e068. loading a class that is not on the classpath.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 20 行

A URLClassLoader can be used to load classes in any directory. 
    // Create a File object on the root of the directory containing the class file
    File file = new File("c:\\myclasses\\");
    
    try {
        // Convert File to a URL
        URL url = file.toURL();          // file:/c:/myclasses/
        URL[] urls = new URL[]{url};
    
        // Create a new class loader with the directory
        ClassLoader cl = new URLClassLoader(urls);
    
        // Load in the class; MyClass.class should be located in
        // the directory file:/c:/myclasses/com/mycompany
        Class cls = cl.loadClass("com.mycompany.MyClass");
    } catch (MalformedURLException e) {
    } catch (ClassNotFoundException e) {
    }