20165202 2017-2018-2 "Java Programming" 1th Week study Summary

20165202 2017-2018-2 "Java Programming" 1th Week study summary Summary of learning contents of textbook

• Installing the JDK in Ubuntu environment
• Simple Java Program Writing
• Anti-compiler Javap.exe
• How to install and use Git
• Learn how to use vim

problems in teaching materials learning and the solving process

• Java cannot be installed in Ubuntu
  Workaround:
  Refer to "How to install Java 9 in Ubuntu via PPA"
  Add webupd8team Java 9 PPA Library to the system and install Oracle Java 9
  $ sudo add-apt-repository ppa:webupd8team/java $ sudo apt-get update $ sudo apt-get install oracle-java9-installer

  Verifying the Java version
  $ java -version

• Code cloud hosting fails to get public key
  

  Workaround:
  Refer to Hudonghui seniors ' use git to push code to open source China and IDEA environment
  

  During the installation, ask if you want to modify the environment variables and select the second item "Use Git from the Windows command Prompt" to run the Git command in Windows command-line cmd (which is handy)
  Use the GIT installation path to find a hit git-bash.exe , double-click to run, and enter the following commands in the command window that pops up
  ssh-keygen -t rsa -C "[email protected]"

Continuous input enter, a folder named. SSH is generated under the current User folder, open the file named in the folder with Notepad id_rsa.pub and copy all of the contents. To get the public key

Problems in code debugging and the resolution process

• vi src/Hello.javacannot be entered by editing code
  Workaround: Learn how to use vim
  I edit at the current cursor
  I Insert at the beginning of the line
  A inserts at the end of A row
  A inserts an edit after the cursor
  o Insert a new row after the current line
  O insert a new row before the current line
  CW replaces characters from the position of the cursor to the end of a word
  Input from Normal mode: Enter command line mode, enter WQ carriage return, save and exit edit

• git add .Command not valid

解决方法：输入git init建立空仓库

• git pushError: no corresponding upstream branch
  Workaround:
  Create an empty warehouse in the correct path, such as cd 20165202jhs entering the directory where the clone project resides

• vim run.shsimplifying the compilation process by writing a script does not open
  Workaround:
  Vim usage not installedsudo apt-get install vim

• Script failed to run

Workaround
Reminds me to pay attention to the case and the Chinese and English input method problems, ";" and ":" The difference is very big

Code Hosting

Code Cloud Link

last week's summary of the wrong quiz

1. The following description of the characteristics of the Java language, the correct group is
C. Object-oriented; platform-independent; dynamic

20165202 2017-2018-2 "Java Programming" 1th Week study Summary