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♦ Java abstract classes Vs interfaces Interview Q&As

Q1. When to use an abstract class over an interface? Q2. What is a diamond problem? Q3. Does Java support multiple inheritance? In design, you want the base class to present only an interface (or a contract) for its derived classes. This means, you don’t want anyone to actually instantiate…...

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♦ Java classes and interfaces are the building blocks

Q1. Which class declaration is correct if A and B are classes and C and D are interfaces? a) class Z extends A implements C, D{} b) class Z extends A,B implements D {} c) class Z extends C implements A,B {} d) class Z extends C,D implements B {}…...

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♦ Java class loading interview Q&A to ascertain your depth of Java knowledge

Q1. What do you know about Java class loading? Explain Java class loaders? A1. Class loaders are hierarchical. Classes are introduced into the JVM as they are referenced by name in a class that is already running in the JVM. So, how is the very first class loaded? The very…...

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