?Щ????Java??????????

???????????? ???????[ 2013/12/9 10:13:05 ] ????????

11??

???????????Σ?
??class Z extends A implements B??C
????{
????}
????//?????????????????????????

????12???й????????????????????????????????????????????????????????????????????

???????????Σ?
??class Car
????{
????class Wheel
????{
????}
????}
????class PlaneWheel extends Car.Wheel
????{
????public static void main(String[] args)
????{
????PlaneWheel pw = new PlaneWheel();
????}
????}

????????????????????????????????pw???????????Car.Wheel??????????????????????????????????????????????????????????????????????ù????

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

???????????Σ?
????class PlaneWheel extends Car.Wheel
????{
????PlaneWheel(Car car)
????{
????car.super();
????}
????public static void main(String[] args)
????{
????Car car = new Car();
????PlaneWheel pw = new PlaneWheel(car);
????}
????}

????

21??javac A.java????????B.class???????classB??A.java?б????????????????Public???

????22??finally????????????try??catch???????????finally??????????try????return????????????????е???????????finally?У??????????С?

?????????????л?????????????????????finally?е??????У???д

????System.exit(-1);??????????С?//????0?????

????23??c++???????????????????????java?в?????????String??"+"??"+="????java?б?????????????

????24??StringBuffer??????

????StringBuffer sb = new StringBuffer().append("a").append("bc").append("123");

????????toString()??????????????toString();

??????????????????????toString??????????????????????????

????25??java?е????????0????????????????????????????????????С??????????????????????????????????????????

????26??java?У???????????????????????????????????????;??????????????????????????????????????????????????????????????????????檔