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Public class

from class:

AP Computer Science A

Definition

A public class is one that can be accessed and used by any other class or program. It serves as the blueprint for creating objects and contains variables and methods.

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Practice Questions (13)

What is the output of the following code? public class Calculator { public int add(int x, int y) { return x + y; } public int multiply(int x, int y) { return x * y; } public static void main(String[] args) { Calculator calc = new Calculator(); System.out.println(calc.add(5, 6) + calc.multiply(2, 3)); } }
What will the following code print out? public class NamePrinter { public void printName(String name) { System.out.println("Your name is: " + name); } public void printAge(int age) { System.out.println("Your age is: " + age); } public static void main(String[] args) { NamePrinter np = new NamePrinter(); np.printName("John"); np.printAge(32); } }
What is the result of the following code? public class Shapes { public double calculateCircleArea(double radius) { return Math.PI * Math.pow(radius, 2); } public double calculateRectangleArea(double length, double width) { return length * width; } public static void main(String[] args) { Shapes shapes = new Shapes(); System.out.println(shapes.calculateCircleArea(5) + shapes.calculateRectangleArea(10, 2)); } }
What will the following code output? public class Book { public String title; public String author; public int pages; public Book(String bookTitle, String bookAuthor, int bookPages) { title = bookTitle; author = bookAuthor; pages = bookPages; } public void printBookInfo() { System.out.println("Title: " + title); System.out.println("Author: " + author); System.out.println("Pages: " + pages); } public static void main(String[] args) { Book book = new Book("The Great Gatsby", "F. Scott Fitzgerald", 180); book.printBookInfo(); } }
What is the output of the following code? public class Employee { public String name; public int salary; public Employee(String empName, int empSalary) { name = empName; salary = empSalary; } public void printEmployeeInfo() { System.out.println("Name: " + name); System.out.println("Salary: $" + salary); } public void giveRaise(int raiseAmount) { salary += raiseAmount; } public static void main(String[] args) { Employee emp = new Employee("John", 50000); emp.printEmployeeInfo(); emp.giveRaise(2000); emp.printEmployeeInfo(); } }
Consider the following class definition. public class Animal { private String species; private int age; private double weight; public Animal(String animalSpecies, int animalAge, double animalWeight) { species = animalSpecies; age = animalAge; weight = animalWeight; } public void eat() { weight += 5; } public double getWeight() { return weight; } } Assume that the following code segment appears in a class other than Animal. java Copy code Animal dog = new Animal("Dog", 3, 15); dog.eat(); System.out.println(dog.getWeight()); What is printed as a result of executing the code segment?
Consider the following class definition: public class Student { private String name; private int age; private String major; public Student(String studentName, int studentAge, String studentMajor) { name = studentName; age = studentAge; major = studentMajor; } public String getName() { return name; } public int getAge() { return age; } public String getMajor() { return major; } } Assume that the following code segment appears in a class other than Student: Student student = new Student("Alice", 19, "Computer Science"); String name = student.getName(); int age = student.getAge(); String major = student.getMajor(); System.out.println(name + " is " + age + " years old and majoring in " + major + "."); What is printed as a result of executing the code segment?
Consider the following code: ``` public class A { public static void doSomething() { System.out.println("Method in A"); } } public class B extends A { public static void doSomething() { System.out.println("Method in B"); } } ``` What will be the output when the following code is executed? ``` A obj = new B(); obj.doSomething(); ```
What will be the output when the following code is executed? ``` public class A { public void print() { System.out.println("A"); } } public class B extends A { public void print() { System.out.println("B"); } } public class C extends B { public void print() { System.out.println("C"); } } public class Main { public static void main(String[] args) { A obj = new C(); obj.print(); } } ```
Consider the following superclass and subclass declarations: ```java public class Shape { private String color; public Shape(String color) { this.color = color; } public String getColor() { return color; } } public class Circle extends Shape { private double radius; public Circle(String color, double radius) { // Circle constructor implementation goes here } } ```
Why does the following code not compile? public class Student { private int gpa; public getGPA() { return gpa; } // Constructor not shown }
What does the class header “public class B extends C” mean?
If classes E and F are created using the headers “public class E extends C” and “public class F extends C” respectively, what is true about them?

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Public class

from class:

AP Computer Science A

Definition

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Practice Questions (13)

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Public class

from class:

AP Computer Science A

Definition

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"Public class" also found in:

Practice Questions (13)

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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.

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