Core Java perguntas e respostas de entrevista
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Pergunta 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.
Pergunta 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
Pergunta 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
Pergunta 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.
Pergunta 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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Mais uteis segundo os 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()?