Str.toLowerCase().includes(substr.toLowerCase()) Here is our sample Java program to demonstrate how to use the indexOf() and contains() method to check if one String contains another substring in Java or not.To perform a case-insensitive check, convert both the string and the substring to lowercase before calling includes() on the string. Java Program to check if one String contains another This is one of the best and up-to-date courses to learn Java online. Let's see some examples of contains() and indexOf() to demonstrate how you can use this method to search for a substring in a string in java.Īnd, If you are new to the Java world then I also recommend you go through The Complete Java MasterClassonline course to learn Java in a better and more structured way. The only difference between contains() and indexOf() is that the former returns a boolean value while later returns an int value.
This method returns true if a substring is present in String, or false otherwise. The third method you can use to check if one String contains another in Java is contains() method of String. The second method is lastIndexOf() which is similar to indexOf() but starts the search from the tail, but it will also return -1 if the substring is not found in the String or the last position of the substring, which could be anything between 0 and length -1. This is the easiest way to test if one String contains another substring or not. For example "fastfood".indexOf("food") will return 4 but "fastfood".indexOf("Pizza") will return -1. The indexOf() method accepts a String and returns the starting position of the string if it exists, otherwise, it will return -1. If a String contains another String then it's known as a substring. You can use contains(), indexOf() and lastIndexOf() method to check if one String contains another String in Java or not.
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