-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
4 changed files
with
35 additions
and
6 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,30 @@ | ||
# 8-Native关键字 | ||
|
||
在Java中,native关键字用于声明一个方法是由本地代码(通常是C或C++)实现的。这意味着该方法的具体实现不是用Java编写的,而是由底层的本地代码提供。 | ||
|
||
## native关键字的作用 | ||
|
||
- 与本地代码进行交互:通过native方法,Java程序可以与本地代码进行交互,调用本地库中的函数,实现更高效的操作,或者访问底层系统资源。 | ||
- 提高性能:使用本地代码实现某些功能通常比纯Java代码更高效。通过native方法,可以利用底层系统资源和优化的算法,提高程序的性能。 | ||
|
||
## native关键字的使用方法 | ||
|
||
要声明一个native方法,只需在Java方法的声明中加上native关键字,并且不需要提供方法的实现。例如: | ||
```java | ||
public native void nativeMethod(); | ||
``` | ||
|
||
在这个例子中,`nativeMethod()`是一个native方法,它的具体实现将在本地代码中提供。 | ||
|
||
为了使用native方法,必须在Java程序中加载本地库,并确保本地库中包含了所需的函数。本地库可以使用Java的JNI(Java Native Interface)来编写,并在程序运行时通过`System.loadLibrary()` 方法加载。下面是一个简单的示例: | ||
|
||
```java | ||
public class NativeExample { | ||
static { System.loadLibrary("nativeLibrary"); } | ||
public native void nativeMethod(); | ||
public static void main(String[] args) { new NativeExample().nativeMethod(); } | ||
} | ||
``` | ||
|
||
|
||
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters