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How to properly override clone method?
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Do you absolutely have to use clone? Most people agree that Java's clone is broken.
Josh Bloch on Design - Copy Constructor versus Cloning
If you've read the item about cloning in my book, especially if you read between the lines, you will know that I think clone is deeply broken...
Are there best practices for (Java) package organization? [closed]
... I saw a question answered here regarding the fine-grained organization of java packages. For example, my.project.util , my.project.factory , my.project.service , etc.
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How to get UTF-8 working in Java webapps?
I need to get UTF-8 working in my Java webapp (servlets + JSP, no framework used) to support äöå etc. for regular Finnish text and Cyrillic alphabets like ЦжФ for special cases.
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Why does writeObject throw java.io.NotSerializableException and how do I fix it?
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java.io.NotSerializableException can occur when you serialize an inner class instance because:
serializing such an inner class instance will result in serialization
of its associated outer class instance as well
Serializatio...
Command line progress bar in Java
I have a Java program running in command line mode.
I would like to display a progress bar, showing the percentage of job done.
The same kind of progress bar you would see using wget under unix.
Is this possible?
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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
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Most ORM tools give you several ways to prevent N+1 selects.
Reference: Java Persistence with Hibernate, chapter 13.
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What does JVM flag CMSClassUnloadingEnabled actually do?
I cannot for the life of me find a definition of what the Java VM flag CMSClassUnloadingEnabled actually does, other than some very fuzzy high-level definitions such as "gets rid of your PermGen problems" ( which it doesn't , btw).
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When to use Comparable and Comparator
...clear how a comparable would sort, or do you have to resort to reading the javadoc? If it is the latter, odds are every future sorting use case would require a comparator, at which point the implementation of comparable may slow down users of the class, not speed them up.
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Jackson and generic type reference
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This is a well-known problem with Java type erasure: T is just a type variable, and you must indicate actual class, usually as Class argument. Without such information, best that can be done is to use bounds; and plain T is roughly same as 'T extends Object'....
When to use StringBuilder in Java [duplicate]
... generally preferable to use a StringBuilder for string concatenation in Java. Is this always the case?
9 Answers
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