To find all occurrences of the character 'a' or the substring "Java" in the string, we can use the following code: The method returned the position 18, which is the starting position of the substring "programming" in the string.įinding all occurrences of a character or substring in the stringSuppose we have a string "Java is a popular programming language. In the above code, we first declared a string "Java is a popular programming language" and then used the indexOf() method to find the position of the substring "programming" in the string. Position of 'programming' in the string is: 18 ("Position of 'programming' in the string is: " + position) Int position = str.indexOf("programming") String str = "Java is a popular programming language" To find the position of the substring "programming" in the string, we can use the following code: This method determines the index value from where the string starts. In this example, we found that the character 'o' appears at positions 4 and 8 in the string "Hello, world!".įinding the position of a substring in the stringSuppose we have a string "Java is a popular programming language". The Java string indexOf() method returns an Integer data type value. We repeat this process until indexOf() returns -1, indicating that there are no more occurrences of the character in the string. We then used a while loop to continue searching for the character 'o' in the string by calling indexOf() with the character and the next starting position as arguments. The indexOf() method returns the position of the first occurrence of the character in the string, or -1 if the character is not found. In the above code, we first declared a string "Hello, world!" and then used the indexOf() method to find the position of the character 'o' in the string. ("Position of 'o' in the string is: " + position) To find the position of the character 'o' in the string, we can use the following code: Let's dive into the different ways in which we can use the `indexOf()` method.įinding the position of a character in the string:Suppose we have a string "Hello, world!". Public int indexOf(String str, int fromIndex) Public int indexOf(int ch, int fromIndex) Here is the syntax of the String indexOf(): If the character or substring is not found, the method returns -1. The indexOf() method in Java returns the position of the first occurrence of a character or a substring within a given string. Java String class indexOf(), which is used to manipulate strings. The indexOf() method in Java is a part of the String class, i.e.
Java provides a built-in method called indexOf() in the String class to help us with this task. What is Java String indexOf()?As a Java developer, you must have come across the need to find the position of a character or a substring within a string.
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