The difference between int and integer in java
1. Java basic data types and their encapsulation classes
java Data types include basic data types and reference data types. In order to facilitate the processing of basic data types as objects, Java introduces encapsulation classes corresponding to basic data types. For example, the int encapsulation class is Integer.
Online teaching video sharing: java teaching video
2. java automatic unboxing and automatic packing
1. Automatic boxing
Autoboxing is actually converting basic data types into reference data types (objects)
2. Automatic unboxing
Automatic unboxing is actually converting reference data types into basic data types
The code is as follows:
public static void main(String[] args) { Integer a = 1;//这里就用到了自动装箱;等同于Integer a = new Integer(1); int b = a - 1;//对象不能直接进行计算,所以这里有自动拆箱的操作,将a对象转换成基本数据类型,然后-1 System.out.println(a); System.out.println(b); }
Print results:
1 0
3. The difference between int and Interger
From the above we can see the difference between int and Interger:
int is the basic data type, and Integer is the reference data type;
## The default value of #int is 0, and the default value of Integer is null; int type directly stores values, and Integer needs to instantiate the object and point to the address of the object. Speaking of this, do you think that’s it? In fact, there are some detailed differences between them: as followspublic static void main(String[] args) { Integer a = new Integer(1); Integer b = new Integer(1); int c = 1; int d = 1; Integer e = 1; Integer f = 1; Integer g = 130; Integer h = 130; Integer i = new Integer(130); int j = 130; }
The valueOf method of Integer is as follows:
public static Integer valueOf(int i) { //IntegerCache.low == -128 ;IntegerCache.high == 127 //当数值大于-128小于127时,进行缓存;否则重新new一个。 if (i >= IntegerCache.low && i <= IntegerCache.high) return IntegerCache.cache[i + (-IntegerCache.low)]; return new Integer(i); }
The above is the detailed content of The difference between int and integer in java. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



H5. The main difference between mini programs and APP is: technical architecture: H5 is based on web technology, and mini programs and APP are independent applications. Experience and functions: H5 is light and easy to use, with limited functions; mini programs are lightweight and have good interactiveness; APPs are powerful and have smooth experience. Compatibility: H5 is cross-platform compatible, applets and APPs are restricted by the platform. Development cost: H5 has low development cost, medium mini programs, and highest APP. Applicable scenarios: H5 is suitable for information display, applets are suitable for lightweight applications, and APPs are suitable for complex functions.

Export password-protected PDF in Photoshop: Open the image file. Click "File"> "Export"> "Export as PDF". Set the "Security" option and enter the same password twice. Click "Export" to generate a PDF file.

The necessity of registering VueRouter in the index.js file under the router folder When developing Vue applications, you often encounter problems with routing configuration. Special...

Detailed explanation of XPath search method under DOM nodes In JavaScript, we often need to find specific nodes from the DOM tree based on XPath expressions. If you need to...

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

In-depth discussion of the differences in console.log output in this article will analyze the reasons why the output results of console.log function in a piece of code are different. Code snippets involve URL parameter resolution...

There are differences in the promotion methods of H5 and mini programs: platform dependence: H5 depends on the browser, and mini programs rely on specific platforms (such as WeChat). User experience: The H5 experience is poor, and the mini program provides a smooth experience similar to native applications. Communication method: H5 is spread through links, and mini programs are shared or searched through the platform. H5 promotion methods: social sharing, email marketing, QR code, SEO, paid advertising. Mini program promotion methods: platform promotion, social sharing, offline promotion, ASO, cooperation with other platforms.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
