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Java ClassLoader findLibrary() method with example

ClassLoader Class findLibrary() method: Here, we are going to learn about the findLibrary() method of ClassLoader Class with its syntax and example.
Submitted by Preeti Jain, on November 28, 2019

ClassLoader Class findLibrary() method

• findLibrary() method is available in java.lang package.
• findLibrary() method is used to find the absolute pathname of the given native library.
• 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() method does not throw an exception at the time of returning the absolute path of the given library.

Syntax:

    protected String findLibrary(String lib_name);

Parameter(s):

• String lib_name – represents the name of the library.

Return value:

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

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

Example:

// 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

Library Found: java.lang