Java String indexOf() Method

// 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'));
    }
}

// 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));
    }
}

// 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));
    }
}

// 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));
    }
}