Java

Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible.

Authors

• Apurva Kumar

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Features

• Platform Independence

• Object-Oriented

• Multi-threading Support

• Security

• High Performance:

• Integrated Development Environment (IDE) Support

• Dynamic Loading and Extensibility

  Important Topics

• Object Oriented Paradigms GFG

• Constructors in Java GFG

• Constructor chaining in Java GFG

• Inheritance in Java GFG

• Overriding in Java GFG

• Abstraction in Java GFG

• Access modifiers in Java GFG

• Wrapper Classes in Java GFG

• Need of wrapper classes in Java GFG

• this keyowrd in Java Javatpoint

• Important keyowrds in Java inheritance - extends,implements,super,instanceof Tutorialspoint

• Instance initializer block Javatpoint

• Dynamic Method Dispatch or Runtime Polymorphism in Java GFG

• Cohesion in Java GFG

• Coupling in Java GFG

Interview Questions

• Can we declare main() method as private or protected or with no access modifier in java? Tutorialspoint
• Difference between Method Overloading and Method Overriding in Java? GFG
• Can we declare interface members as private or protected in java8? Tutorialspoint
• Can we override a private or static method in Java? Tutorialspoint
• What is diamond problem in Java? Javatpoint
• Can we pass this keyword as argument in a method call? Javatpoint
• Java constructor returns a value, but what? Javatpoint
• What is covariant return type? Javatpoint
• Private classes and singleton classes in Java GFG
• How to prevent Singleton Pattern from Reflection, Serialization and Cloning? GFG
• Double-Check Locking For Singleton Class GFG

Practice Problems

• Inheritance I HackerRank
• Inheritance II HackerRank
• Java Abstract class HackerRank
• Interface HackerRank
• Method Overriding I HackerRank
• Method Overriding II (Use super keyword) HackerRank
• Java instanceof keyword HackerRank
• Java Iterator HackerRank