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How to access to methods in a private constructor class

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The constructor is private because the writer(s) didn't want you to be able to instantiate it. Instead they used static methods. This means that instead of:

DDSUtil util = new DDSUtil(); // If the constructor were public and didn't use static methods
BufferedImage image =; // Requires a try { } catch { } too

You should actually write:

BufferedImage image =; // But don't forget try and catch

The same applies for all static members - you refer to them by the class name, not an instance of the object.

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Just to add to dr01d3k4's explanation, static members are class members and therefore accessed through the class, non-static members are object (instance) members and are accessed via an object / instance.

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