GitHub

映射报错java.lang.ClassCastException: java.util.ArrayList cannot be cast to

// 解析每行结果在listener中处理 ExcelListener listener = new ExcelListener(); ExcelReader excelReader = new ExcelReader(inputStream,null, listener,true ...
InfoWorld

How to use Java generics to avoid ClassCastExceptions

Using generics results in more robust code and avoids ClassCastExceptions in your Java programs. This in-depth tutorial introduces you to generics and their types and methods. Generics are used in ...
TheServerSide

How to make multiple values per key in a Java map possible example

Community driven content discussing all aspects of software development from DevOps to design patterns. Java collection classes allow a developer to keep track of contained items in one of two ways, ...
TheServerSide

Java array size, length and loop examples

Community driven content discussing all aspects of software development from DevOps to design patterns. Here are the most important concepts developers must know when they size Java arrays and deal ...
GitHub

Java error on startup when using a custom JRE

java.lang.RuntimeException: Exception in Application init method at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:895) at com.sun ...
InfoWorld

Avoid memory leaks in inner classes

If you’ve read my Java 101 tutorial introducing static classes and inner classes, you should be familiar with the basics of working with nested classes in Java code. In this associated tip, I’ll walk ...
Android Authority

How to create an array in Java

An array in Java is a type of variable that can store multiple values. It stores these values based on a key that can be used to subsequently look up that information. Arrays can be useful for ...