Do you need to know how to sort Java objects in a collection, array, or map? Here's how to use the Comparable and Comparator interfaces and avoid ClassCastExceptions. Programmers frequently need to ...

arraylist中是一个自定义的数据结构： 我的问题是：如何先按类型再按ID，甚至再按数据1、数据2排序给这个list排序，有建议的朋友都有份。 comparator是一个接口，使用其排序时，只需要实现其方法然后调用**list.sort(new Comparator())**即可;collections.sort其实也是用的 ...

There are many ways to do anything in Java, and there is no conclusive right way. Often, the right way is simply the way you know best. Imperative loops like the for loop are the most basic way to do ...