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Singleton Examples from the Java API

Krokodyl 8 months ago 0
The examples from the Java API for the Singleton design pattern mention:
java.lang.Runtime#getRuntime()
java.awt.Desktop#getDesktop()
java.lang.System#getSecurityManager()

I don't understand the 3rd example.
System has a private constructor but no point of access.
SecurityManager has a public constructor.
Therefore neither are Singletons. Right?