Access Modifiers

Question 1

Access Modifiers / Visibility Modifiers

Answer 1

PUBLIC ->   PROJECT
PRIVATE->  CLASS
Protected -> determined by parent child relationship
- NO INHERITANCE -> default -> PACKAGE
- INHERITANCE -> public -> PROJECT

if non of the above are provided then it will be DEFAULT -> PACKAGE

Question 2

Non Access Modifiers

Answer 2

1. Static

2. Final

Question 3

Access Modifiers & Non Access Modifiers

CLASS

Answer 3

• Class can be public or default
• Class can be final: cannot be parent anymore
• Inner class can be static
• Outer class cannot be static

public class Table{
   public static DiningTable{
      public static String material = "wood";
   }
}

Question 4

Access Modifiers & Non Access Modifiers

CONSTRUCTOR

Answer 4

private constructor: create object in same CLASS

default constructor: create object in same PACKAGE

protected constructor: based on having inheritance

• NO INHERITANCE -> default -> PACKAGE
• INHERITANCE -> public -> PROJECT

public constructor: create objects in PROJECT

Can never be static nor final (compiler error)

Question 5

Access Modifiers & Non Access Modifiers

INSTANCE VARIABLES

Answer 5

private instance variables: CLASS

default instance variables: PACKAGE

protected instance variables: based on inheritance

• NO INHERITANCE -> default -> PACKAGE
• INHERITANCE -> public -> PROJECT

public instance variables: PROJECT

static instance variable: it belongs to Class and can be called with class name

final instance variable: it has an initial value instantiated in the Class and this initial value can never be changed

Question 6

Access Modifiers & Non Access Modifiers

METHODS

Answer 6

private methods: CLASS

default methods: PACKAGE

protected methods: based on inheritance

• NO INHERITANCE -> default -> PACKAGE
• INHERITANCE -> public -> PROJECT

public methods: PROJECT

static methods: it belongs to class and can be called with class name

final methods: can not be overridden