如何打印接口的連接方法？我只想通過最小化類修改來修改主電源。如果我使用arr[0].連接（）;錯誤：未為設備類型定義連接（）方法public class main{ private static Device arr[]; public static void main(String[] args) { // TODO Auto-generated method stub init(); arr[0].print(); arr[1].print(); } public static void init() { arr = new Device[2]; arr[0] = new Printer(); arr[1] = new UsbMem(); }}public interface Connectable { public static final String name = ":USB"; public abstract void connect();}public abstract class Device { public abstract void print();}public class Printer extends Device implements Connectable { public void print() { System.out.println("It's a printer"); } public void connect() { System.out.println(name + "connect with printer"); }}public class UsbMem extends Device implements Connectable { public void print() { System.out.println("USB memory"); } public void connect() { System.out.println(name + "connect with usb memory"); }}這是一臺打印機。：USB 與打印機連接 USB 存儲器 ：USB 與 USB 存儲器連接
2 回答
慕容森
TA貢獻1853條經驗 獲得超18個贊
Device需要實現 。Connectable
public class Main {
private static Device arr[];
public static void main(String[] args) {
// TODO Auto-generated method stub
init();
arr[0].print();
arr[1].print();
}
public static void init() {
arr = new Device[2];
arr[0] = new Printer();
arr[1] = new UsbMem();
}
}
public interface Connectable {
public static final String name = ":USB";
public abstract void connect();
}
public abstract class Device implements Connectable {
public abstract void print();
}
public class Printer extends Device {
public void print() {
System.out.println("It's a printer");
}
public void connect() {
System.out.println(name + "connect with printer");
}
}
public class UsbMem extends Device {
public void print() {
System.out.println("USB memory");
}
public void connect() {
System.out.println(name + "connect with usb memory");
}
}
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