交换两个数
按照格式输入并交换输出
http://www.nowcoder.com/questionTerminal/95eb723a3e854376a7eb6d116cc7d875
import java.util.*; public class Main { public static void main(String[] args){ Scanner sc = new Scanner(System.in); String str = sc.nextLine(); int i = str.indexOf(','); System.out.printf("a=%s,b=%s", str.substring(i + 3), str.substring(2, i)); } }