What does an exclamation mark mean in Java?

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Yes it does mean the logical opposite. It works even with equals operator.

Assuming your method return a basic bool type

// means the Network is NOT connected
if (!NetworkConnected())

This is equivalent to

if (NetworkConnected() != true)

So logically means

if (NetworkConnected() == false)

Now assuming you method return a Boolean (indeed a real object), this means

// means the Network is NOT connected
if (! Boolean.TRUE.equals(NetworkConnected());

or

if (Boolean.FALSE.equals(NetworkConnected());

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