Printer.java
package com;
public interface Printer {
void printer();
}
SchoolPrinter.java
package com;
public class SchoolPrinter {
public void AddPrinter(Printer p){
p.printer();
}
}
addPrinter.java
package com;
public class addPrinter {
public static void main(String[] args) {
SchoolPrinter sp = new SchoolPrinter();
ZhenPrinter zp = new ZhenPrinter();
ColorPrinter cp=new ColorPrinter();
ThreePrinter tp=new ThreePrinter();
FourPrinter fp=new FourPrinter();
sp.AddPrinter(zp);
sp.AddPrinter(cp);
sp.AddPrinter(tp);
sp.AddPrinter(fp);
}
}
ColorPrinter.java
package com;
public class ColorPrinter implements Printer{
public void printer(){
System.out.println("添加彩色打印机");
}
}
FourPrinter.java
package com;
public class FourPrinter implements Printer{
public void printer(){
System.out.println("添加4D打印机");
}
}
ThreePrinter.java
package com;
public class ThreePrinter implements Printer{
public void printer(){
System.out.println("添加3D打印机");
}
}
ZhenPrinter.java
package com;
public class ZhenPrinter implements Printer{
public void printer() {
System.out.println("添加针孔打印机");
}
}
结果: