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public class Main{
    public static void main(String args[]){
        Outer outer = new Outer();
        //外部類外部創(chuàng)建內(nèi)部類
        Outer.Inner inner = outer.new Inner();
        inner.method();
    }
}
class Outer{
    private String value = "OuterValue";
    class Inner{
        public void method(){
            //持有父類引用,可以訪問父類private變量value
            System.out.println(value);
        }
        //利用.this關(guān)鍵字,可以返回父類對象引用
        public Outer outerObject(){
            return Outer.this;
        }
    }
}

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? ??? ??? ?? ? ????. ?? ???? ?? ???? ?? ??? ???? ? ????.

??? 1.8 ???? ????? final? ??? ??? ????.

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??? ?? ??? ???? ?? ????? ??? ? ????.

public class Main{
    public static void main(String args[]){
        Outer outer = new Outer();
        outer.outerMethod("param");
    }
}
class Outer{
    public void outerMethod(String value){
        class Inner {
            public void innerMethod(){
                //可以訪問方法參數(shù)
                //1.8以后，內(nèi)部類訪問的方法參數(shù)不必設(shè)置為final
                System.out.println(value);
            }
        }
        new Inner().innerMethod();
    }
}

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public class Main{
    public static void main(String args[]){
        Thread a = new Thread(new Runnable(){
            @Override
            public void run(){
                System.out.println("thread a is running;");
            }
        });
        a.start();
    }
}

? ??? Runnable ?????? ???? ?? ??? ??? ????? ????, ?? ?? ??? ??? ? ?? ??? ?? ?????

public class Main{
    public static void main(String args[]){
        Thread a = new Thread(new RunnableImp());
        a.start();
    }
    static class RunnableImp implements Runnable{
        @Override
        public void run(){
            System.out.println("thread a is running;");
        }
    }
}

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?? ?? ??? ??? ????? ?? ???? ??? ???? ????(?? ?? ???? ??)

??? ?? ???? ??? ? ???? ?? ?? ???? ??? ??? ?? ?? ??

public class Main{
    Outer.Inner inner = new Outer.Inner();
}

class Outer{
    private String ordValue;
    private static String staValue;
    static class Inner{
        {
            System.out.println(staValue);

            //這句編譯通不過
            //System.out.println(ordValue);
        }
    }
}

?? ??? ???? ??: java video

? ??? Java ?? ???? ?? ??? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!