java4android (被客户不断变化的需求“折磨”)

父类：

class Printer{

    void open(){

        System.out.print("Open");

    }

void close(){

        System.out.print("close");

    }
void print(String print){

        System.out.print("print-->"+print);

    }

}

子类：

class HPPrinter extends Printer{

}

class CanonPrinter extends Printer{

void close(){

        this.clean();

        super.close();

    }
void clean(){

        System.out.print("clean");

    }

}

主函数：

class Test{

    public static void main(String args[]){

        int flag = 0;

if(flag == 0){

            HPPrinter hpPrinter = new HPPrinter();

            hpPrinter.open();

            hpPrinter.print("bvc");

            hpPrinter.close();

        }

        else if(flag == 1){

            CanonPrinter canonPriter = new CanonPrinter();

            canonPriter.open();

            canonPriter.print("bvc");

            canonPriter.close();
}

    }

}

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