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Java System load() Method

The Java System load() method loads a code file with the specified filename from the local file system as a dynamic library. The filename argument must be a complete path name.

Following is the declaration for java.lang.System.load() method

public static void load(String filename)

filename − This is the file to load.

This method does not return any value.

• SecurityException − if a security manager exists and its checkLink method doesn't allow loading of the specified dynamic library.

• UnsatisfiedLinkError − if the file does not exist.

• NullPointerException − if filename is null

The following example shows the usage of Java System load() method. In this program, using load() method, we're passing complete path of crypt32.dll to load it and corresponding message is printed.

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) {

      // print when the program starts
      System.out.println("Program starting...");

      // load a library that is Windows/System32 folder
      System.out.println("Loading Library...");
      System.load("C:/Windows/System32/crypt32.dll");
      System.out.println("Library Loaded.");
   }
}

Let us compile and run the above program, this will produce the following result −

Program starting...
Loading Library...
Library Loaded.

The following example shows the usage of Java System load() method. In this program, using load() method, we're passing path of a non-existing dll to load it and corresponding exception message is printed.

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) {

      // print when the program starts
      System.out.println("Program starting...");

      // load a library that is Windows/System32 folder
      System.out.println("Loading Library...");
      System.load("C:/Windows/System32/crypt.dll");
      System.out.println("Library Loaded.");
   }
}

Let us compile and run the above program, this will produce the following result −

Program starting...
Loading Library...
Exception in thread "main" java.lang.UnsatisfiedLinkError: Can't load library: C:\Windows\System32\crypt.dll
	at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2422)
	at java.base/java.lang.Runtime.load0(Runtime.java:852)
	at java.base/java.lang.System.load(System.java:2025)
	at com.tutorialspoint.SystemDemo.main(SystemDemo.java:12)

The following example shows the usage of Java System load() method. In this program, using load() method, we're passing complete path of filemgmt.dll to load it and corresponding message is printed.

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) {

      // print when the program starts
      System.out.println("Program starting...");

      // load a library that is Windows/System32 folder
      System.out.println("Loading Library...");
      System.load("C:/Windows/System32/filemgmt.dll");
      System.out.println("Library Loaded.");
   }
}

Let us compile and run the above program, this will produce the following result −

Program starting...
Loading Library...
Library Loaded.

java_lang_system.htm

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