题解 | #截取字符串#

主要用StringBuffer的setLength方法

public class Main{
	public static void main(String[] args){		Scanner sc = new Scanner(System.in);
		while(sc.hasNext()){
			String str = sc.nextLine();
			int a = sc.nextInt();
			StringBuffer sb = new StringBuffer(str);
			sb.setLength(a);
			System.out.println(sb.toString());
			sc.nextLine();
		}
	}
}