#Create a test directory
$ mkdir -p ~/java/test

#Move to directory
$ cd ~/java/test

#Create a test file
$ touch test.java

#Edit test file
$ vi test.java

//test.java

class Main {
  public static void main(String[] args) {
    String msg = "";
    msg += "Hello ";
    msg += "World!";
    System.out.println(msg);
  }
}

#Move to the created directory
$ cd ~/java/hello

$ java test.java

Hello World

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