Java references and C pointers both point to a memory address. Operations on memory data are completed through references or pointers, but they have differences in implementation, principles, functions, etc. the difference.
(1) Type: Reference to a data element whose value is an address. The address encapsulated by Java can be converted into a string for viewing, and there is no need to worry about the length. A C pointer is a variable that holds an address. The length is generally the computer word length and can be considered an int.
Free online video tutorial recommendation: java video tutorial
(2) Memory occupied: There is no entity when the reference is declared and it does not occupy space. A C pointer will only be assigned a value if it will be used after it is declared. Memory will not be allocated if it is not needed.
(3) Type conversion: The type conversion of the reference may not be successful, an exception will be thrown at runtime or the compilation will not pass. The C pointer indicates a memory address and points to the memory. To the program, it is still an address, but the address pointed to may not be what the program wants.
(4) Initial value: The initial value of the reference is the java keyword null. C pointers are ints. If the pointer is not initialized, its value will not be fixed, which is very dangerous.
(5) Calculation: Reference cannot be calculated. C pointers are int, which can be calculated, such as or --, so pointers are often used instead of array subscripts.
(6) Memory leak: Java references will not cause memory leaks. C pointers are prone to memory leaks, so programmers should use them carefully and recycle them in time.
(7) As a parameter: Java method parameters only pass values. When a reference is used as a parameter, it will give a COPY of the value referenced in the function, so it is meaningless to exchange two reference parameters within the function. Because the function only exchanges the COPY value of the parameter, it makes sense to change the properties of a reference parameter within the function, because the object referenced by the COPY of the reference parameter is the same object as the reference parameter.
C When a pointer is used as a parameter for a function, it is actually the address it points to that is operated by the function, so operations using pointer parameters within the function will directly affect the address pointed to by the pointer (variable, object, function, etc.).
Recommended related articles and tutorials: java introductory tutorial
The above is the detailed content of The difference between references in java and pointers in c++. For more information, please follow other related articles on the PHP Chinese website!

本篇文章给大家带来了关于java的相关知识,其中主要介绍了关于结构化数据处理开源库SPL的相关问题,下面就一起来看一下java下理想的结构化数据处理类库,希望对大家有帮助。

本篇文章给大家带来了关于java的相关知识,其中主要介绍了关于PriorityQueue优先级队列的相关知识,Java集合框架中提供了PriorityQueue和PriorityBlockingQueue两种类型的优先级队列,PriorityQueue是线程不安全的,PriorityBlockingQueue是线程安全的,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于java的相关知识,其中主要介绍了关于java锁的相关问题,包括了独占锁、悲观锁、乐观锁、共享锁等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于java的相关知识,其中主要介绍了关于多线程的相关问题,包括了线程安装、线程加锁与线程不安全的原因、线程安全的标准类等等内容,希望对大家有帮助。

本篇文章给大家带来了关于Java的相关知识,其中主要介绍了关于关键字中this和super的相关问题,以及他们的一些区别,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于java的相关知识,其中主要介绍了关于枚举的相关问题,包括了枚举的基本操作、集合类对枚举的支持等等内容,下面一起来看一下,希望对大家有帮助。

封装是一种信息隐藏技术,是指一种将抽象性函式接口的实现细节部分包装、隐藏起来的方法;封装可以被认为是一个保护屏障,防止指定类的代码和数据被外部类定义的代码随机访问。封装可以通过关键字private,protected和public实现。

本篇文章给大家带来了关于java的相关知识,其中主要介绍了关于设计模式的相关问题,主要将装饰器模式的相关内容,指在不改变现有对象结构的情况下,动态地给该对象增加一些职责的模式,希望对大家有帮助。


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

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

SublimeText3 Linux new version
SublimeText3 Linux latest version

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

WebStorm Mac version
Useful JavaScript development tools

SublimeText3 English version
Recommended: Win version, supports code prompts!
