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Java first program

Create the project directory.

~
➜ mkdir java-project
~
➜ mkdir java-project

Move into the project directory.

~
➜ cd java-project
~
➜ cd java-project

Create a .java.java file.

~/java-project
➜ touch Program.java
~/java-project
➜ touch Program.java

Open VS Code.

~/java-project
➜ code .
 
~/java-project took 8s
➜
~/java-project
➜ code .
 
~/java-project took 8s
➜

Wright the following code:

public class Program {
 
  public static void main(String[] args) {
    System.out.println("Hello, world!")
  }
  
}
public class Program {
 
  public static void main(String[] args) {
    System.out.println("Hello, world!")
  }
  
}

Compile the code.

~/java-project 
➜ javac Program.java
Program.java:4: error: ';' expected
    System.out.println("Hello, world!")
                                      ^
1 error
~/java-project 
➜ javac Program.java
Program.java:4: error: ';' expected
    System.out.println("Hello, world!")
                                      ^
1 error

Add the semicolon and run again.

~/java-project took 2s 
➜ javac Program.java
~/java-project took 2s 
➜ javac Program.java

Start the Java application.

~/java-project 
➜ java Program      
Hello, world!
~/java-project 
➜ java Program      
Hello, world!