JAVA Week 1

Question 1

How to write single and double line comments

Answer 1

// and /* ….. */

Question 2

What is the command for reading input

Answer 2

import java.util.Scanner;

Question 3

How is the input tool created

Answer 3

Scanner scanner = new Scanner(System.in)

Question 4

When is the double, int, boolean variables used.

Answer 4

When double is a floating-point number, int is a whole number and boolean is a true or false value

Question 5

Instead of spaces, what is used

Answer 5

camelCase

Question 6

What is Integer.valueOf

Answer 6

Command that converts a string to an integer

Question 7

Does a conditional statement mark the start of a new code block?

Answer 7

Yes

Question 8

Why can you not compare strings with ==

Answer 8

Strings can hold a limitless amount of characters, whereas integers, floating-point numbers, and boolean values always contain a single number or value only.

Question 9

What is .equals command

Answer 9

The equals command is written after a string by attaching it to the string to be compared with a dot.

Question 10

Write a program that prompts the user for a password. If the password is “Caput Draconis” the program prints “Welcome!”. Otherwise, the program prints “Off with you!”

Answer 10

import java.util.Scanner;

public class MOOC1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Password");
        String input = String.valueOf(scanner.nextLine());

    if (input.equals("Caput Draconis")) {
        System.out.println("Welcome");
    }
    else {
        System.out.println("Off with you!");
    }
}

}