Arraylist Java

Java Iterator is an interface that provides only the basic rules for iteration, and a foreach loop can be used for any container that implements the Iterable interface.

EJP is a powerful and easy-to-use http://www.aliyun.com/zixun/aggregation/22.html "> relational database Persistence Java API. The main features of EJP include: 1, Object/Relationship (object/relational) automatic Mapping (A-O/RM) 2, automatic processing of all associations 3, automatic persistence tracking EJP no need for mapping annotations or XML matching ...

Easy Java Persistence (EJP) is an easily annotated and freely configurable persistent Java API with automatic object/relational mappings (A-O/RM), http://www.aliyun.com/zixun/aggregation/ 18860.html > automatically handles all association and persistence tracking functions. Easy Java Persistence 2.8 This version permanently deletes the license limit and the algorithm for changing the license. ...

Iterator and iterable objects in Java. Let's take a look at the difference between these two objects and how to implement the for each loop in a custom class.

Java iterator is mainly used to manipulate collection objects in java. Java provides an iterator interface Iterator. Iterator can only move forward and cannot be rolled back.

Java Iterable interface and the Iterator interface. The class that implements the Iterable interface is iterable; the class that implements the Iterator interface is an iterator.

In Java Web Development, it is often necessary to export a large amount of data to http://www.aliyun.com/zixun/aggregation/16544.html ">excel, using POI, JXL directly generate Excel, 　　It is easy to cause memory overflow. 　　1, there is a way, is to write data in CSV format file. 　　1 CSV file can be opened directly with Excel. 2 Write CSV file efficiency and write TXT file efficiency ...

Cloud computing: Redefining IT over the past year, cloud computing exploded, including a variety of applications-such as Salesforce CRM and Google apps-and services-such as hosting Amazon elastic Compute Cloud (Amaz On EC2) ibm®db2®, Google ...

Often we want to delete some elements in the collection.　　Some might write that. public void operate (List list) {for (Iterator it = List.iterator (); It.hasnext ();)　　{String str = (string) it.next (); if (Str.equals ("Chengang")) {list ....

To use Hadoop, data consolidation is critical and hbase is widely used. In general, you need to transfer data from existing types of databases or data files to HBase for different scenario patterns. The common approach is to use the Put method in the HBase API, to use the HBase Bulk Load tool, and to use a custom mapreduce job. The book "HBase Administration Cookbook" has a detailed description of these three ways, by Imp ...