Updating maven dependencies sleeping
Yes, two unequal objects can have same hashcode that's why collision happen in a hashmap. It's one of the many ways to achieve thread-safety.
Runtime class to get the free memory, total memory and maximum heap memory in Java. Rule of thumb is to use constructor injection for mandatory dependency and use setter injection for optional dependency.
If your client is using some interface but you have something else, you can write an Adapter to bridge them together. Coming back to the answer of this question, Though both are build tool and used to create Java application build, Maven is much more than that. Any modification will result in a new object e.
Since a Map needs key and value, a default value is used for all keys. The answer is simple, a public top level class must have the same name as the name of the source file, there is no such requirement for nested static class. See the answer for more differences between HashMap and Hashtable in Java. Entry is a nested static class, where HashMap is a top level class and Entry is nested static class. Basically, Java Memory model inserts a write barrier after you write to a volatile variable and a read barrier before you read it.
Like many concurrency issues, the primary way to avoid false sharing is careful code review and aligning your data structure with the size of a cache line. See the link for the more detailed answer.
Externalizable allows you to fully control the Serialization process, specify a custom binary format and add more security measure. If an object A is composed of object B then B doesn't exist if A ceased to exists, but if object A is just an aggregation of object B then B can exists even if A ceased to exist.
If you implement Collection then you by default get that property. If you know that a long field is accessed by more than one thread e.
One of the practical use of the volatile variable is to make reading double and long atomic. This another good question I love to ask on volatile, mostly as a follow-up of the previous question.
It's only beneficial if you need to wait for a very small amount of time e. If you don't do that, you will get an incorrect result while parsing or formatting dates in Java.
They provide better scalability. It's mandatory to declare any unhandled checked exception in throws clause in Java. You can use memory related methods from java. It provides interface conversion.
You can generally say about dependency injection, factory pattern, decorator pattern or observer pattern, whichever you have used. Using Java enum as Singleton class is one of the easiest ways to create a thread-safe singleton in Java. Though be prepared to answer follow-up question based upon the pattern you choose.
This happens when you have multiple, overloaded constructor in the class. Inheritance is necessary for overriding. Constructor injection guaranteed that class will be initialized with all its dependency, but setter injection provides flexibility to set an optional dependency.
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