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Java String indexOf() Method

Last Updated : 19 Nov, 2024

In Java, the String indexOf() method returns the position of the first occurrence of the specified character or string in a specified string. In this article, we will learn various ways to use indexOf() in Java.

Example:

Below is the simplest way that returns the index of the first occurrence of a specified character in a string, or -1 if the character does not occur.

Java

// Java code to demonstrate the working of String indexOf()
// using indexOf(char ch)

public class Index1 {
  
    public static void main(String args[]) {
      
        String s = new String("Welcome to geeksforgeeks");

        System.out.print("Found g first at position: ");

        System.out.println(s.indexOf('g'));
    }
}

Output

Found g first at position: 11

Explanation:

In the above example, it finds the first occurrence of the character g in the string "Welcome to geeksforgeeks" and prints its index i.e. 11.

Table of Content

Different Variants of indexOf() Method in Java

indexOf(char ch, int strt)
indexOf(String str)
indexOf(String str, int strt)

Different Variants of indexOf() Method in Java

There are 3 variants of the indexOf() method are mentioned below:

1. indexOf(char ch, int strt)

This method returns the index of the first occurrence of the specified character by starting the search at the specified index.

Example:

Java

// Java code to demonstrate the working of String indexOf(char ch, int strt)
public class Index2 {
  
    public static void main(String args[]) {
      
        String s = new String("Welcome to geeksforgeeks");

        System.out.print(
            "Found g after 13th index at position: ");

        System.out.println(s.indexOf('g', 13));
    }
}

Output

Found g after 13th index at position: 19

2. indexOf(String str)

This method returns the index of the first occurrence of the specified substring in the string.

Example:

Java

// Java code to demonstrate the working of String indexOf(String str)

public class Index3 {
  
    public static void main(String args[]) {
      
        String s = new String("Welcome to geeksforgeeks");

        // Initializing search string
        String s1 = new String("geeks");

        // print the index of initial character of Substring
        System.out.print(
            "Found geeks starting at position: ");
        System.out.print(s.indexOf(s1));
    }
}

Output

Found geeks starting at position: 11

3. indexOf(String str, int strt)

This method returns the index of the first occurrence of the specified substring by starting the search at the specified index.

Example:

Java

// Java code to demonstrate the working of String indexOf(String str, int strt)
public class Index4 {
  
    public static void main(String args[]) {

        String s = new String("Welcome to geeksforgeeks");

        // Initializing search string
        String s1 = new String("geeks");

        // print the index of initial character
        // of Substring after 14th position
        System.out.print(
            "Found geeks(after 14th index) starting at position: ");
        System.out.print(s.indexOf(s1, 14));
    }
}

Output

Found geeks(after 14th index) starting at position: 19

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