[JAVA] CH13 check the char string

/*
    Use recursion to implement a method boolean find(String t) that tests whether a string is contained in a sentence:
        Sentence s = new Sentence("Mississippi");
        boolean b = s.find("sip"); // return true
    Hint: If the text starts with the string you want to match, then you are done. If not, consider the sentence that you obtain by removing the first character
 
http://snippets.dzone.com/posts/show/4908
*/
 
import java.util.Scanner;
public class Sentence
{
    public int max;
    public int maxNumBase;
    public int maxNumSub;
    public int i;
    public String base;
 
    public Sentence(String word)
    {    base = word;   }
 
    public boolean find(String str)
    {
        int m = 1;
        maxNumBase = base.length();
        max = maxNumBase - 1;
        for(i=1;i<max;i++)
        {
            if(base.charAt(i) == str.charAt(m))
            {
                m++;
                if(m == 3)
                {   return true;    }
            }
            else
            {
                if(m != 0)
                {   i--; m--;    }
            }      
        }
        return false;           
    } 
}
 
/**
    Base.java
    main here
*/
 
import java.util.Scanner;
 
public class Base
{
    public static void main(String[] args)
    {
        Sentence s = new Sentence("Mississippi");
        boolean b = s.find("sip");
        System.out.println("*** Sentence.java ***");
        System.out.println("This is "+ b );
    }
}