ssd3答案,包括练习1到练习8，和日常练习1到9-the answer of the ssd3,including the exercise and the practical quiz.The exercise one to eight and the practical quiz one to nine.Exercise 1.ShoppingCartApplication

import java.io.*; import java.util.*; public class SecondsCalculator { private static BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in)); private static PrintWriter stdErr = new PrintWriter(System.err, true); private static P