OBJECT CLASS,STRING CLASS IN JAVA

Object class:

It is a super class for every class we create in java.

Whenever we create an object for any class, it will load non static info (stub) related to that class as well as the complete stub of object class also into the memory location created for that object, so using the same reference we can use the non-static stub of that class as well as the complete stub of the object class in our program.

Note: object class is a special predefined class   

String class:

It is a predefined class in java which contains some predefined functions to perform different operations on string. We can call all those functions in our programs by creating a reference to the String class.

Predefined string functions in java useful for testing are as follows

Length (): finds the length of the string

Equals (): compares two strings, returns

 True if both are matching else returns

 False

subString(): selects a part of a string

indexOf():finds a word or a char in the

 string then returns index of the string ,

 if not find then returns -1

split(): splitting a string