Core Java preguntas y respuestas de entrevista
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Pregunta 106. What do you understand by private, protected and public?
These are accessibility modifiers. Private is the most restrictive, while public is the least restrictive. There is no real difference between protected and the default type (also known as package protected) within the context of the same package, however the protected keyword allows visibility to a derived class in a different package.
Pregunta 107. What happens to a static var that is defined within a method of a class ?
Can't do it. You'll get a compilation error
Pregunta 108. What does the 'final'?? keyword mean in front of a variable? A method? A class?
FINAL for a variable: value is constant. FINAL for a method: cannot be overridden. FINAL for a class: cannot be derived
Pregunta 109. What is the final keyword denotes?
final keyword denotes that it is the final implementation for that method or variable or class. You can't override that method/variable/class any more.
Pregunta 110. What is the difference between a static and a non-static inner class?
A non-static inner class may have object instances that are associated with instances of the class's outer class. A static inner class does not have any object instances.
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Lo mas util segun los usuarios:
- How could Java classes direct program messages to the system console, but error messages, say to a file?
- What are the differences between an interface and an abstract class?
- Why would you use a synchronized block vs. synchronized method?
- How can you force garbage collection?
- What are the differences between the methods sleep() and wait()?