Question

Write a difference between the functions isUpperCase() and toUpperCase().

Differentiate between isUpperCase() and toUpperCase().

Answer 1

The isuppercase() method is used to check whether the given character is in upper case or not. It returns a Boolean data type.

The toUpperCase() method is used to convert a character or string into upper case. It returns char or String type. 

Answer 2

Sr. No.	isUpperCase()	toUpperCase()
1.	The isuppercase() method is used to check whether the given character is in upper case or not. It returns a Boolean data type.	The toUpperCase( ) method is used to convert a character or string into upper case. It returns char or String type.
2.	This function returns true if the parameter is an uppercase letter, and false otherwise.	This function returns the supplied argument in uppercase characters. If a character is already in uppercase, it remains unchanged. If the supplied character is not a letter, it will be returned as is.
3.	Syntax:  boolean isUpperCase = Character.isUpperCase(characterVariable);	Syntax: char uppercaseChar = Character.toUpperCase(characterVariable);
4.	Example: boolean p = Character.isUpperCase('c'); // returns false	Example: char p = Character.toUpperCase('y'); // returns Y char p = Character.toUpperCase('Y’); // returns Y char p = Character.toUpperCase('?'); // returns ?