求两个串的最大子序列（非字串）

import java.util.Set;
import java.util.StringJoiner;

public class Main {
    public static int getL(String a, String b) {
        if (a.isEmpty()||b.isEmpty())
            return 0;
        if (a.charAt(0) == b.charAt(0))
            return getL(a.substring(1), b.substring(1)) + 1;
        else
            return Math.max(getL(a.substring(1), b), getL(a, b.substring(1)));
    }

    public static void main(String[] args) {
        int result = getL("abcfsdgsdgas", "xbaebcdasdasfasfdw");
        System.out.println(result);
    }
}