匿名内部类

发布于 2024-10-20 00:10:02 字数 358 浏览 7 评论 0原文

class One {
Two two() {
    return new Two() {
        Two(){}
        Two(String s) {
            System.out.println("s= "+s);
        }
    };
    }
}

class Ajay {
    public static void main(String ...strings ){
        One one=new One();
        System.out.println(one.two());
    }
}

上面的示例代码无法编译。它显示“两个无法解析”。这段代码有什么问题？

原文

class One {
Two two() {
    return new Two() {
        Two(){}
        Two(String s) {
            System.out.println("s= "+s);
        }
    };
    }
}

class Ajay {
    public static void main(String ...strings ){
        One one=new One();
        System.out.println(one.two());
    }
}

The above sample code cannot be compiled.It says "Two cannot be resolved".
What is the problem in this code??

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小傻瓜 2024-10-27 00:10:02

您正在创建

new Two()，因此类路径中必须有一个有效的类。

使其工作

class Two{

}

class One {
Two two() {
    return new Two() {
//        Two(){}
//        Two(String s) {
//            System.out.println("s= "+s);
//        }//you can't override constuctors
    };
    }
}

或在 new 的左侧必须有超类或接口才能使其工作

you are creating

new Two() so there must be a valid class in classpath.

make it

class Two{

}

class One {
Two two() {
    return new Two() {
//        Two(){}
//        Two(String s) {
//            System.out.println("s= "+s);
//        }//you can't override constuctors
    };
    }
}

or on left side of new there must be super class or interface to make it working

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苍暮颜 2024-10-27 00:10:02

new Two() {
    Two(){}
    Two(String s) {
        System.out.println("s= "+s);
    }
};

匿名内部类之所以称为匿名，是因为它没有自己的名称，必须通过它扩展/实现的基类或接口的名称来引用。

在您的示例中，您创建了 Two 的匿名子类，因此必须将 Two 声明为类或接口。如果类 Two 已声明，则您的类路径中没有它，或者忘记导入它。

new Two() {
    Two(){}
    Two(String s) {
        System.out.println("s= "+s);
    }
};

An anonymous inner class is called anonymous because it doesn't have its own name and has to be referred to by the name of the base-class or interface it extends/implements.

In your example you create an anonymous subclass of Two so Two has to be declared somewhere either as a class or interface. If the class Two is already declared you either don't have it on your classpath or forgot to import it.

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