#纠错#纠正其中的错误代码

Question

public class Main {
    public static void main(String[] args){
        IMsg[]msgs=new IMsg[3];
        msgs[0]=new VoiceMsg();
        msgs[1]=new MoneyMsg(300);
        msgs[2]=new TextMsg("我给你说哈....");
        People p=new People();
        p.read(msgs);
    }
}
interface IMsg{
    public void beReadable();
}
class TextMsg implements IMsg {
    String text;

    public TextMsg(String text) {
        this.text = text;
    }

    @Override
    public String toString() {
        return "TextMsg:" + text;
    }

    class VoiceMsg implements IMsg {
        @Override
        public void beReadable() {
            sound();
        }

        public void sound() {
            System.out.println("播放语音信息");
        }
    }

    class MoneyMsg implements IMsg {
        double money;

        public MoneyMsg(double money) {
            this.money = money;
        }

        @Override
        public String toString() {
            return "MoneyMsg:" + money;
        }
    }

    class People {
        public void read(IMsg[] msgs) {
            //处理每一条消息
            for (int i = 0; i < msgs.length; i++) {
                msgs[i].beReadable();
            }
        }
    }
}

这段代码如何优化，纠正其中的错误

Answer 1

• 类的定义不要放到 另一个类里面，它们应该都是同级，又不是内部类
• 接口的抽象方法，实现类要实现
• 参考如下：

public class Main {
    public static void main(String[] args){
        IMsg[]msgs=new IMsg[3];
        msgs[0]=new VoiceMsg();
        msgs[1]=new MoneyMsg(300);
        msgs[2]=new TextMsg("我给你说哈....");
        People p=new People();
        p.read(msgs);
    }
}
interface IMsg{
    void beReadable();
}
class TextMsg implements IMsg {
    String text;

    public TextMsg(String text) {
        this.text = text;
    }

    @Override
    public String toString() {
        return "TextMsg:" + text;
    }

    @Override
    public void beReadable() {
        System.out.println(toString());
    }
}

class VoiceMsg implements IMsg {
    @Override
    public void beReadable() {
        sound();
    }

    public void sound() {
        System.out.println("播放语音信息");
    }
}

class MoneyMsg implements IMsg {
    double money;

    public MoneyMsg(double money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "MoneyMsg:" + money;
    }

    @Override
    public void beReadable() {
        System.out.println(toString());
    }
}

class People {
    public void read(IMsg[] msgs) {
        //处理每一条消息
        for (int i = 0; i < msgs.length; i++) {
            msgs[i].beReadable();
        }
    }
}