Therefore, if anyone asks you the interview question, why a lambda expression can access only final and effectively final local variables, you will know the answer. Because the Java Language Specification says so. Everything else is speculation. You an find the code for this article along with...
For example, the completion of a thread’s execution might depend on other threads having completed their execution. The usual well-known example is that of the producer/consumer, because the producer should wait for the consumer if the consumer’s queue is full, and the consumer should wait ...
This resource offers a total of 160 Java Conditional Statement problems for practice. It includes 32 main exercises, each accompanied by solutions, detailed explanations, and four related problems. [AnEditoris available at the bottom of the page to write and execute the scripts.] 1. Check Positi...
This time, it stored in 8th block and 14th block(why? simple answer because of hashCode of Employee objects), to confirm this, lets override hashCode() of Employee to constant value and check the map. If our analysis correct it has to storeall the key’s in the same block. Update Empl...
This code looks pretty reasonable. However, many computers (for example, the Raspberry Pi) don't actually ship with a sound card. So what is the result ofgetSoundcard()? A common (bad) practice is to return the null reference to indicate the absence of a sound card. Unfortunately, this...
Java内存模型(Java Memory Model)是JAVA面试中一个常见知识点,深入理解JMM的面试者往往能够让考官眼前一亮,进而留下深刻的印象。本文转载翻译自JAVA并发大牛布莱恩(Brian Goetz) 的博客[1]《Java theory and practice: Fixing the Java Memory Model, Part 2》,以帮助读者对Java内存模型(JMM)有深入的理解和思考。
If no provider is specified, getInstance searches the registered providers for an implementation of the requested cryptographic service associated with the named algorithm. In any given Java Virtual Machine (JVM), providers are installed in a given preference order, the order in which the provider li...
if (condition-x) commit transaction else if (condition-y) update table-b commit transaction else rollback transaction begin transaction update table-c commit transactionWhen coding an application-managed transaction for session or message-driven beans, you must decide whether to use Java Database ...
/ Composition- PLEASE Document- Basic Usage(built-in utils in JDK)- Synchronized Collections- `synchronized`: Vector / HashTable- be aware of `ConcurrentModificationException`- Concurrent Collections- ConcurrenHashMap / CopyOnWriteArrayList(`Arrays.copyOf` when write) / Blocking Queue(for Producer /...
Problems can arise in defining responsibilities for clean-up: if object A and object B share pointer C, should A delete C, or should B? This eliminates the problem: neither A nor B should (or could) delete C using either C# or Java. Both A and B use C as long as they need to,...