14 May String indexOf (String str) method in Java

The indexOf(String str) method in Java returns the index within this string of the first occurrence of the specified substring.

Syntax

Let us see the syntax,

int indexOf(String str)

Parameters

Let us see the parameters,

• str– string

Example

The following is an example of indexOf(String str),

public class StudyopediaDemo {

   public static void main(String args[]) {
	 
      String message = new String("Studyopedia provides free learning content!");
      
      System.out.println("String:"+message);
	  
      System.out.print("SubString: ");
      System.out.println("learning");
	
      System.out.println("Index of substring: "+message.indexOf("learning"));
  } 
}

Output

The following is the output,