Learn about Java anonymous classes.
Baeldung - In-depth, to-the-point tutorials on Java, Spring, Spring Boot, Security, and REST.
Anonymous Class In Java - Coding Ninjas
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Anonymous classes in Java. …and why you should be cautious to use…, by Friedel Verpoort, Javarevisited
Anonymous Classes in Java
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Anonymous Classes A short-cut for defining classes when you want to create only one object of the class. - ppt download