Java 1

1. Which of the following is an IDE mentioned in the lecture?

• 1: Eclipse

• 2: Android Studio

• 3: IntelliJ IDEA

• 4: All of the above

2.What does println do in Java?

• 1: Prints a line of text to the console.

• 2: Prompts the user for input.

• 3: Defines a variable.

• 4: Closes the console.

3. How do you declare a variable in Java?

• 1: You don't need to declare a variable before using it.

• 2: By specifying the data type and name followed by an equal sign.

• By using the keyword 'var' followed by the name (not yet implemented in Java).

• 4: None of the above

4. Which of the following is a valid data type in Java?

• 1: int

• 2: float

• 3: string (corrected to lowercase)

• 4: All of the above

5. What is the keyword used to create a class in Java?

• 1: class

• 2: struct

• 3: object

• 4: None of the above

6. What is the syntax to create a public static void main method in Java?

• 1: public static void main(String args[]) { }

• 2: void main() { }

• 3: int main() { }

• 4: None of the above

7. An error occurs when the instructor attempts to print the value of a variable before it is declared. What is the likely error message?

• 1: The variable does not exist.

• 2: The variable is not initialized.

• 3: Syntax error: missing semicolon.

• 4: Compile time error: cannot find variable.

8. What is the purpose of an array in Java?

• 1: To store a collection of items of the same data type.

• 2: To perform mathematical calculations.

• 3: To define a function.

• 4: None of the above

9. How do you access the length of an array in Java?

• 1: By using the arrayName.length method.

• 2: By using the sizeof() function (not applicable in Java).

• 3: Arrays don't have a length property.

• 4: None of the above

10. What is the difference between a for loop and a while loop in Java?

• 1: For loops are used for a predetermined number of iterations, while loops can continue indefinitely.

• 2: While loops are used for a predetermined number of iterations, for loops can continue indefinitely.

• 3: There is no difference.

• 4: None of the above