Unit-1 Quiz2

What is a static variable in Java?

• A static variable is a variable that cannot be changed once initialized.

• A static variable is a variable that is only accessible within the method it is declared.

• A static variable is a method-level variable unique to each instance.

• A static variable is a class-level variable shared among all instances of the class.

How does a static variable differ from an instance variable?

• A static variable is shared across all instances of a class, while an instance variable is unique to each instance.

• A static variable can only be accessed within the class, while an instance variable can be accessed from outside the class.

• A static variable is unique to each instance of a class, while an instance variable is shared across all instances.

• A static variable is created every time an instance is created, while an instance variable is created only once.

Can a static variable be accessed without creating an object?

• Static variables cannot be accessed from outside their class.

• Yes, a static variable can be accessed without creating an object.

• Static variables can only be accessed in the same class.

• No, a static variable requires an object to be accessed.

What are the characteristics of a static method in Java?

• Characteristics of a static method in Java include: belongs to the class, can be called without an instance, can access static variables/methods, cannot access instance variables/methods directly.

• Can access both static and instance variables directly

• Can only be called from an instance of the class

• Belongs to an object rather than the class

Can a static method access instance variables directly?

• Yes, a static method can access instance variables directly.

• No, a static method cannot access instance variables directly.

• Static methods can access instance variables through an object reference.

• Static methods can modify instance variables directly.

What is the purpose of a static block in Java?

• To initialize static variables or perform actions at class loading time.

• To handle exceptions that occur during class loading.

• To define methods that can be called without creating an instance of the class.

• To create a new instance of a class when it is loaded.

What is the main difference between String and StringBuffer in Java?

• StringBuffer is faster than String for all operations.

• String can be modified after creation while StringBuffer cannot.

• String is used for character data while StringBuffer is used for numeric data.

• The main difference is that String is immutable while StringBuffer is mutable.

Is String mutable or immutable in Java?

• Changeable

• Mutable

• Immutable

• Variable

How does StringBuffer handle memory compared to String?

• StringBuffer is mutable and manages memory more efficiently than String, which is immutable.

• StringBuffer is immutable and cannot be changed after creation.

• String uses a fixed amount of memory regardless of its content.

• String is mutable and uses less memory than StringBuffer.

What method would you use to append text to a StringBuffer?

• Use the delete() method.

• Use the replace() method.

• Use the append() method.

• Use the insert() method.