java反射笔记

package test1125;

public class classTest {
    public static void main(String[] args) {
        try {
            // 获取Class对象的三种方式
            System.out.println("根据类名:  \t" + User.class);
            System.out.println("根据对象:  \t" + new User().getClass());
            Class<?> userClass = Class.forName("test1125.User");
            System.out.println("根据全限定类名:\t" + userClass);

            // 常用的方法
            System.out.println("获取全限定类名:\t" + userClass.getName());
            System.out.println("获取类名:\t" + userClass.getSimpleName());
            System.out.println("实例化:\t" + userClass.getDeclaredConstructor().newInstance());
        } catch (ClassNotFoundException e) {
            System.out.println("找不到类: " + e.getMessage());
        } catch (Exception e) {
            System.out.println("发生异常: " + e.getMessage());
        }
    }
}

// User类的定义
package test1125;

public class User {
    private String name;

    public User() {
        this.name = "默认用户";
    }

    @Override
    public String toString() {
        return "User{name='" + name + "'}";
    }
}