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 could be declared as static	√	Synchronized and native only could be used for method declaration
General Class Member Variables	√	√	√	√	√	√	Synchronized and native only could be used for method declaration
General Class Member Method	√	√	√	√	√	√	√	√
Interface Declaration	Same as General class declaration, interface only could be declared as public and abstract	√	√	Since the purpose of declaring interface is to make derived class inherit it, 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 could be declared as public and abstract	√	√	Since the purpose of declaring abstract class is to make derived class inherit it, so it is not allowed to set abstract class as final.
Abstract Class Member Variables	√	√	√		√	√	Synchronized and native only could be used for method declaration
Abstract Class Method	√	√	√	√	√	√	√	√
Inner Class Declaration	√	√	√	√	√	√	Synchronized and native only could be used for method declaration
Inner Class Member Variables	√	√	√		√ (If class is static )	√	Synchronized and native only could 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 could 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.	√	√	√