Question 1

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

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

Question 2

yourCounty = "Clark" 
yourCounty.startsWith("Cla") 
What value will be returned by the startsWith() method? Explain how the startsWith() method deals with case sensitivity.

Accepted Answer

The answer of yourCounty = "Clark" 
yourCounty.startsWith("Cla") 
What value will...

Question 3

import javax.swing.JOptionPane; 
public class Practice 
{ 
    public static void main(String[] args) 
    { 
     String fullName; 
     char firstLetter; 
____ 
____ 
    } 
} 
Accepting a String from a user is common practice. Using the above code, write the statements to accept a String response from a user. Prompt the user with "Enter your name". Then use the charAt() method to extract the first character of the String .

Accepted Answer

The answer of import javax.swing.JOptionPane; 
public class Practice 
{ 
    public...

Question 4

What is a wrapper and why would you use it?

Accepted Answer

The answer of What is a wrapper and why would...

Question 5

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

The answer of StringBuilder greeting = new StringBuilder("Day 1"); 
Using...

Question 6

String s  and other objects that can't be changed are said to be immutable. What does this mean and how does it relate to values held in memory addresses?

Accepted Answer

The answer of String s  and other objects that can't...

Question 7

Give a code example of using the equivalence operator ("==") to compare the addresses of two strings where the comparison will result in the value true . The example should produce output indicating the strings have the same value.

Accepted Answer

The answer of Give a code example of using the...

Question 8

myCounty = "Clark Jackson Scioto" 
myCounty.charAt(6) 
Using the above code, what will be the value of the charAt() method once the code executes? Explain how the charAt() method operates.

Accepted Answer

The answer of myCounty = "Clark Jackson Scioto" 
myCounty.charAt(6) 
Using...

Quiz 7: Characters Strings and the Stringbuilder

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

yourCounty = "Clark" yourCounty.startsWith("Cla") What value will be returned by the startsWith() method? Explain how the startsWith() method deals with case sensitivity.

What is a wrapper and why would you use it?

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.

String s and other objects that can't be changed are said to be immutable. What does this mean and how does it relate to values held in memory addresses?

Give a code example of using the equivalence operator ("==") to compare the addresses of two strings where the comparison will result in the value true . The example should produce output indicating the strings have the same value.

myCounty = "Clark Jackson Scioto" myCounty.charAt(6) Using the above code, what will be the value of the charAt() method once the code executes? Explain how the charAt() method operates.