接口：打印机接口
interface Printer
{
public void read();
}
函数一：佳能打印机
class CanPrinter implements Printer
{
public void read(){
System.out.println("Canread");
};
}
函数二：惠普打印机
class HPPrinter implements Printer
{
public void read(){
System.out.println("HPread");
};
}
主函数：
class Test
{
public static void main(String args[]){
int flag=0;
Printer p = null;
if(flag==0){
p = new HPPrinter();
}else{
p = new CanPrinter();
}p.read();
}
}
得出：HPread
二次整合
接口、函数一、二不变，增加判断flag的类，方便修改
class PrinterFactory
{
Printer getPrinter(int flag){ //定义类型为Printer
Printer p = null;
if(flag==0){
p = new HPPrinter();
}else if(flag==1){
p = new CanPrinter();
}
return p; //返回对象
}
}
主函数：
class Test
{
public static void main(String args[]){
int flag=0;
PrinterFactory f = new PrinterFactory();
Printer printer = f.getPrinter(flag);
printer.read();
}
}
时间： 2024-08-05 02:55:17