【7】java 反射详解

package Study;

class User {
    public String toString() {
        return "User: 成功";
    }

    public void func() {
        System.out.println("User: func");
    }
}

public class reflect {
    public static void main(String[] args) throws IllegalAccessException, InstantiationException, ClassNotFoundException {
        System.out.println("方法一:");
        Class<User> method1 = User.class;
        User user1 = method1.newInstance();
        user1.func();
        System.out.println("method1: "+method1.toString());

        System.out.println("方法二:");
        Class<?> method2 = Class.forName("Study.User");
        User user2 = (User) method2.newInstance();
        user2.func();
        System.out.println("method2: "+method2.toString());

        System.out.println("方法三:");
        Class<?> method3 = new User().getClass();
        User user3 = (User) method3.newInstance();
        user3.func();
        System.out.println("method3: "+method3.toString());
    }
}