AP CS Final Exam

What java library must be imported to get user input for the Scanner class?

• DecimalFormat( ) 
• javax.swing.JOptionPane;
• java.util.Scanner;
• java.util.Random

What is a constructor?

• another name for an instance variable
• the method that creates an object, or instance, of the class
• the return type of a method
• the instantiation of an object

What is 1001 0011 in decimal?

• 148
• 156
• 147
• none of these

What does it mean when a method is static?

• it modifies or mutates an object
• it is private
• it applies to the entire class, not just one object or instance
• it is overloaded

What is method overloading?

• having two or more methods with the same name but different parameters
• using a static method instead of an instance method
• passing in the wrong type of parameter for a method
• none of these

What is the result of the following expression when x is 3583?
(x/10)%10

• 3
• 8
• 83
• 300

What gets printed?

• 4 16
• 4 10 16
• 0 6 12 18
• 1 4 7 10 13 16 19

• list.name(1)
• list[1].name()
• name.list[1]
• list.name()[1]

Which of the following correctly initializes an array to contain four elements each with value 0?
I. int[ ] arr = { 0, 0, 0, 0};
II. int[ ] arr = new int[4];
III. int[ ] arr = new int[4];
     for(int i = 0; i < arr.length; i++)
       arr[i] = 0;

• I only
• I and II only
• I, II, and III
• I and III

• I only
• I and II only
• I and III only
• II and III only