Anonymous classes properties

A program system manages a long process. To start the process you should invoke the static method startLongProcess that takes a callback. Here is the declaration of this method:

public static void startLongProcess(Callback callback)

The Callback interface has three methods:

interface Callback {
    
    void onStarted();
    
    void onStopped(String cause);
    
    void onFinished(int code);
}

You should create an anonymous class that implements the Callback interface and pass the instance to the method startLongProcess as an argument. The method will call the passed callbacks at different stages of the process.

The anonymous class must override all methods of the Callback interface (otherwise the code won't be compiled).

• The method onStarted must print the message "The process started" in the standard output.
• The method onStopped takes a cause and prints it to the standard output.
• The method onFinished takes a code of the process completion. It should print "The process successfully finished" if the process is finished with the code 0, otherwise, the method should print the text "The process is finished with error: " plus the given code (for example, "The process is finished with error: 43").

All strings must be printed without quotes. Each message should be in a new line.

Use the provided code template, do not copy the given class and the method.

If the instance (callback) of your anonymous class is created correctly, after calling the following code:

callback.onStarted();
callback.onFinished(0);

you will get the following output:

The process started
The process successfully finished