Java Interface

interface usb{void read();void write();//接口里面全部都是public,abstruct的方法}interface wifi{void open();void close();}class mobileusb implements usb,wifi{public void read(){System.out.println("usb read");}public void write(){System.out.println("usb write");}public void open(){System.out.println("wifi open");}public void close(){System.out.println("wifi colse");}}class test{public static void main(String args[]){mobileusb mobile=new mobileusb();mobile.read();mobile.write();mobile.open();mobile.close();}}