Question

A. What are Objects?

B. How do Objects differ from Classes?

C. Where are Objects stored in Memory?

D. Why do you not need to declare when you are finished using an Object in Java?

E. Can you edits the contents of a String?

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12pt

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Answer 1

A. An object is an instance of a class or a member of a class.

For Example, Pen is an object. Its state is its name that is cello and its color is blue. It is used to write, so writing is its behavior.

B. Object is a member of a class where the class is something from which objects are created. The object is a real-world entity such as a pen, laptop, mobile, bed, keyboard, mouse, chair, etc where the class is a group of similar objects.

C. The addresses of objects are stored in stack memory and the object values are stored in heap memory. An object reference on the stack is only an address that refers to the place in heap memory where that object is kept.

D. There is no need to declare when you are finished using an object in Java because Java memory management is automatic, you don't need to deallocate the memory an object uses when you're finished using it. When you are finished with an object you have created, Java can determine that the object no longer has any live references to it.

E. No it is impossible to change the content of string in java because strings are immutable. Once you have created a string you cannot later change that string object.

Keyboard shortcuts in Java

1. Ctrl + Shift + T - It is used for finding class even from a jar

2. Ctrl + Shift + R - It is used for finding any resource