201621123047 Java programming 10th Week of study summary

1. Summary of this week's study

1.1 Summarize abnormal content in the way you like (mind map or other).

1. Written work

This PTA job problem set anomaly

1. Common exceptions

Combined Topic 7-1 Answer
1.1 What exceptions do you often have in code that you have written before, and what do you need to capture (why)? What should be avoided?
1.2 What kind of exception requires the user to be sure to use capture processing?

1. Handle exceptions to make your program more robust

Topic 7-2
2.1 Experimental summary. And answer: How can you make your program more robust?

1. Throw and throws

Topic 7-3
Read Integer.parsetint source code
3.1 Integer.parsetint There is a lot of code thrown out of the exception at the outset, what is the benefit of this practice?
3.2 What information do you usually need to pass to the caller when you write your own program with 3.1 and analyze your own method of throwing an exception?

1. Improve Arrayintegerstack with exception

Topic 6-3
4.1 In combination with 6-3 code, how does it benefit to use an exception-throwing method to represent a program run-time error? What is the advantage of returning an error value more than a simple one?
4.2 If the inner code of a method throws an exception of type RuntimeException, does the method declaration use the throws keyword, and if the exception that is thrown by the method is declared using the throws keyword, what benefit can it bring us?

1. Function questions-Capture of multiple exceptions

Topic 6-1
5.1 Combined with 6-1 code, answer: If you can throw multiple exceptions in a try block, and there may be an inheritance relationship between exceptions, what do you need to be aware of when capturing?
5.2 If you can throw multiple exceptions in a try block, what do you need to be aware of when using Java8 's multiple exception capture syntax?

1. Add exception handling to the following code

byte[] content = null;
FileInputStream fis = new FileInputStream ("Testfis.txt");
int bytesavailabe = fis.available ();//Gets the number of bytes available for the file
if (bytesavailabe>0) {
Content = new byte[bytesavailabe];//Create an array that can hold the file size
Fis.read (content);//Read the contents of the file into an array
}
System.out.println (arrays.tostring (content));//print array contents
6.1 Correct the code and add the following functions. When the file cannot be found, you need to prompt the user not to find the file xxx, retype the file name, and then try to open it again. If it is another exception, prompt to open or read the file failed!.
Note 1: There are several methods inside that can throw an exception.
Feature 2: You need to add a finally close file. Regardless of whether the above code produces an exception, always be prompted to close the file ing. If closing the file fails, the prompt to close the file failed!
6.2 Combining the title set 6-2 code, what kind of action to put in the finally block? Why? What do I need to be aware of when closing resources using finally?
6.3 Use try-with-resources in Java7 to rewrite the above code to automatically close the resource. What are the benefits of this approach?

1. Object-oriented design job-Library management system (group completion, no more than 3 students per group)

Log in to lib.jmu.edu.cn to search for books. Then log in to the library information system to view my library. If you want to implement a book borrowing system, try using object-oriented modeling.
7.1 Who is the user of this system?
7.2 Main function modules (not too many) and the owner of each module. Next week everyone is going to submit their own module code and run the video.
7.3 Main class design and class diagram of the system (available)
7.4 How you plan to store library information, address information, reader information, and more.

1. Optional: Use exceptions to improve your shopping cart system

Give 1 examples of how you can use the exception handling mechanism to make your program more robust.
The description consists of 2 parts: 1. The problem description (where the exception is encountered). 2. Solution (Key Code)

1. Optional: Scan your shopping cart code with the static Code scanning Tool

8.1 Analyze the problems in your own code that arise in terms of specifications.
8.2 Think about how to solve these problems.

3. Code Cloud and PTA

Topic Set: Exceptions

3.1. Code Cloud codes Submission record

In the Code cloud Project, select statistics-commits history-set time period, and then search for and
3.2 PTA Problem set complete situation diagram

Two graphs are required (1. Ranking chart. 2.PTA Submission list diagram)

3.3 Count the amount of code completed this week

The weekly code statistics need to be fused into a single table.

Option: 4. Expand

Extracurricular exercises

Javatutorial in questions and exercises
Practice Summary

Extracurricular reading

Select one of the following articles to read and enumerate some of the best practices for exception handling that you can understand.
Best Practices for Exception handling
Exception-handling Antipatterns Blog
The Exceptions debate

Optional: 5. Use Java to solve practical problems (attendance Auto-statistics)

Association check-in, each time using a paper signature table to check in, go back and then manually statistics. If you have more than one signature table, manual statistics are required. Now keep the paper signature method unchanged, responsible for each time the paper signature table will be manually entered after the system, so that the data can be automatically counted. What functional modules are required to implement such a system? Trying to encode the implementation?

201621123047 Java programming 10th Week of study summary