码
我有一个成员接口的类：
package com.example.withinterface;
public class SomeClass {
interface SomeInterface {
void doSomething();
}
}
另一个试图访问它的课程：
package com.example.withinterface.main;
import com.example.withinterface.SomeClass;
public class Main {
public static void main(String[] argss) {
System.out.println(SomeClass.SomeInterface.class);
}
}
在Main中我从javac中得到以下错误：SomeClass中SomeInterface不是public;不能从外部包装访问.
在Eclipse中：SomeInterface在SomeClass中不是public;不能从外部包装访问.
两者都编译为Java 7.如果我将SomeInterface公开,那么所有的编译都很好.
但规格说
Java Language Specification for Java 7说：
A member interface is an interface whose declaration is directly
enclosed in another class or interface declaration.A member interface in a class declaration is implicitly public (§6.6)
unless an access modifier is specified.
Java Language Specification for Java 5似乎没有第二句话.
题
那么不应该将SomeInterface视为公开的,不应该主要编译？
更新
如Ajay George所示,这的确是an error in the Java Language Specification 7(感谢JamesB).同时修改了规格,删除了错误的句子. Last version in Archive.org with the incorrect sentence.
解决方法
我猜这个规范是错的.
这是您的代码的javap输出.
这是您的代码的javap输出.
E:\workspace>javap com\example\withinterface\SomeClass
Warning: Binary file com\example\withinterface\SomeClass contains com.example.wi
thinterface.SomeClass
Compiled from "SomeClass.java"
public class com.example.withinterface.SomeClass {
public com.example.withinterface.SomeClass();
}
E:\workspace>javap com\example\withinterface\SomeClass$SomeInterface
Warning: Binary file com\example\withinterface\SomeClass$SomeInterface contains
com.example.withinterface.SomeClass$SomeInterface
Compiled from "SomeClass.java"
interface com.example.withinterface.SomeClass$SomeInterface {
public abstract void doSomething();
}
我将界面更改为public,然后重新编译.
E:\workspace>javap com\example\withinterface\SomeClass
Warning: Binary file com\example\withinterface\SomeClass contains com.example.wi
thinterface.SomeClass
Compiled from "SomeClass.java"
public class com.example.withinterface.SomeClass {
public com.example.withinterface.SomeClass();
}
E:\workspace>javap com\example\withinterface\SomeClass$SomeInterface
Warning: Binary file com\example\withinterface\SomeClass$SomeInterface contains
com.example.withinterface.SomeClass$SomeInterface
Compiled from "SomeClass.java"
public interface com.example.withinterface.SomeClass$SomeInterface {
public abstract void doSomething();
}
注意内在类的差异.
