學號 2017-2018-20172309 《程序設計與數據結構》第4周學習總結

教材學習內容總結

盡量簡單的總結一下本周學習內容
盡量不要抄書，浪費時間
看懂就過，看不懂，學習有心得的記一下

教材學習中的問題和解決過程

• 問題1：XXXXXX
• 問題1解決方案：XXXXXX
• 問題2：XXXXXX
• 問題2解決方案：XXXXXX
• ...

代碼調試中的問題和解決過程

• 問題1：XXXXXX
• 問題1解決方案：XXXXXX
• 問題2：XXXXXX
• 問題2解決方案：XXXXXX
• ...

代碼托管

（statistics.sh腳本的運行結果截圖）

上周考試錯題總結

• 錯題1及原因，理解情況：
  If two variables contain aliases of the same object then
  A . the object may be modified using either alias
  B . the object cannot be modified unless there‘s but a single reference to it
  C . a third alias is created if/when the object is modified
  D . the object will become an "orphan" if both variables are set to null
  E . answers A and D are correct

  正確答案：E 我的答案：A
  錯誤原因：選項沒有看完，導致沒有選D。

• 錯題2及原因，理解情況
  What happens if you attempt to use a variable before it has been initialized?
  A . A syntax error may be generated by the compiler
  B . A runtime error may occur during execution
  C . A "garbage" or "uninitialized" value will be used in the computation
  D . A value of zero is used if a variable has not been initialized
  E . Answers A and B are correct

  正確答案：E 我的答案：B
  錯誤原因：沒有正確的認識語法錯誤，語法錯誤就是編輯時的錯誤，俗稱病句。

• 錯題3及原因，理解情況：
  What is the function of the dot operator?
  A . It serves to separate the integer portion from the fractional portion of a floating point number
  B . It allows one to access the data within an object when given a reference to the object
  C . It allows one to invoke a method within an object when given a reference to the object
  D . It is used to terminate commands (much as a period terminates a sentence in English)
  E . Both B and C are correct

  正確答案：E 我的答案：B
  錯誤原因：在課本上只看到了C的相關語句，所以直接選了C

• 錯題4及原因，理解情況：
  Consider the following two lines of code. What can you say about s1 and s2?!
  String s1 = "testing" + "123";
  String s2 = new String("testing 123");
  A . s1 and s2 are both references to the same String object
  B . the line declaring s2 is legal Java; the line declaring s1 will produce a syntax error
  C . s1 and s2 are both references to different String objects
  D . s1 and s2 will compare "equal"
  E . none of the above

  正確答案：C　　我的答案：B
  　　錯誤分析：以為S１是錯誤的語法，後來才發現沒有問題。回去後直接試了下發現它們都是對的。

• 錯題５及原因，理解情況：
  The String class‘ compareTo method
  A . compares two string in a case-independent manner
  B . yields true or false
  C . yields 0 if the two strings are identical
  D . returns 1 if the first string comes lexically before the second string
  E . none of the above

  　正確答案：C　　　我的答案：D　
  錯誤分析：沒有正確理解題目的意思，我的理解為：“class”與“method”相比。題目的意思為：“使用String類char　compareTo（）方法的輸出。輸出規則是：按照字典順序＋０－分別表示先於、等於、後於ＳＴｒ字符串。

其他（感悟、思考等，可選）

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學習進度條

參考文獻

1.Java語言中的錯誤
2.
3.

學號 2017-2018-20172309 《程序設計與數據結構》第4周學習總結