Java Interview Guide : 200+ Interview Questions and Answers - Static variables and methods

The video tutorial explains static variables and methods, highlighting their class-level nature. Static variables are shared across all instances of a class, unlike instance variables which are unique to each object. The tutorial uses a Cricketer class example to demonstrate how static variables work. It also covers static methods, which can only access class-level variables, and emphasizes the importance of using class names to access static members. The video concludes with a summary and encourages viewers to experiment with examples to deepen their understanding.

What is the primary characteristic of static variables?

• They are unique to each instance of a class.

• They are shared across all instances of a class.

• They can only be accessed within the method they are declared.

• They are automatically initialized to zero.

In the Cricketer class example, what happens to the static variable 'count' when a new cricketer is created?

• It is decremented by one.

• It remains unchanged.

• It is reset to zero.

• It is incremented by one.

What is the effect of modifying a static variable in one object?

• It affects only that object.

• It affects all instances of the class.

• It causes a runtime error.

• It resets the variable to its default value.

Why can't static methods access instance variables?

• Because static methods are not part of any instance.

• Because instance variables are private by default.

• Because static methods are only accessible within the same class.

• Because instance variables are not initialized.

What happens if you try to declare a local variable as static?

• It will be ignored by the compiler.

• It will be initialized to zero.

• It will cause a compilation error.

• It will be shared across all instances.

What is a recommended practice when accessing static variables?

• Use the instance name to access them.

• Use the class name to access them.

• Access them only within static methods.

• Avoid using static variables altogether.

How can you access a static method?

• Only within the same package.

• Directly using the class name.

• Only through a subclass.

• Only through an instance of the class.