indexOf() - String Methods in Java

This article is a part of String Methods in Java.
The indexOf() method returns the index within the string of the first occurrence of the specified character. The parameter passed in this method can be of String type which represents the string to be searched, or of char type representing a character to be searched. We can pass one more parameter fromIndex which indicates the index from where the search should begin.

Return type

The return type of indexOf() method is an int value. The integer represents the first occurrence of the specified parameter, if the output is -1 then it represents that the specified parameter never occurs.
Let us look at an example for this method.

public class string_methods { public static void main(String[] args) { String str = "LearningJournal is a MOOC Portal"; System.out.println(str.indexOf("a")); System.out.println(str.indexOf("a", 5)); System.out.println(str.indexOf("is")); System.out.println(str.indexOf("z")); } }

Output

Let us look at the output of the above.

String Methods indexOf() — Fig.1- String Method - indexOf()

indexOf() - String Methods in Java

Return type

Output

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Author : Satyam Kumar -

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