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Know some basic points in Java.
Each Java Developer should know these Key Points.
Either you are preparing for java interview or having great view to know about Java then, Always remember these Points.
- Due to security reasons, it is not possible to perform file operation from an applet.
- When a simple type is passed to a method, it is done by use of Call by Value. Objects are passed by use of Call by Reference.
- It is illegal to refer to any instance variables inside of a static method.
- All command-line arguments are passed as a strings. We must therefore convert numeric values to their original forms manually.
- A class member declared as a private will remain private to its class. It is not accessible by any code outside its a class including sub classes.
- The star form of import statement may increase compile time it will be good practice to explicitly name the classes that we want to use rather than importing whole packages.
- Interfaces add most of the functionality that is required for many applications which would normally require the use of multiple inheritance in C++.
- When we implement an interface method, it must be declared as a public.
- If a finally block is associated with a try, the final will be executed upon conclusion of the try.
- Java uses pointers internally to store references to objects or for elements of any array of objects. However these pointers are not available for use by programmers.
- We cannot overload methods with a difference only in their return type.
- When a method with the same name signature of both the super class and subclass, the method in the subclass overrides the method in the super class.
- Every constructor must invoke its super class constructor in its first statement. Otherwise, the default constructor of the super class will be called.
- A class is a final cannot be inherited.
- A method marked final cannot be overridden.
- Sub classes of an abstract class that don't provide an implementation of an abstract method, are also abstract.
Learn To Implement,Not To Make Garbage
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