软件测试技术_随堂练习01答案.docxVIP

随堂练习01FindBugsA.查看 FindBugs发现的问题，一共有几类问题，各是什么含义？将这几类问题翻译成中文；答：一共有以下三种类型的问题：1. Bug: Invocation of toString on combination in solver.Matrix.main(String[])The code invokes toString on an array, which will generate a fairly useless result such as [C@16f0472. Consider using Arrays.toString to convert the array into a readable String that gives the contents of the array. 中文：在组合代码调用toString数组,这将产生一个相当无用的结果。考虑使用Arrays.toString方法将数组转化成可读的字符串。2. Bug: solver.Mpute() concatenates strings using + in a loopThe method seems to be building a String using concatenation in a loop. In each iteration, the String is converted to a StringBuffer/StringBuilder, appended to, and converted back to a String. This can lead to a cost quadratic in the number of iterations, as the growing string is recopied in each iteration. Better performance can be obtained by using a StringBuffer (or StringBuilder in Java 1.5) explicitly.中文：这个方法似乎是建立在一个循环中使用连接字符串。在每个迭代中,字符串转换为StringBuffer / StringBuilder,附加到,转换回一个字符串。这可能导致成本数量的二次迭代,在每个迭代字符串复制。可以获得更好的性能通过使用StringBuffer显式(或StringBuilder Java 1.5中)。 3. Bug: Unread field: gui.MainWindow.m_gameOutputThis field is never read. Consider removing it from the class.中文：gui.MainWindow.m_gameOutput这个属性没有被读。这个字段是不会被程序读的。考虑把它从类中移除。B.如何解决 FindBugs指出的问题？请修改Sudoku程序，以改正所有 FindBugs指出的问题。注意：同类错误仅需记录一次修改思想即可。答：使用Arrays.toString将数组转换为字符串。将String类型的该变量定义为StringBuffer类型的，并在循环体中用append（）方法替代+操作。通过”查找”找出对应的属性的所有代码，并注释\删除。（或者调用print方法输出该属性）Junit源程序:package sale;public class SaleMachine {private int countOfBeer, countOfJuice, countOfFiveCents, countOfOneDollar;private String[] typeOfGoods = {Beer, Juice};private String resultOfDeal;public SaleMachine(){initial();}public void initial(){//默认售货机countOfBeer = 3;countOfJuice = 3;countOfFiveCents = 3;countOfOneDollar = 3;}public SaleMachine(int fiveCents, int oneDollar, int numOfBeer, int numOfOrange)//带参数的初始化售货机{countOfFiveCents = fiveCents;countOfOneDollar = oneDollar;countOfBeer = numOfBeer;countOfJuice = numOfOrange;}public String current