Patterns In The Java Sdk

Please describe examples of specific patterns as they appear (correctly or not) in the Java class libraries.

• JavaAwtToolkit
• JavaLangRuntime
• JavaIo
• ...

While not JavaPatterns, JavaIdioms may provide useful insight.

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I was looking for java.util.Iterator is an example of Iterator, except they screwed up...

In what way did they screw up?

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CategoryPattern