Interface (Java): Difference between revisions

Revision as of 09:39, 28 June 2017

Revision as of 08:56, 14 September 2017

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<source lang="Java">

interface Bounceable {

double pi=3.1415;

void setBounce(); // Note the semicolon

// Interface methods are public, abstract and never final.

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}

</source>

An interface:

declares only method headers and public constants.

cannot be instantiated.

can be implemented by a class.

cannot extend a class.

can extend several other interfaces.

==Usage==