java4android (被客户不断变化的需求“折磨”)

class Printer{
void open(){
System.out.print("Open");
}

void close(){
System.out.print("close");
}

void print(String print){
System.out.print("print-->"+print);
}
}

class HPPrinter extends Printer{

}

class CanonPrinter extends Printer{

void close(){
this.clean();
super.close();
}

void clean(){
System.out.print("clean");
}
}

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();

}
}
}