![]() ![]() This example will help us understand the public int indexOf(int char) method. In the first example below, we'll find the index of a single character in a string. str represents a substring in a string.ĭon't worry if you don't yet understand how any of this works – the examples will make it all clear! How to Use the indexOf Method in Java.With this parameter, you can tell the indexOf method where to start its operation from. This is important where you have two characters/strings that have the same value in a string. ![]() fromIndex signifies the position where the search for the index of a character or substring should begin.Keep doing that until indexOf returns -1. char represents a single character in a string. After you've found the first index, use the overloaded version of indexOf that receives the start index as a second parameter: public int indexOf (int ch, int fromIndex) Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index.Let's explain these parameters before seeing some examples: Public int indexOf(String str, int fromIndex) Public int indexOf(int char, int fromIndex) The indexOf method has the following methods: public int indexOf(int char) You can use contains(), indexOf() and lastIndexOf() method to check if one String contains another String in Java or not. We'll also look at some examples to help you understand and use them effectively to find the index of a character or substring in your Java code. In this article, we'll see the syntax for the different indexOf methods. The indexOf method returns the index position of a specified character or substring in a string. A string is a collection of characters nested in double quotes. ![]()
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