What does <Object> in Map<Object> mean?

I'm new to java and I don't know what this code is

Map<Object>

What do they call these on java?

Can you tell me what does the code means? Is this casting? Can you direct me to an article leading to more examples and explan开发者_开发百科ation of the said code?

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It's a declaration of a generic type. See this doc for more info.