小编Rob*_*iot的帖子

我有以下结构:

public interface BarReturn {}
public interface FooReturn {}
public interface FooBarReturn extends FooReturn, BarReturn {}

public interface Foo {  
  FooReturn fooBar( );
}

public interface Bar {
  BarReturn fooBar();
}

public interface FooBar extends Foo, Bar {
  FooBarReturn fooBar();
}

Javac失败并显示以下消息:

FooBar.java:2: types Bar and Foo are incompatible; both define fooBar(), but with unrelated return types
public interface FooBar extends Foo, Bar {
       ^
1 error

但是,Eclipse可以很好地编译它,并且据我所知它应该编译--FooBar的fooBar()方法通过使用协变返回来满足Foo和Bar的fooBar()方法的约定.

这是Eclipse编译或javac中的错误吗？或者有没有办法说服javac编译它？作为参考,我的javac选项如下所示:

javac -d /tmp/covariant/target/classes -sourcepath /tmp/covariant/src/main/java: /tmp/covariant/src/main/java/Foo.java /tmp/covariant/src/main/java/BarReturn.java /tmp/covariant/src/main/java/FooBarReturn.java /tmp/covariant/src/main/java/Bar.java /tmp/covariant/src/main/java/FooReturn.java /tmp/covariant/src/main/java/FooBar.java …