Java ClassLoader findLibrary（）方法与示例

ClassLoader类findLibrary()方法 (ClassLoader Class findLibrary() method)

findLibrary() method is available in java.lang package.
findLibrary()方法在java.lang包中可用。
findLibrary() method is used to find the absolute pathname of the given native library.
findLibrary()方法用于查找给定本机库的绝对路径名。
findLibrary() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
findLibrary()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
findLibrary() method does not throw an exception at the time of returning the absolute path of the given library.
返回给定库的绝对路径时， findLibrary()方法不会引发异常。

Syntax:

句法：

    protected String findLibrary(String lib_name);

Parameter(s):

参数：

String lib_name – represents the name of the library.
字符串lib_name –代表库的名称。

Return value:

返回值：

The return type of this method is String, it returns an absolute path of the given library.

该方法的返回类型为String ，它返回给定库的绝对路径。

Note: It returns null when JVM finds the library along the path given as the system property "java.library.path"

注意：当JVM沿着系统属性“ java.library.path”给出的路径找到库时，它将返回null。

Example:

例：

// Java program to demonstrate the example 
// of String findLibrary(String lib_name) method of ClassLoader 
class FindLibrary extends ClassLoader {
// Override findLibrary() of ClassLoader
protected String findLibrary(String lib_name) {
if (lib_name.equals("java.lang")) {}
return lib_name;
}
}
public class Main {
public static void main(String[] args) throws Exception {
// Creating an instance of FindLibrary
FindLibrary fl = new FindLibrary();
// we are finding the library java.lang and it returns
// it already exists in Java
String library = fl.findLibrary("java.lang");
System.out.println("Library Found: " + library);
}
}

Output

输出量