泛型接口实现方式

子类继续用泛型

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interface IMessage<T>{
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    public String echo(T t);
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}
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class MessageImpl<S> implements IMessage <S>{
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    public String echo(S t){
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        return "[echo]" + t;
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    }
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}
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public class Type{
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    public static void main(String args []){
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        IMessage<String> msg = new MessageImpl<String>();
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        System.out.println(msg.echo("我是菜菜"));
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    }
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}

子类直接指定泛型

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interface IMessage<T>{
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    public String echo(T t);
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}
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class MessageImpl implements IMessage <String>{
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    public String echo(String t){
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        return "[echo]" + t;
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    }
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}
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public class Type{
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    public static void main(String args []){
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        IMessage<String> msg = new MessageImpl();
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        System.out.println(msg.echo("我是菜菜"));
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    }
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}