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The role of Serverlet in Java
Servlet serves as a bridge for client-server communication in Java web applications and is responsible for: processing client requests; generating http responses; dynamically generating web content; responding to customer interactions; managing http session state; and providing security protection. If you want to know more about Java, you can read the articles below this topic.
What is the role of Serverlet in JavaServlet serves as a bridge for client-server communication in Java Web applications and is responsible for: processing client requests; generating HTTP responses; dynamically generating Web content; responding to customer interactions; managing HTTP session state; and providing security protection.
How does GC in Java recycle objects?Garbage Collection in Java: Introduction to Object Recycling Mechanism Java uses an automatic garbage collection (GC) mechanism to manage memory and release objects that are no longer used. The GC tracks object references to determine which objects are no longer accessible and thus frees their memory. Object Reference An object survives when it is referenced by other objects. If no object refers to it, it is considered garbage. The GC collects and releases unreferenced garbage objects. The key concept of JavaGC is reachability: whether an object is referenced by other active objects. Root object: The initial object that is considered reachable, such as a global variable or a static variable. Garbage collector: The thread that performs garbage collection operations. How JavaGC works JavaGC is generational
Why is object synchronization important in Java?Synchronization of objects in Java is crucial to prevent thread safety issues such as data inconsistency, deadlock, and priority inversion in shared objects in a multi-threaded environment. Synchronization mechanisms include: 1) synchronization methods; 2) synchronization blocks; 3) lock objects. Synchronization ensures that a shared object is accessed by only one thread at a time, thereby maintaining data integrity and avoiding race conditions.
How to customize exceptions in Java?Creating custom exceptions in Java improves application robustness. It requires: Create a custom exception class, inherited from Exception or RuntimeException. Throws a custom exception, similar to throwing a regular exception. Catch custom exceptions when calling methods for more informative error messages.
What are the application scenarios of object pooling in Java?Application of object pool in Java: improve connection pool performance, pre-allocate database connections to avoid creation and closing operation overhead. Reduce object creation costs and pre-create expensive objects (such as image objects). Avoid resource leaks by managing the allocation and release of objects to ensure that objects are destroyed after use.
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