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Java Programming Questions

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13. What are access modifiers?
 
    Access modifiers decide whether a method or a data variable can be accessed by another method in another class or subclass.
    Java provides four types of access modifiers.
  • Public: can be accessed by any other class anywhere.
  • Protected: can be accessed by class inside the package or by subclass ( that means classes who inherit from this class).
  • Private: can be accessed only within the class. Even methods in subclasses in the same package do not have access.
  • Default: accessible to classes in the same package but not by classes in other packages, even if these are sub classes.
Abstract class myAbstractGraphics
{
Abstract void draw ();
}
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14. What modifiers may be used with an interface declaration?
  An interface may be declared as public or abstract.
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15. Why is multiple inheritances not possible in Java?
  It depends on how you understand "inheritance". Java can only "extends" one super class, but can "implements" many interfaces; that doesn't mean the multiple inheritance is not possible. You may use interfaces to make inheritance work for you. Or you may need to work around.
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16. What is the difference amongst JVM Spec, JVM Implementation, and JVM Runtime?
 
  • The JVM spec is the blueprint for the JVM generated and owned by Sun.
  • The JVM implementation is the actual implementation of the spec by a vendor and the JVM runtime is the actual running instance of a JVM implementation.
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