regionMatches(0, twoStr, 8, 3)

The methods islowerCase() and toLowerCase() perform the same tasks.

StringBuilder greeting = new StringBuilder("Day 1"); Using the above StringBuilder , create a setCharAt() method that will change the "1" to a "2" in the String "Day 1" . Explain how the setCharAt() method operates.

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

The method header of the equals() method within the String class is ____.

When you declare a variable of a basic, primitive type, such as int x = 10; , the memory address where x is located holds the ____.

The ____ class contains standard methods for testing the values of characters.

The ____ method takes a String argument and returns its double value.

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

Consider the statement: int anInt = Integer.parseInt("649"); You can tell that parseInt() is a(n) ____ method because you use it with the class name and not with an object.

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

To convert a String to an integer, you use the ____ class, which is part of java.lang and is automatically imported into programs you write.

A(n) ____ comparison is based on the integer Unicode values of the characters.

When you must determine whether a String is empty, it is more efficient to compare its length to 0 than it is to use the equals () method.

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?

A String variable name is not a simple data type.

StringBuilder greeting = new StringBuilder("Welcome"); Use the append() method to add the characters "home" to the end of the StringBuilder object created above.

String oneStr = "Welcome Jim" String twoStr = "Welcome Joe" Given the lines of code above, which of the following regionMatches() expressions will result in a value of true ?

Creating Your First Java Classes

Using Data

Using Methods, Classes and Objects

More Object Concepts

Making Decisions

Looping

Arrays

Advanced Array Concepts

Introduction to Inheritance

Advanced Inheritance Concepts

Exception Handling

File Input and Output

Introduction to Swing Components

Using Javafx and Scene Builder

Filters

Exam 7: Characters, Strings and the Stringbuilder

The methods islowerCase() and toLowerCase() perform the same tasks.

StringBuilder greeting = new StringBuilder("Day 1"); Using the above StringBuilder , create a setCharAt() method that will change the "1" to a "2" in the String "Day 1" . Explain how the setCharAt() method operates.

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

The method header of the equals() method within the String class is ____.

When you declare a variable of a basic, primitive type, such as int x = 10; , the memory address where x is located holds the ____.

The ____ class contains standard methods for testing the values of characters.

The ____ method takes a String argument and returns its double value.

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

Consider the statement: int anInt = Integer.parseInt("649"); You can tell that parseInt() is a(n) ____ method because you use it with the class name and not with an object.

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

To convert a String to an integer, you use the ____ class, which is part of java.lang and is automatically imported into programs you write.

A(n) ____ comparison is based on the integer Unicode values of the characters.

When you must determine whether a String is empty, it is more efficient to compare its length to 0 than it is to use the equals () method.

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?

A String variable name is not a simple data type.

StringBuilder greeting = new StringBuilder("Welcome"); Use the append() method to add the characters "home" to the end of the StringBuilder object created above.

String oneStr = "Welcome Jim" String twoStr = "Welcome Joe" Given the lines of code above, which of the following regionMatches() expressions will result in a value of true ?

Creating Your First Java Classes

Using Data

Using Methods, Classes and Objects

More Object Concepts

Making Decisions

Looping

Arrays

Advanced Array Concepts

Introduction to Inheritance

Advanced Inheritance Concepts

Exception Handling

File Input and Output

Introduction to Swing Components

Using Javafx and Scene Builder

Filters

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?