public class Main { public static void main(String[] args) { Scanner scan = new Scanner(System.in); if(scan.hasNext()){ String str=scan.nextLine(); //相当于开辟了两段空间 int num = scan.nextInt(); //nextInt() 将输入的信息的下一个标记扫面为int System.out.print(str.substring(0,num)); } scan.close(); } }
