The "new" keyword inside System.out.println example

// The "new" keyword inside System.out.println example with comments, by Ericson Willians.

public class CustomClass {

    private String s; // Declares a private field of String type in CustomClass, accessible only from inside.

    public CustomClass(String s) { // Declares and initializes the constructor, which is void, and takes a String as an argument.
        this.s = s; // Initializes the private String field with the argument given to the constructor.
    }

    public String getString() { // Declares and initializes a public method to return the private String,
        return this.s; // So that the outside world can access it.
    }

}

public class Main {

    public static void main(String[] args) {

        System.out.println(new CustomClass("Hello World!").getString());

        // The "new" keyword returns an instance of the given class, which is initialized with its constructor.
        // As soon as the CustomClass instance has been returned, it was possible to access its "getString()" method.
        // Which returns the String object that I've passed to the constructor, "Hello World!".

    }

}