How to find substring without String methods using char arrays?

Question

You are not allowed to use any inbuilt functions like indexOf(), contains() or matches() of String class.

Find string apple in string webapple using given char arrays?

String webapple ="webapple";
String apple="apple";
char[] webappleArray=webapple.toCharArray();
char[] appleArray = apple.toCharArray();

write a function

public boolean isPresent(char[] apple ,char[] webapple ){
    //your code here 
}

Answer 1

I add it here in case someone really need it or want to study from it:

public static void main(String[] args) {
    String webapple = "webapple";
    String apple = "apple";
    char[] webappleArray = webapple.toCharArray();
    char[] appleArray = apple.toCharArray();
    System.out.println(isPresent(appleArray, webappleArray));
}

public static boolean isPresent(char[] apple, char[] webapple) {
    for (int i = 0; i < webapple.length - apple.length+1; i++) {
        for (int j = 0; j < apple.length; j++) {
            if (webapple[i + j] == apple[j]) {
                if (j == apple.length - 1) {
                    return true;
                }
            } else {
                break;
            }
        }
    }
    return false;
}