Typesafe enums offer a better alternative to Java's traditional enumerated types. Here's how to use typesafe enums correctly in your Java code.

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...

The java.lang package contains classes that are fundamental to the design of the Java language. The most important classes are Object, which is the root of the class hierarchy, and Class, instances of ...

本文简单分析了下Integer类型的== 比较，解释了为啥结果不一致，所以今后碰到Integer比较的时候，建议使用equals。

Handler dispatch failed: java.lang.NoSuchMethodError: 'java.lang.Object org.hibernate.ScrollableResults.get (int)' #3564 ...

在Java中，数组的长度最大值取决于JVM的实现和操作系统的限制。 通常情况下，Java中的数组长度最大值为一个int类型的极限值，即2^31-1（即2147483647），因为数组的长度是作为一个int类型的整数存储的。

The error 500: Java.lang.nullpointerexception is an error that is faced by some developers when executing their code. Moreover, end-users also encounter ...

Integer overflow is a common cause of software failure and security vulnerability. Existing approaches to detecting integer overflow errors rely on traditional static code analysis and dynamic testing ...

Expected behavior Actual behavior I got some classCastException : Exception in thread "redisson-3-38" java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long at ...

Troubleshooting Java memory problems can be tricky. In this article, we discuss the proper approach for locating them, and we take a look at a wide range of tools we can use to eradicate them.