Java: keywords combination Summary

Hi guys,

Following is a summary about the combination of Java keywords.

Hope it will be useful for all Java guys.

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Xianyi. Ye

Java keywords combination Summary

	Private	Protected	Public	Abstract	Static	Final	Synchronized	Native
General Class Declaration	Same as the declaration of interface and abstract class	√	√	Only inner class cocould be declared as static	√	Synchronized and native only cocould be used for method declaration
General Class Member variables	√	√	√	√	√	√	Synchronized and native only cocould be used for method declaration
General Class Member Method	√	√	√	√	√	√	√	√
Interface Declaration	Same as general class declaration, interface only cocould be declared as public and abstract	√	√	Since the purpose of declaring interface is to make derived class inherit, so it is not allowed to set interface as final.
Interface Member variables		√ (D)		√ (D)	√ (D)	Default type of interface variable is public, static and final.
Interface Method		√ (D)	√ (D)	Default type of interface method is public and abstract.
Abstract class Declaration	Same as general class declaration, abstract class only cocould be declared as public and abstract	√	√	Since the purpose of declaring abstract class is to make derived class inherit, so it is not allowed to set abstract class as final.
Abstract class Member variables	√	√	√		√	√	Synchronized and native only cocould be used for method declaration
Abstract class Method	√	√	√	√	√	√	√	√
Inner class Declaration	√	√	√	√	√	√	Synchronized and native only cocould be used for method declaration
Inner class Member variables	√	√	√		√ (If class is static)	√	Synchronized and native only cocould be used for method declaration
Inner class Method	√	√	√	√	√ (If class is static)	√	√	√
Anonymous inner class Member variables	√	√	√	Since the Declaration and definition of anonymous inner class is bound together, so we cannot set the keyword static on both Declaration and Member variables	√	Synchronized and native only cocould be used for method declaration
Anonymous inner class Method	√	√	√	Since the Declaration and definition of anonymous inner class is bound together, so we cannot declare method as abstract as well as static.	√	√	√