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//=========1111111惠普打印机===================
class hpprinter extends fulei{
}
//===2222222主类===========
class test(){
public static void main(string args[]){
int flag=0;
if(flag==0){
hpprinter hp=new hpprinter();
hpprinter.open();
hpprinter.print();
hpprinter.close();
}
else if(flag==1){
CannonPrinter can=new CannonPrinter();
CannonPrinter.open();
CannonPrinter.print();
CannonPrinter.close();
}
}
//=====33333333 佳能打印机==========
class CannonPrinter extends fulei{
void close(){
this.clean();
super.close();
}
void clean(){
System.out.print(clean);
}
}
//========4444父类=========
class fulei{
void open(){
System.out.println("open");
}
void close(){
System.out.println("close");
}
void print(){
System.out.println("print");
}
}