Hands-On Design Patterns with Java

Printer

The Printer class has a single class variable, printerState. It contains constructor, accessor, and mutator methods. Here is the Printer class source code:

public class Printer {    // class variable    private PrinterController printerState;    // constructor    public Printer(PrinterController pState) {        this.printerState = pState;    }    // accessor / getter    public PrinterController getPrinterState() {        return printerState;    }    // mutator / setter    public void setPrinterState(PrinterController pState) {        this.printerState = pState;    }    public void pushPrint() {        printerState.pushPrint(this);    }}

The Printer class also contains the pushPrint() method, which simulates pushing a printer's power button.