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Showing content from https://www.tutorialspoint.com/java/java_string_indexof.htm below:

Java String indexOf() Method

This method returns the index within this string of the first occurrence of the specified character or -1, if the character does not occur.

Here is the syntax of this method −

public int indexOf(char ch)

Here is the detail of parameters −

• ch − a character.

• See the description.

import java.io.*;
public class Test {

   public static void main(String args[]) {
      String Str = new String("Welcome to Tutorialspoint.com");
      System.out.print("Found Index :" );
      System.out.println(Str.indexOf( 'o' ));
   }
}

This will produce the following result −

Found Index :4

java_strings.htm

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