Which of these class have only one field ‘TYPE’?

Which of the following is not an access modifier?

java.security package is used for handling security-related issues in a program 

Which of these access specifiers must be used for main() method?

Matcher class is interpreted both patterns and performs match operations in the string 

The process of defining a method that calls itself repeatedly is -

Which class acts as a superclass for both String and StringBuffer classes?

Which of the following is not mandatory in variable declaration``

What is implicit type casting in Java?