Java.lang.Runtime.load() Method


The java.lang.Runtime.load(String filename) method loads the specified filename as a dynamic library. The filename argument must be a complete path name, (for example Runtime.getRuntime().load(). First, if there is a security manager, its checkLink method is called with the filename as its argument. This may result in a security exception. This is similar to the method loadLibrary(String), but it accepts a general file name as an argument rather than just a library name, allowing any file of native code to be loaded. The method System.load(String) is the conventional and convenient means of invoking this method.


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

public void load(String filename)


filename − the file to load.

Return Value

This method does not return a 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 lang.Runtime.load() method.

package com.tutorialspoint;

public class RuntimeDemo {

   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.out.println("Library Loaded.");

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

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