In Java, a utility class is a class that defines a set of methods that perform common functions. This post shows the most frequently used Java utility classes and their most commonly used methods. Both the class list and their method list are ordered…

鄙人最近尝试着翻译了自己的第一篇英文技术文档.Java Nested Classes Reference From Oracle Documentation 目录 嵌套类-Nested Classes 为什么使用嵌套类-Why Use Nested Classes? 静态嵌套类-Static Nested Classes 内部类-Inner Classes 局部类-Local Classes 匿名类-Anonymous Classes 变量覆盖问题-Shadowing 序列化问题-Seriali…

When thinking about inner classes in java, the first thing that comes to my mind is that, WHY do we need to add inner classes to normal one? Leave alone all the specific details of the Java syntax, I think the reason is quite SIMPLE: we are human bei…

Java’s stream classes are good for streaming sequences of bytes, but they’re not good for streaming sequences of characters because bytes and characters are two different things. A -bit data item and a character represents a -bit data item. Also, Jav…

(本文参考:http://docs.oracle.com/javase/tutorial/java/javaOO/nested.html) Nested Classes class OuterClass { ...... class StaticNestedClass { ...... } ...... class InnerClass { ...... } 定义 nested classes (嵌套类)分为两种:non-static与static,前者通常称作inner classes,后者称…

1. 错误显示页 2. 解决步骤 2.1. 查看 root cause 信息 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMapping' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: Initialization of bean failed; nested excepti…

References: [1] http://tutorials.jenkov.com/java-date-time/index.html [2] https://docs.oracle.com/javase/tutorial/datetime/iso/period.html 1. Java 8 and Java 7 Date classes The main change in the Java 8 date time API is that date and time is now no l…

MInimize the accessibility of classes and members 这个叫做所谓的 information hiding ,这么做在于让程序耦合度更低,增加程序的健壮性等等,反正就是很有必要和有用. 四个修饰等级  private :只能当前class中调用 package-praivate 声明class,没有修饰的时候是默认 package-praivate,表示在一个 package里面使用 protect  subclass里面调用 public 任意地方…

http://www.javaworld.com/article/2979739/learn-java/java-101-classes-and-objects-in-java.html?page=3 class Book { // ... static int count; } This example declares a count integer field that stores the number of Book objects created. The declaration b…

[src: https://blog.idrsolutions.com/2012/05/replacing-the-deprecated-java-jpeg-classes-for-java-7/] In the early days of Java, Sun produced a really handy set of classes to handle JPEG images. These included some really nifty little features like the…