20175319 2018-2019-2 《Java Programming 》 The first 2 Weekly learning summary
Summary of the learning content of the textbook
- The second week I learned 《Java2 Practical tutorial 》 Chapter two 、 The third chapter is about Java Basic data types and arrays , Operator 、 Expressions and statements , This part is similar to what I learned last year C Language has similar parts , But it's different , So in the beginning , Often because of subconscious use C The way the language is written leads to mistakes .
- install Intellj IDEA, As the application for the free version of the student has not yet passed , Temporary use Visual studio Code..
Problems and solutions in textbook learning
- problem 1： The first 2 Chapter two examples 1 There is a Japanese character that cannot be typed in , Later, after typing this character through Baidu , Found characters in Unicode The position on the table is different from that in the textbook .
- problem 1 Solution ： Search the tutorial of the senior in blog Garden Linux Download the Japanese input method , Successfully played あ, stay Java Through verification , Found two あ Not the same character .
- problem 2： The first 3 Chapter two examples 9 appear
import java.util.*There is no explanation in the textbook .
- problem 2 Solution ： After searching for information on the Internet, I learned that import Statement is the class interface in the package needed for import ,java.util Bag is Java Utility class library for ,
import java.util.*On behalf of you importing java.util All classes in the package , In this way, we can only specify a class by its name in our code , For example, in the example
Scanner reader=new Scanner(System.in)If it doesn't work import You need to input
java.util.Scanner reader = new java.util.Scanner(System.in)
Problems and resolution in code debugging
- problem 1： Force the virtual machine to shut down at one time , It can't start normally when restarting again , This is a problem
- problem 1 Solution ： In limine , Follow the instructions on the Internet
journalctl -xbView log output , Again
/fsck failedSearch for mount errors .
At this time, the keyword cannot be found .
Found out after blue cloud asked for help , The tutorial I'm looking for is about dual systems , Not virtual machines , So I think that only the shared folder in my virtual machine may have the problem of Mount error , So type
vim /etc/fstab, use # Comment out the last line ,
Restart normal .
After cloning codecloud again on Sunday , Today's quantity becomes all quantity
Summary of wrong questions in last week's exam
- Due to not carrying the computer in advance in class, the test in class is overtime .
- The content of this week is related to C There are similarities between languages . So it's easier to understand , But we need to pay attention to the differences between the two .
- In the face of problems, too dependent on network search and students to answer , I don't want to think and practice first , It's harmful to one's study .
Learning progress bar
|Lines of code （ newly added / The cumulative ）||Amount of blog （ newly added / The cumulative ）||Learning time （ newly added / The cumulative ）||Important growth|
|The goal is||5000 That's ok||30 piece||400 Hours|
|The first week||156/156||1/1||20/20|
|In the second week of||275/431||1/2||22/42|
Try recording 「 Plan your study time 」 and 「 Actual study time 」, At the end of the period, see if you can improve your planning ability . This job is very important in study , It's also very useful. .
A formula for estimating time consumption
：Y=X+X/N ,Y=X-X/N, More training ,X、Y It's close .
Plan your study time :40 Hours
Actual study time :22 Hours
Improve the situation ：
( Take a look at it when you have time Modern software engineering Courseware
Software engineer ability self evaluation form )
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