Final Keyword in java

Final

Final is keyword in java

Final With Variable

Final Variable can be declared either block level or instance level

Final Variable can be initialized only once. Re-initialization causes a compile time error

Final Method

Final Methods behaves like constants these methods are not allowed to override in child classes

Final Methods won’t participate with abstract,private Keywords

Final Class

Final Class behaves like constant

Final Class can’t act as a base class in inheritace

Difference between String/String Buffer/String Builder

String

Immutable Object

It contains non-synchronized methods

String Buffer

Mutable Object

It contains synchronized methods

String Builder(from 1.5)

Mutable Object

It contains non-synchronized methods

jdbc

step 1: Get the Connection object.

step 2: Get the Statement object.

step 3: Bind the parameters to SQL query.

step 4: Execute the SQL query.

step 5: Process the result.

step 6: Close the connections and take care of exceptions.
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