Java on mac lags and does not start, what should I do?

Question

Java

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

I wrote the simplest program, saved the project in .java format via Brackets
But it does not run through all jdk and java programs, and also gives an error through the terminal !!!
Then I opened the settings, on the Java item it says EXPECT THE PANEL
The panel has opened, and this ****** is waiting for me like this:
What to do now - I don’t have to.

Answer 1

What to do now - I don't know.

Take textbook.

$ javac Untitled-1.java
$ java HelloWorld