Suppose, you want to set some application wide constants/parameters. In this scenario, XML would be a better choice because this is not related with any specific piece of code. If you want to expose some method as a service, annotation would be a better choice as it needs to be tightly ...
Most common interview questions are “How HashMap works in java”, “How get and put method of HashMap work internally”. Here I am trying to explain internal functionality with an easy example. Rather than going through theory, we will start with example first, so that you will get better...
In Java, memory management is handled by JVM automatically to store your variables, classes, fields and beyond… The first thing we will learn is in JVM, memory splitted into two regions. 在Java 中,内存管理由 JVM 自动处理,用于存储变量、类、字段和其他内容...我们首先要了解的是,在 JVM 中,...
The first one is used to set the maximum compilation level. The most common use case for this is probably to force HotSpot to only use the C1 compiler in order to bypass some C2 bug or to stress test C1. The second option will cause HotSpot to not use the Tiered Compilation heuristics...
How Java Memory Works?. Before we move on to the performence… | by Berkay Haberal | Jul, 2023 | Stackademic (medium.com) Before we move on to the performence things, we need to learn that what is really going on in the background of JVM (Java Virtual Machine). 在开始讨论性能问题...
How does the resultset work in JDBC? Now let’s see how the resultset works in JDBC as follows. ResultSet Interface is available in the java.sql bundle. It is utilized to store the information which is retrieved from the data set table after the execution of the SQL articulations in the...
Objects referenced in the VM stack, that is the local variable table in the stack frame In this case, s is the GC root. When s is set to null, the localParameter object has its reference chain with the GC root broken, and the object will be garbage-collected. ...
The request header contains useful information about the client environment and the entity body of the request. For example, it could contain the language the browser is set for, the length of the entity body, and so on. Each header is separated by a carriage return/linefeed (CRLF) sequence...
A Cryptographic Service Provider (provider) refers to a package (or a set of packages) that supply a concrete implementation of a subset of the cryptography aspects of the JDK Security API. The java.security.Provider class encapsulates the notion of a security provider in the Java platform. It...
Now that we’re all set up with a memory analyzer, let’s investigate an application with a memory leak issue, which we’ll callMemLeak. MemLeak Of course, there are a number of ways to create memory leaks in Java. For simplicity we will define a class to be a key in aHashMap, ...