</pre>
/*Copyrights to vsdevelopers.io*/
/*For more programs visit vsdevelopers.io */
/*Java program to find occurrences of substring in a string*/
import java.util.Scanner;

public class VSDSubString {
// Method to find substring in string
public static void VSDfindSubString(String s, String sub) {
int flag = 0;// To mark the occurrence of string
// The length of substring must be less than or equal to the length of main
// string
if (sub.length() <= s.length()) {
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == sub.charAt(0)) {
int end = i + sub.length();
if (end <= s.length()) {
String temp = s.substring(i, end);
if (sub.equals(temp)) {
flag = 1;
System.out.println("Given substring is present at index:" + i);
}
}
}
}
if (flag == 0)
System.out.println("Given substring is not present");
} else
System.out.println("Given substring is not present");
}

public static void VSDuserInput() {
Scanner sc = new Scanner(System.in);
System.out.println("Enter main string");
String s = sc.next();
System.out.println("Enter sub string");
String sub = sc.next();
VSDfindSubString(s, sub);
}

public static void main(String args[]) {
VSDuserInput();// Function to read strings given by user
}
}
<pre>