题解 | 【java】#截取字符串#

代码量相对较少的实现

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            String str = sc.next();
            int num = sc.nextInt();
            System.out.println(str.substring(0,num)); //截取字符串，从0到num
        }
        sc.close();
    }
}