1、java語言基礎(chǔ)：內(nèi)部類 / 內(nèi)部類 public class innerclass private int i = 0;public int getint()return i;public void proc()innerclass inclass = new innerclass();system.out.println(inclass.getint();public class main public static void main(string args) outterclass outclass = new outterclass();outcc();/ 外部類cl

2、ass outterclass / 內(nèi)部類public class innerclass private int i = 0;public int getint()return i;public void proc()innerclass inclass = new innerclass();system.out.println(inclass.getint();public class main public static void main(string args) outterclass outclass = new outterclass();outcc();外部類可以

3、拜訪內(nèi)部類的私有成員，內(nèi)部類也可以拜訪外部類的私有成員：view plaincopy to clipboardprint?/ 外部類class outterclass private int mout = 10;/ 內(nèi)部類public class innerclass private int min = 0;public void printoutprivate()/ 挺直打印外部類的成員system.out.println(mout);public void printinprivate()innerclass inclass = new innerclass();/ 挺直打印內(nèi)部類的私有成

4、員system.out.println(inclass.min);public void printoutprivate()innerclass inclass = new innerclass();inclass.printoutprivate();public class main public static void main(string args) outterclass outclass = new outterclass();outclass.printinprivate();outclass.printoutprivate();/ 外部類class outterclass pr

5、ivate int mout = 10;/ 內(nèi)部類public class innerclass private int min = 0;public void printoutprivate()/ 挺直打印外部類的成員system.out.println(mout);public void printinprivate()innerclass inclass = new innerclass();/ 挺直打印內(nèi)部類的私有成員system.out.println(inclass.min);public void printoutprivate()innerclass inclass = new

6、 innerclass();inclass.printoutprivate();public class main public static void main(string args) outterclass outclass = new outterclass();outclass.printinprivate();outclass.printoutprivate();假如外部類的成員變量與內(nèi)部類的成員變量名字相同，當內(nèi)部類要拜訪外部類的該成員時，可以用法“outclass.this.mem”來區(qū)別：view plaincopy to clipboardprint?/ 外部類class

7、outterclass private int mmem = 10;/ 內(nèi)部類public class innerclass private int mmem = 0;public void printoutprivate()/ 挺直打印外部類的成員system.out.println(outterclass.this.mmem);/ 外部類class outterclass private int mmem = 10;/ 內(nèi)部類public class innerclass private int mmem = 0;public void printoutprivate()/ 挺直打印外部類

8、的成員system.out.println(outterclass.this.mmem);要創(chuàng)建一般內(nèi)部類，必需先創(chuàng)建相應(yīng)的外部類：view plaincopy to clipboardprint?/ 外部類class outterclass private int mmem = 10;/ 內(nèi)部類public class innerclass private int mmem = 0;public void printoutprivate()/ 挺直打印外部類的成員system.out.println(outterclass.this.mmem);public class main publi

9、c static void main(string args) outterclass outclass = new outterclass();outterclass.innerclass inclass = outclass.new innerclass();inclass.printoutprivate();/ 外部類class outterclass private int mmem = 10;/ 內(nèi)部類public class innerclass private int mmem = 0;public void printoutprivate()/ 挺直打印外部類的成員system

10、.out.println(outterclass.this.mmem);public class main public static void main(string args) outterclass outclass = new outterclass();outterclass.innerclass inclass = outclass.new innerclass();inclass.printoutprivate();也可以用下面的方式：view plaincopy to clipboardprint?/ 外部類class outterclass private int mmem

11、= 10;/ 內(nèi)部類public class innerclass private int mmem = 0;public void printoutprivate()/ 挺直打印外部類的成員system.out.println(outterclass.this.mmem);public innerclass newinnerclass() return new innerclass();public class main public static void main(string args) outterclass outclass = new outterclass();outtercl

12、ass.innerclass inclass = outclass.newinnerclass();inclass.printoutprivate();/ 外部類class outterclass private int mmem = 10;/ 內(nèi)部類public class innerclass private int mmem = 0;public void printoutprivate()/ 挺直打印外部類的成員system.out.println(outterclass.this.mmem);public innerclass newinnerclass() return new i

13、nnerclass();public class main public static void main(string args) outterclass outclass = new outterclass();outterclass.innerclass inclass = outclass.newinnerclass();inclass.printoutprivate();2. 靜態(tài)內(nèi)部類一般內(nèi)部類前面加上static修飾符，就成為靜態(tài)內(nèi)部類，靜態(tài)內(nèi)部類類似于c+的嵌套類，與一般內(nèi)部類相比有如下區(qū)分：靜態(tài)內(nèi)部類沒有指向外部類的引用，外部類對于它來說更像一個名字空間。一般內(nèi)部類不能有靜態(tài)

14、成員，靜態(tài)辦法，或另一個靜態(tài)內(nèi)部類；而靜態(tài)內(nèi)部類可以有這一切。靜態(tài)內(nèi)部類可以挺直創(chuàng)建，不必先創(chuàng)建外部類：view plaincopy to clipboardprint?/ 外部類class outterclass private int mmem = 0;/ 靜態(tài)內(nèi)部類static public class innerclass private int mmem = 0;public void printoutprivate()/ 這是錯誤的/ system.out.println(outterclass.this.mmem);public void printinprivate() inn

15、erclass inclass = new innerclass();/ 可以挺直拜訪靜態(tài)內(nèi)部類的成員system.out.println(inclass.mmem);public class main public static void main(string args) / 挺直創(chuàng)建靜態(tài)內(nèi)部類outterclass.innerclass inclass = new outterclass.innerclass();inclass.printoutprivate();/ 外部類class outterclass private int mmem = 0;/ 靜態(tài)內(nèi)部類static publ

16、ic class innerclass private int mmem = 0;public void printoutprivate()/ 這是錯誤的/ system.out.println(outterclass.this.mmem);public void printinprivate() innerclass inclass = new innerclass();/ 可以挺直拜訪靜態(tài)內(nèi)部類的成員system.out.println(inclass.mmem);public class main public static void main(string args) / 挺直創(chuàng)建靜態(tài)

17、內(nèi)部類outterclass.innerclass inclass = new outterclass.innerclass();inclass.printoutprivate();從上面描述可以看出，靜態(tài)內(nèi)部類與普通類沒有太大區(qū)分，只不過它是放在一個類的里面，這個類相當于它的名字空間，可以防止命名矛盾。3. 局部內(nèi)部類java可以把一個類定義在一個辦法里面，甚至是一個塊里面，它的作用域就在這個塊里面：view plaincopy to clipboardprint?/ 外部類class outterclass public void testlocalinner() if (true)cla

18、ss localinner public void proc() system.out.println("hello");/ 可以創(chuàng)建用法localinner localinner = new localinner();localic();/ 錯誤：超出類定義的作用域localinner localinner = new localinner();localic();/ 外部類class outterclass public void testlocalinner() if (true)class localinner public void

19、 proc() system.out.println("hello");/ 可以創(chuàng)建用法localinner localinner = new localinner();localic();/ 錯誤：超出類定義的作用域localinner localinner = new localinner();localic();局部內(nèi)部類的普通用途是實現(xiàn)某個接口，并作為這個接口傳出辦法被用法：view plaincopy to clipboardprint?/ 接口interface talker public void talk();/ 外部類cla

20、ss outterclass public talker gettalker() / 現(xiàn)實該接口的局部內(nèi)部類class sometalker implements talker public void talk() system.out.println("hello");/ 創(chuàng)建類實例并作為talker返回sometalker talker = new sometalker();return talker;public class main public static void main(string args) outterclass outclass = new out

21、terclass();talker talker = outclass.gettalker();talker.talk();/ 接口interface talker public void talk();/ 外部類class outterclass public talker gettalker() / 現(xiàn)實該接口的局部內(nèi)部類class sometalker implements talker public void talk() system.out.println("hello");/ 創(chuàng)建類實例并作為talker返回sometalker talker = new sometalker();return talker;public class main public static void main(string