java类反射获取构造方法

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

//反射获取构造方法并实例化对象
public class ReflectDemo2 {
    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        //获取字节码对象
        Class<Student> studentClass = Student.class;
        //获取构造方法
//        Constructor<?>[] constructors = studentClass.getConstructors();
//        for (Constructor<?> constructor : constructors) {
//            System.out.println(constructor);
//        }

//        Constructor<?>[] declaredConstructors = studentClass.getDeclaredConstructors();
//        for (Constructor<?> declaredConstructor : declaredConstructors) {
//            System.out.println(declaredConstructor);
//        }
//

//        Constructor<Student> constructor = studentClass.getConstructor();
//        System.out.println(constructor);

        Constructor<Student> declaredConstructor = studentClass.getDeclaredConstructor();
//        System.out.println(declaredConstructor);

        //无参构造实例化对象
        Student student = declaredConstructor.newInstance();
        System.out.println(student);

        //有参构造实例化对象
        Constructor<Student> constructor = studentClass.getConstructor(String.class, int.class, String.class);
        Student student1 = constructor.newInstance("郭奉孝", 24, "魏国");
        System.out.println(student1);
    }
}