求助大佬们,StringBuffer不加“***“就导致输出为空 怎么解啊 import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); StringBuilder m1=new StringBuilder(sc.next()); // test2(m1); } static void test2(StringBuilder m1){ for (int j =m1.length(); j ...