Java内部类（Inner Class）详解

;
            //itself data field
            data = 1;
            //its outer class instance field
            Outer.this.data = 1;
        }
    }

    //access privilege level: default
    class Inner2 {
        //can not define static filed, method, class in member class
        //static int j = 1;

        //but, "static final" compound is allowed
        static final int CONSTANT = 1;
    }

    //access privilege level: private
    private class Inner3 {
        public class Inner4 {

        }
    }

    //in fact, Inner5 is not a member class but a static member class
    interface Inner5 {
    }

    private static void staticMethod() {
        //can not create a member class instance directly in outer class' static method
        //Inner1 inner1 = new Inner1();
    }

    private void instanceMethod() {
        //can create a member class instance in outer class' instance method
        Inner1 inner1 = new Inner1();
    }
}

class Test {
    public Test() {
        //cannot create member class instance directly in class other than outer class
        //Outer.Inner2 inner2 = new Outer.Inner2();

        //create a member class instance outside it's outer class
        Outer outer = new Outer();
        Oute

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