Common operations of the command line

• win+r Open the command line run window .
  

• Input d： You can switch the drive letter to d disc , Switching to other drive letters is similar
  

• Input dir, You can view the directory of the current drive letter , It is equivalent to double clicking the folder in this computer
  

• Input cd Target file , You can open and enter the current file ( clip ) In go to
  

• Input javac +.java file , Is compiled java file , Bytecode files will be generated after compilation
  
  

• java+ The file name is to run this java file
  

Be careful : function java File and compile java The difference between documents
compile java The file command is javac, Followed by the full name of the file, including the file type , for example
javac HelloWorld.java
function java The file command is java, Followed by the file name , No need to add type , for example ：
java HelloWorld

• Input cd . . Jump to the previous Directory （. Is the current directory ,. . Is the parent directory ）
  

Common command line errors

Compile with the command line java There was an error while loading the file , as follows ：

That's because the coding is different , The default compilation method for most notepads is utf-8,javac The way to compile is GBK, In order to solve this problem, we only need to set a specific coding method at compile time . Here's the picture ：

javac -encoding utf-8 HelloWorld.java

No error will be reported after entering a specific coding method .
The operation results are as follows ：

What's wrong , I hope you will point out that , I will also revise it in time ,
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