The toUpperCase() method is a built-in function in Java that converts all the characters in a string to uppercase letters.
Think of the toUpperCase() method as a magical spell that transforms lowercase letters into uppercase ones, just like how waving a wand can turn a frog into a prince.
toLowerCase(): This is another built-in function in Java that converts all the characters in a string to lowercase letters.
charAt(): This method returns the character at a specified index position within a string.
length(): The length() method returns the number of characters in a string.
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