AP Computer Science A Practice Test (2027)

Consider the following code: String str1 = "Hello"; String str2 = str1.concat(" World"); System.out.println(str1); What will be printed?

Consider this code: String word = "computer"; int index = word.indexOf("put"); What is the value of index?

A game development team is creating a Player class for their video game. Here is their current implementation: public class Player { private String name; private int health; private int score; public Player(String playerName) { name = playerName; health = 100; score = 0; } public void takeDamage(int damage) { health = health - damage; } public int getHealth() { return health; } } A programmer writes the following code: Player p = new Player("Alex"); p.takeDamage(25);

After this code executes, what will p.getHealth() return?

Which of the following correctly demonstrates method chaining in Java?

Consider the following code: String message = "Java Programming"; String result = message.replace("a", "@"); What is the value of result?

A class is intended to allow objects to be created in more than one way, as in `Rectangle r1 = new Rectangle(5);` and `Rectangle r2 = new Rectangle(5, 8);`. Which pair of constructor headers correctly overloads the constructor to support both statements?

A software development team is creating a Student class for a school management system. They need to store information about each student including their name, ID number, and GPA. The following code snippet shows part of their implementation: public class Student { private String name; private int studentID; private double gpa; public Student(String n, int id, double g) { name = n; studentID = id; gpa = g; } }

Based on the code above, which statement about creating a Student object is correct?

Consider the following code: String text = "Programming"; String result = text.substring(3, 7); What is the value of result?

A programmer is working with the following Rectangle class: public class Rectangle { private double length; private double width; public Rectangle(double l, double w) { length = l; width = w; } public double getArea() { return length * width; } public double getPerimeter() { return 2 * (length + width); } } The programmer creates a Rectangle object with the following code: Rectangle rect = new Rectangle(5.0, 3.0);

What will be the result of calling rect.getPerimeter()?

What will happen if you try to call a method on a reference variable that has been assigned the value null?

What does it mean for an instance variable to be declared as 'private' in Java?

Which of the following statements about the 'new' keyword in Java is most accurate?

Which of the following best explains why we use the dot operator (.) in Java?

A programmer writes the class header `public class Bicycle` and then writes `Bicycle b1 = new Bicycle("red", 21);` and `Bicycle b2 = new Bicycle("blue", 18);` inside a main method. Which of the following statements correctly describes what exists in the program?

A library system uses the following Book class: public class Book { private String title; private String author; private int pages; private boolean checkedOut; public Book(String t, String a, int p) { title = t; author = a; pages = p; checkedOut = false; } public void checkOut() { checkedOut = true; } public boolean isAvailable() { return !checkedOut; } } A librarian creates and uses a Book object as follows: Book novel = new Book("1984", "George Orwell", 328); novel.checkOut();

What will novel.isAvailable() return after this code executes?

Consider this code: String text = "Hello World"; String upper = text.toUpperCase(); String lower = upper.toLowerCase(); After this code executes, what are the values of text, upper, and lower?

Consider the following code: String str = "Hello World"; int length = str.length(); What is the value of length after this code executes?

A programmer is testing the following Circle class: public class Circle { private double radius; public Circle(double r) { radius = r; } public double getArea() { return Math.PI * radius * radius; } public double getCircumference() { return 2 * Math.PI * radius; } public void setRadius(double r) { radius = r; } } The programmer writes this test code: Circle c = new Circle(5.0); double area1 = c.getArea(); c.setRadius(10.0); double area2 = c.getArea();

What is the relationship between area1 and area2?

Which of the following best describes the relationship between a class and an object in Java?

What is the purpose of a constructor in Java?