Java Basic Quiz-1

Java Basics Quiz 1

Time left: 10:00

1. What is the correct syntax for the main method in Java?

• public static void main(String[] args)
• public static void Main(String[] args)
• public void main(String[] args)
• public static void main(String args)

2. What is the size of int in Java?

• 16-bit
• 32-bit
• 64-bit
• 8-bit

3. Which of the following is not a Java keyword?

• static
• Boolean
• void
• private

4. What is the default value of a boolean variable in Java?

• true
• false
• 0
• 1

5. Which method must be implemented by all threads?

• start()
• stop()
• run()
• main()

6. Which of the following is not a primitive data type in Java?

• int
• float
• String
• char

7. What is the result of 10 + 20 + "30" in Java?

• 1030
• 3030
• 1230
• 102030

8. What is the output of the following code?

                int x = 5;
                int y = 10;
                x = y;
                y = x;
                System.out.println(x + ", " + y);
            

• 5, 10
• 10, 5
• 10, 10
• 5, 5

9. What is the use of the "final" keyword in Java?

• To mark a variable as read-only
• To prevent method overriding
• To prevent inheritance
• All of the above

10. Which of the following is true about interfaces in Java?

• Interfaces can have concrete methods
• Interfaces can have constructors
• Interfaces can be instantiated
• Interfaces can have default methods