public static Class<?> loadClass(final String qualifiedClassName, ClassLoader loader) {
        try {
            return loadClassEx(qualifiedClassName, loader);
        } catch (ClassNotFoundException e) {
            return null;
        }
    }
public static Class<?> loadClass(final String qualifiedClassName, ClassLoader loader) {
        try {
            return loadClassEx(qualifiedClassName, loader);
        } catch (ClassNotFoundException e) {
            return null;
        }
    }
public static Class < ? > loadClass ( final String qualifiedClassName , ClassLoader loader ) { try { return loadClassEx ( qualifiedClassName , loader ) ; } catch ( ClassNotFoundException e ) { return null ; } }
使用默认的 ClassLoader 去载入类.
@return null if class not found
使用默认的 ClassLoader 去载入类 .