内部私人阶级和公共方法

Question

If I have something like this:

public class Outer {

    private class Inner {
        public void someMethod() {}
    }

    Inner in = new Inner();
    in.someMethod(); //What??
}

Why doesn't last line code work?

Answer 1

Why doesn't last line code work?

Because it has to be wrapped within a block ( initializer , constructor , method ).

For example (wrapper within a constructor):

public class Outer {

    private class Inner {
        public void someMethod() {}
    }

    public Outer() {
        Inner in = new Inner();
        in.someMethod();
    }

}

Answer 2

You just cant invoke any method directly from class body. It has to be a method or constructor or initilizer block