英文作业：IO流读取txt文件，并计算最高分 文件复制 查找

java无忧网

Assignment #8

The records of the students enrolled in a hypothetical computer science class, along with all the relevant information, are kept in the data file classLis.txt

Design and implement a java application to facilitate access to the student records.

The following is a screen sample of the program:

  Please enter:

1. To display a specific student’s record.

2. To calculate the final exam average.

3. To find a student with the highest score on the final exam.

4. To copy the students’ record to another file.

5. To terminate the program.

1

Please enter the student’s name: Annette Adams  

   Name: Annette Adams

   ID: 18273640

   Final: 98

Please enter:

1. To display a specific student’s record.

2. To calculate the final exam average.

3. To find a student with the highest score on the final exam.

4. To copy the students’ record to another file.

5. To terminate the program.

1

Please enter the student’s name: Mark Smith

   No match

Please enter:

1. To display a specific student’s record.

2. To calculate the final exam average.

3. To find a student with the highest score on the final exam.

4. To copy the students’ record to another file.

5. To terminate the program.

2

The final exam average is: 80.43478

Please enter:

1. To display a specific student’s record.

2. To calculate the final exam average.

3. To find a student with the highest score on the final exam.

4. To copy the students’ record to another file.

5. To terminate the program.

3

The student with highest score to the final exam:

     Name: Aleksei Titov

     ID: 92839443

     Final exam score: 99

Please enter:

1. To display a specific student’s record.

2. To calculate the final exam average.

3. To find a student with the highest score on the final exam.

4. To copy the students’ record to another file.

5. To terminate the program.

4

Please enter the file name:

ClassListCopy.txt

Please enter:

1. To display a specific student’s record.

2. To calculate the final exam average.

3. To find a student with the highest score on the final exam.

4. To copy the students’ record to another file.

5. To terminate the program.

5

Program terminates

The classList.txt file has been created for you.

               

Marking Scheme

[2 marks] Presentation/Style: Organization, readability, descriptive identifier,

                 indentation, bracket placement

[16 marks] Correctness: Program works without bugs. Use of appropriate methods.

[2 marks] Comments

此源码经过详细测试 保证能运行！！！


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英文作业：IO流读取txt文件，并计算最高分 文件复制 查找

报空指针异常：
Exception in thread "main" java.lang.NullPointerException
        at java.io.Reader.<init>(Unknown Source)
        at java.io.InputStreamReader.<init>(Unknown Source)
        at a8.main(a8.java:23)