Java Class 25 Part 2 Access modifiers & Exception handling (4/4/2023)

Part 1 Link : - https://youtu.be/nMy9C7cgm20

Access modifiers:- access modifiers in java to define the scope of class, methods, variables and constructor.
We have 4 types of access modifiers-
 Public
 Private
 Protected
 Default

1. Public: using public access modifiers we can access anywhere inside the class outside the class or inside the package and inside the package.
2. Private: using private access modifiers we can access only inside the class. We can’t access outside the class.
3. Protected: using protected modifiers we can access only parent and child relation-ship. But both are the classes in different – different packages.
4. Default: using default we can access only inside the package we can’t access outside the package.

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Exception handling: Exception handling to handle the run time of exception. Or we can say in exception handling to maintain flow of the code. Exception we have 2 types-
Checked exception
Unchecked exception

1. Checked exception: checked exception we can say compile time.
2. Unchecked exception: unchecked exception we can say run time.

We only handle the unchecked exception using exception handling.
We have face multiples types of unchecked exception-
a. Null pointer
b. Arithmetic
c. Number format
d. Input miss match
e. Array index out of bound
Like that

We have 5 keyword to use in exception handling
 Try
 Catch
 Finally
 Throw
 Throws