longestCommonSubstring Java Programming (Regressive Method)

class longestCommonSubstring{

    public static int lcs(String str,String str2,int n,int m){
        if(m<0||n<0){
            return 0;
        }
        else if(str.charAt(n)==str2.charAt(m)){
            return 1+lcs(str,str2,n-1,m-1);
        }
        else{
            return max(lcs(str,str2,n-1,m),lcs(str,str2,n,m-1));
        }
    }

    public static int max(int a,int b){
        if(a>b){
            return a;
        }
        else{
            return b;
        }
    }

    public static void main(String[] args){
        String str1="abcdefgh";
        String str2="eghabcd";

        System.out.println(lcs(str1,str2,str1.length()-1,str2.length()-1));
    }

}

output:

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