Shulou(Shulou.com)05/31 Report--

This article mainly introduces "what is the relationship between java array and container". In daily operation, I believe that many people have doubts about the relationship between java array and container. Xiaobian consulted all kinds of data and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the question of "what is the relationship between java array and container?" Next, please follow the editor to study!

1. Concept

Arrays are an efficient way to store and randomly access a sequence of object references, but when you create an array object (note the difference from an object array), the size of the array is fixed. when the array space is insufficient, create a new array and copy all references from the old array to the new array. (the array is a memory structure, while the container is a data structure) [if you know the length of the array and will not increase it in the future, you must use the array; if the length of the array is uncertain or the length will increase, use the container for convenience]

Container classes can only hold references to objects. Arrays can be created either to save primitive types directly or to save references to objects. Wrapper classes, such as Integer, Double, and so on, can be used in the container to save basic data type values.

2. The difference between array and container

In Java, now that you have a powerful container, you don't need an array? The answer is no.

Admittedly, in most cases, you should choose a container to store data.

However, arrays are not without merit:

In Java, arrays are the most efficient way to store and randomly access object reference sequences. Arrays are more efficient than containers such as ArrayList.

Arrays can hold value types, while containers cannot (in this case, wrapper classes must be used).

What are the commonly used java frameworks? 1. Spring Web Web MVC is a Java-based lightweight Web framework that implements the request-driven type of Spring design pattern.

2. Shirojia Apache Shiro is a security framework for Java.

3. Mybatistion MyBatis is an excellent persistence layer framework that supports normal SQL queries, stored procedures and advanced mapping.

4. DubboPol Dubbo is a distributed service framework.

5. Mavenfine Maven is a project management and build automation tool.

6. RabbitMQ _ RabbitMQ is a highly concurrent and reliable AMQP message queuing server implemented with Erlang.

7. EhcacheJournal EhCache is a pure Java in-process caching framework.

At this point, the study of "what is the relationship between the java array and the container" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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