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What are access modifiers in Java?
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What are access modifiers? Access modifiers are a tool with which you can customize access to classes, methods, and variables. There are the following
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What is Instance Variable?
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What is Instance Variable? Instance Variable is a variable that is defined within a class, and it exists as long as the object exists. An example is the
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What is Local Variable?
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What is Local Variable? Another of the most popular Java developer interview questions. A local variable is a variable that is defined within a method
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What is polymorphism in Java?
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What is polymorphism in Java? Polymorphism is the ability of a program to identically use objects with the same interface without knowing the specific
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What is encapsulation in Java?
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What is encapsulation in Java? This question comes up a lot in Java developer interviews. Encapsulation is hiding the implementation with access modifiers
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What is inheritance in Java?
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What is inheritance in Java? Answer Inheritance means that one class can inherit (“extends”) another class. Thus, you can reuse the code from the class
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What are the features of Java?
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What are the features of Java? Answer: OOP concepts: object-oriented; inheritance; encapsulation; polymorphism; abstract. Cross-platform: A Java program
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What is NullReferenceException and how can I fix the code?
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When I execute some code, a NullReferenceException is thrown with the following message: Object reference not set to an instance of an object.
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