Exam 7: Characters Strings and the Stringbuilder

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?

The creators of Java chose ____ characters as the "extra" length for a StringBuilder object.

In Java, a(n) ____________________ is a class or object that is wrapped around a simpler element.

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

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.

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

A literal string is a(n) ____ object.

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

The ____ method returns the length of a String .

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.

When using the prewritten equals() method, a true or false comparison between two String s is returned, but you do not know how the code looks behind the scenes.

The ____ method allows you to replace all occurrences of some character within a String .

The Character class ____ from java.lang.Object .

Besides Double and Integer , other wrapper classes such as Float and Long also provide ____ methods that convert String s to the wrapper types.

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.

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?

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 .

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

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

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?