Simple add() method is used for adding an element at the end of the list however there is another variant of add method which is used for adding an element to the specified index. public void add(int index, Object element) This method adds the elemen
最近在获取mongodb某个集合的数据过程中,在进行排序的过程中报错,具体报错信息如下: Error: error: { , "errmsg" : "Executor error during find command: OperationFailed: Sort op eration used more than the maximum bytes of RAM. Add an index, or speci fy a smaller limit.", , &qu
w https://dev.mysql.com/doc/refman/5.7/en/create-index.html MySQL :: MySQL 5.7 Reference Manual :: B.5.4.3 Problems with NULL Valueshttps://dev.mysql.com/doc/refman/5.7/en/problems-with-null.html You can add an index on a column that can have NULL va
用法一:常量 在JDK1.5 之前,我们定义常量都是: public static fianl.....现在好了,有了枚举,可以把相关的常量分组到一个枚举类型里,而且枚举提供了比常量更多的方法. public enum Color { RED, GREEN, BLANK, YELLOW } 用法二:switch JDK1.6之前的switch语句只支持int,char,enum类型,使用枚举,能让我们的代码可读性更强. enum Signal { GREEN, YELLOW, RED }
说明 此文章分两部分,1.ArrayList用法.2.源码分析.先用法后分析是为了以后忘了查阅起来方便-- ArrayList 基本用法 1.创建ArrayList对象 //创建默认容量的数组列表(默认为10) ArrayList<E> a = new ArrayList<E>(); //创建容量为initialCapacity的数组列表 ArrayList<E> a = new ArrayList<E>(int initialCapacity); //用一
