How do you check if a string contains a substring?

You can use contains(), indexOf() and lastIndexOf() method to check if one String contains another String in Java or not. If a String contains another String then it’s known as a substring. The indexOf() method accepts a String and returns the starting position of the string if it exists, otherwise, it will return -1.

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To check if a given string or a character exists in an another string or not in case insensitive manner i.e. by ignoring case, we need to first convert both the strings to lower case then use “ïn” or “not ïn” operator to check the membership of sub string .11 Oca 2022

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