JAVA靜態和非靜態內部類?

一直對java的靜態和非靜態內部類的東東理解不清楚，今天測試了一下，下面把測試結果記錄一下，加深印象。用于以后查找。?
直接上代碼。?
Java代碼?

package?com.test.xml;??

??

/**?

?*?@author?<a?href="mailto:dq201@126.com">du.qiang</a>?

?*?@version?$Revision?1.1?$?2010-6-23?上午06:48:28?

?*/??

public?class?OutClassTest?{??

????static?int?a;??

??

????int?b;??

??

????public?static?void?test()?{??

????????System.out.println("outer?class?static?function");??

????}??

??

????public?static?void?main(String[]?args)?{??

????????OutClassTest?oc?=?new?OutClassTest();??

????????//?new一個外部類??

????????OutClassTest?oc1?=?new?OutClassTest();??

????????//?通過外部類的對象new一個非靜態的內部類??

????????OutClassTest.InnerClass?no_static_inner?=?oc1.new?InnerClass();??

????????//?調用非靜態內部類的方法??

????????System.out.println(no_static_inner.getKey());??

??

????????//?調用靜態內部類的靜態變量??

????????System.out.println(OutClassTest.InnerStaticClass.static_value);??

????????//?不依賴于外部類實例,直接實例化內部靜態類??

????????OutClassTest.InnerStaticClass?inner?=?new?OutClassTest.InnerStaticClass();??

????????//?調用靜態內部類的非靜態方法??

????????System.out.println(inner.getValue());??

????????//?調用內部靜態類的靜態方法??

????????System.out.println(OutClassTest.InnerStaticClass.getMessage());??

????}??

??

????private?class?InnerClass?{??

????????//?只有在靜態內部類中才能夠聲明或定義靜態成員??

????????//?private?static?String?tt?=?"0";??

????????private?int?flag?=?0;??

??

????????public?InnerClass()?{??

????????????//?三.非靜態內部類的非靜態成員可以訪問外部類的非靜態變量和靜態變量??

????????????System.out.println("InnerClass?create?a:"?+?a);??

????????????System.out.println("InnerClass?create?b:"?+?b);??

????????????System.out.println("InnerClass?create?flag:"?+?flag);??

????????????//??

????????????System.out.println("InnerClass?call?outer?static?function");??

????????????//?調用外部類的靜態方法??

????????????test();??

????????}??

??

????????public??String?getKey()?{??

????????????return?"no-static-inner";??

????????}??

????}??

??

????private?static?class?InnerStaticClass?{??

????????//?靜態內部類可以有靜態成員，而非靜態內部類則不能有靜態成員。??

????????private?static?String?static_value?=?"0";??

??

????????private?int?flag?=?0;??

??

????????public?InnerStaticClass()?{??

????????????System.out.println("InnerClass?create?a:"?+?a);??

????????????//?靜態內部類不能夠訪問外部類的非靜態成員??

????????????//?System.out.println("InnerClass?create?b:"?+?b);??

????????????System.out.println("InnerStaticClass?flag?is?"?+?flag);??

????????????System.out.println("InnerStaticClass?tt?is?"?+?static_value);??

????????}??

??

????????public?int?getValue()?{??

????????????//?靜態內部類訪問外部類的靜態方法??

????????????test();??

????????????return?1;??

????????}??

??

????????public?static?String?getMessage()?{??

????????????return?"static-inner";??

????????}??

????}??

??

????public?OutClassTest()?{??

????????//?new一個非靜態的內部類??

????????InnerClass?ic?=?new?InnerClass();??

????????System.out.println("OuterClass?create");??

????}??

??

}??

Java代碼?

/**?

?*?總結：??

?*?1.靜態內部類可以有靜態成員(方法，屬性)，而非靜態內部類則不能有靜態成員(方法，屬性)。?

?*?2.靜態內部類只能夠訪問外部類的靜態成員,而非靜態內部類則可以訪問外部類的所有成員(方法，屬性)。?

?*?3.實例化一個非靜態的內部類的方法：?

?*??a.先生成一個外部類對象實例?

?*??OutClassTest?oc1?=?new?OutClassTest();?

?*??b.通過外部類的對象實例生成內部類對象?

?*??OutClassTest.InnerClass?no_static_inner?=?oc1.new?InnerClass();?

?*??4.實例化一個靜態內部類的方法：?

?*??a.不依賴于外部類的實例,直接實例化內部類對象?

?*??OutClassTest.InnerStaticClass?inner?=?new?OutClassTest.InnerStaticClass();?

?*??b.調用內部靜態類的方法或靜態變量,通過類名直接調用?

?*??OutClassTest.InnerStaticClass.static_value?

?*??OutClassTest.InnerStaticClass.getMessage()?

?*/??

? 原文地址：

http://duqiangcise.iteye.com/blog/697476

轉載于:https://www.cnblogs.com/scud001/p/3307380.html

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