AP Comp Sci A Review

Methods

100

Inside the parentheses of the method

Parameter

200

How to call a method outside the class (class = ClassName & method = methodName)

ClassName.methodName(arguments);

300

Class method that returns the square root of an int

Math.sqrt();

400

public class Main {
  static void myMethod() {
    System.out.println("Hello World!");
  }

  public static void main(String[] args) {
    myMethod();
  }
} 

What is the output of the shown code?

Hello World!

500

class Calculator {
        public int add(int a, int b) {
            return a + b;
        }

        public double add(double a, double b) {
            return a + b;
        }
    }

What concept is being conveyed?

Polymorphism

Variables

100

Used to store whole numbers

int variables

200

A true/false statement

boolean variables

300

Keyword for a variable that cannot be accessed outside the class

private

400

The default value for this variable is 0

Byte

500

Consider the following code segment:

int x = 2; int y = 7; 

double result = y / (double) x; System.out.println(result);

What will be printed when this code is run?

3.5

Notation

100

The correct way to write a print statement that jumps to the next line after execution

System.out.println();

200

The correct way to declare/initialize an int variable "numStudents" with a value of 15

int numStudents = 15;

300

The correct way to create a new Scanner object "input"

Scanner input = new Scanner(System.in);

400

The general notation for creating a new object (class = ClassName & object = objectName)

ClassName objectName = new ClassName(arguments);

500

The correct notation of the signature for the main method

public static void main (String[] args)

Loops

100

The main purpose of loops (think one general word)

Repetition

200

The loop used when we know the number of times we want the statement to be executed

For loop

300

Keyword to escape an infinite loop

break

400

What does the following code print?

for (int i = 2; i < 9; i++) 

{   

     System.out.print(i + ", "); 

}

2, 3, 4, 5, 6, 7, 8

500

Consider the following loop, where n is some positive integer.

for (int i = 0; i < n; i += 2) 

{

    /* perform some action */ 

}

In terms of n, which Java expression represents the maximum number of times that /* perform some action */ could be executed?

(n + 1) / 2;

Classes/Program Design

100

Using the same constructor to make different objects

Overloading

200

True/False: It is efficient to create an object of a class and use it outside the class

True

300

Hiding implementation details of data structures and exposing only essential operations

Abstraction

400

Keyword that describes an object of the class

static

500

public class Main {

   public ____ (){

      System.out.println("Constructor called");

   }

}

Complete the constructor (fill in the blank)

Main