Adapter Pattern -- Structural Pattern

Adapter mode (applicable scenarios, the transformation of the old system, and some codes cannot be modified, and compatibility processing is required)

 

original usb interface

public interface Usb {

    void input();

}

 

The original calling method

public  class Customer {

    public void input(Usb usb){
        usb.input();
    }

}

 

the method you want to call now

public class Ps2 {

    public void ps2Input(){
        System.out.println("ps2输入");
    }

}

 

Transition class created in the middle

public class SwUsb2Ps2  implements Usb{
    private static Ps2 ps2 = new Ps2();

    @Override
    public void input() {
        ps2.ps2Input();
    }
}