题解 | #按照格式输入并交换输出#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        //找等号以后以及逗号以前的位置
        int i1 = str.indexOf(",");
        int i2 = str.indexOf("=");
        String str1 = str.substring(i2+1,i1);
        String str2 = str.substring(i1 + 3);
        System.out.println("a=" + str2 + ",b=" + str1);
    }
}