Question

Java对象不是抽象的,并且未覆盖类中的抽象方法，怎么回事？

public interface PetWatcher { public String feedPet(); public String playsWithPet();}abstract class Person { private String name;}class Worker extends Person implements PetWatcher { private String name; Worker(String name) { this.name = name; } public String feedPet() { return "meat"; } public String playWithPet() { return "ball"; }}class Farmer extends Person implements PetWatcher { private String name; Farmer(String name) { this.name = name; } public String feedPet() { return "rice"; } public String playWithPet() { return "run with it"; }}class Cadre extends Person implements PetWatcher { private String name; Cadre(String name) { this.name = name; } public String feedPet() { return "cans"; } public String playWithPet() { return "let it swim"; }}

Answer 1

hello你已声明为要实现KeyListener和ActionListener接口。那么你这必须要实现KeyListener接口的keyPressed、keyReleased、keyTyped方法和ActionListener接口的actionPerformed方法。而在你的hello类的实现中，仅完成了keyRelease方法，没有达到KeyListener和ActionListener接口的要求。就会出现这个提示。

追问

我靠，你不要这样直接把别人的答案复制过来吧