JAVA类加载机制

protected synchronized Class<?> loadClass  
    (String name, boolean resolve)  
    throws ClassNotFoundException{  
    // First check if the class is already loaded  
    Class c = findLoadedClass(name);  
    if (c == null) {  
        try {  
            if (parent != null) {  
                c = parent.loadClass(name, false);  
            } else {  
                c = findBootstrapClass0(name);  
            }  
        } catch (ClassNotFoundException e) {  
            // If still not found, then invoke  
            // findClass to find the class.  
            c = findClass(name);  
        }  
    }  
    if (resolve) {  
            resolveClass(c);  
    }  
    return c;  
}