[英]What's wrong with my factory?
I've got some code like this: 我有一些像这样的代码:
public abstract class Foo {
public static Foo getFoo() {
return new FooImpl();
}
abstract void DoFoo();
private class FooImpl extends Foo {
public FooImpl() { }
@Override
void DoFoo() { }
}
}
But Eclipse is telling me No enclosing instance of type Foo is accessible.
但Eclipse告诉我No enclosing instance of type Foo is accessible.
So how can I get this to work? 那我怎么能让它运作起来呢?
I attempted to make it as simple as possible to see if it would compile: 我试图让它尽可能简单,看它是否会编译:
public abstract class Foo {
public static Foo getFoo() {
return new FooImpl();
}
private static class FooImpl extends Foo {
public FooImpl() { }
}
}
And I still get the same error. 我仍然得到同样的错误。 What am I missing? 我错过了什么?
FIXED! 固定! I changed the line return new FooImpl();
我更改了行return new FooImpl();
to return new Foo.FooImpl();
return new Foo.FooImpl();
Excellent explanation here -- in brief, you need to make class FooImpl
static
, so it's only tied to the outer class, not to a specific instance of the outer class (which you don't have). 这里有 FooImpl
解释 - 简而言之,你需要使类FooImpl
static
,所以它只与外部类相关联,而不是外部类的特定实例 (你没有)。 The getFoo
method also looks like it should be static, btw -- otherwise, what instance of Foo
were you planning on calling it on? 该getFoo
方法也看起来应该是静态的,顺便说一句-否则,什么情况下的Foo
是你在调用它的规划?
How do you intend people to call getFoo()
? 你打算怎么打电话给getFoo()
?
Unless you're doing something completely funky and radical, you'll need to make it static
. 除非你做的事情完全是时髦和激进的,否则你需要让它变得static
。
使FooImpl
类static
,它将工作。
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