public class ReflectTest {
    public static void main(String[] args) {
        try {
            Class obj =  ReflectTest.class.getClassLoader().loadClass("com.test.GetPackageName");
            GetPackageName name = (GetPackageName) obj.getConstructor(String.class,String.class).newInstance("hello","xx");
            System.out.println(name.toString());
        } 
 
catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InstantiationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
 

            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch
 
 (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
}

    public GetPackageName() {
        System.out.println(" 構造函數");
    }

    public GetPackageName(String str) {
        System.out.println(str);
    }
    public GetPackageName(String str,String str2) {
        System.out.println("c2"+str+str2);
    }

反射實例測試代碼