11. Which keyword is used to declare a variable that can hold a reference to an object of any class in Java?
12. What is the default value of a boolean variable in Java if it's not explicitly initialized?
13. Which of the following is the correct way to declare a hexadecimal value in Java?
14. What is the minimum value that can be stored in a char variable in Java?
15. In Java, which data type is used to store numbers with decimal points?
16. Which of the following is not a primitive data type in Java?
17. What is the default value of a double variable in Java if it's not explicitly initialized?
18. What is the keyword used to declare a constant value in Java?
19. Which of the following is not a valid way to declare an integer variable in Java?
20. In Java, which data type is used to store numbers with decimal points and greater precision than float?
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