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System.out.println()

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AP Computer Science A

Definition

System.out.println() is a method in Java that allows you to display output on the console. It takes an argument (a value or a variable) and prints it as text.

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Practice Questions (20+)

What would be the result of executing the following code? System.out.println(alice.age);
What would be the result of executing the following code? System.out.println(Student.gpa);
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 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 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 method: public static int calculateSum(int n) { if (n == 1) { return 1; } else { return n + calculateSum(n - 1); } } Assume that the following code segment appears in a class: int sum = calculateSum(5); System.out.println("Sum of numbers from 1 to 5: " + sum); What is printed as a result of executing the code segment?
Consider the following method: public static boolean isPalindrome(String word) { int length = word.length(); for (int i = 0; i < length / 2; i++) { if (word.charAt(i) != word.charAt(length - 1 - i)) { return false; } } return true; } Assume that the following code segment appears in a class: boolean result = isPalindrome("racecar"); System.out.println("Is 'racecar' a palindrome? " + result); What is printed as a result of executing the code segment?
Consider the following method: public static boolean isEven(int number) { return number % 2 == 0; } Assume that the following code segment appears in a class: boolean result = isEven(7); System.out.println("Is 7 an even number? " + result); What is printed as a result of executing the code segment?
Consider the following method: public static String capitalize(String word) { return word.substring(0, 1).toUpperCase() + word.substring(1); } Assume that the following code segment appears in a class: String result = capitalize("hello"); System.out.println("Capitalized word: " + result); What is printed as a result of executing the code segment?
What is the result of the following code? Integer x = new Integer(10); int y = x; System.out.println(y);
What is the result of the following code? Integer x = new Integer(22); int y = x.intValue(); System.out.println(y);
What is the result of the following code? Integer x = new Integer(42); int y = (int) x; System.out.println(y);
What is the result of the following code? Double d = 3.14; System.out.println(d);
What is the result of the following code? int x = 5; Integer y = x; System.out.println(y);
What is the result of the following code? String str = "123"; Integer x = Integer.parseInt(str); System.out.println(x + 1);
Suppose there is a Car object whose constructor takes the brand (String) and year (int) parameters. If we create two new objects "Car c1 = new Car("Toyota", 2005);" and "Car c2 = new Car("Toyota", 2005);" what will be the output of "System.out.println(c1.equals(c2));"?
Given the following code: ``` class A { public void show() { System.out.println("A"); } } class B extends A { public void show() { System.out.println("B"); } } class C extends B { public void show() { System.out.println("C"); } } ``` What will be the output when the following code is executed? ``` A obj = new C(); obj.show(); ```
Consider the following class hierarchy: ``` class Animal { void makeSound() { System.out.println("Some sound"); } } class Dog extends Animal { void makeSound() { System.out.println("Bark"); } } class Cat extends Animal { void makeSound() { System.out.println("Meow"); } } ``` If we create an object like this: `Animal animal = new Dog();`, what will be printed when we call `animal.makeSound()`?
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(); ```

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System.out.println()

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AP Computer Science A

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System.out.println()

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AP Computer Science A

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Practice Questions (20+)

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