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        pinner p = new pinner();
        p.index = 20;
        p.Print();
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        pouter po = new pouter();
        pinner pi = po.new pinner();
        pi.index = 40;
        pi.Print();
        ---- ÕâÖÖ·½Ê½ÊʺÏÍⲿÀàµÄstatic·½·¨£»
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            System.out.println("Print in inner Outer.index=" + pouter.this.index);
            System.out.println("Print in inner Inner.index=" + this.index);
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        // ÍⲿÀà
        pinner getInner()
        {
            return new pinner();
        }
        // ÆäËûÀà
        pouter.pinner pi = po.getInner();
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