Java learning notes 1 (HelloWorld), learning notes helloworld

Java learning notes 1 (HelloWorld), learning notes helloworld

Writing HelloWorld is a ceremony:

1. Download and install JDK. Note that no Chinese characters exist in the path.

2. Add environment variables and bin directory

3. Write a text with the following content and the suffix changed to. java. Note that the text name is HelloWorld and cannot be changed.

Public class HelloWorld {
Public static void main (String [] args ){
System. out. println ("HelloWorld ");
}
}

 

4. Compile after writing:

Open cmd To Go To The java file directory, and then: javac HelloWorld. java

A class file is generated, and then: java HelloWorld

Successful!

 

Additional:

Some common doscommands:

1. Open: win + R Enter cmd
2. Return to the upper-level Directory: cd ..
3. Return the root directory: cd \
4. Enter a directory: cd name
5. Switch the drive letter: cd d:
6. Combination: cd d: \ name (remember to change the drive letter)
7. Show All contents in the current directory: dir
8. Clear screen: cls
9. Check ip: ipconfig