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Copy pathNewInstanceDemo.java
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38 lines (29 loc) · 1.37 KB
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package reflection;
import reflection.bean.People;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
/**
* @program: Java-learn
* @description: 使用反射创建实例
* @author: anthony1314
* @create: 2020-02-18 16:45
**/
public class NewInstanceDemo {
public static void main(String[] args) throws IllegalAccessException, InstantiationException, NoSuchMethodException, InvocationTargetException {
Class<People> c = People.class;
//System.out.println(p.newInstance());
// 必须保证构造方法不被私有化 且无参
Constructor<People> con = c.getDeclaredConstructor();//调用默认构造器
System.out.println(con);
//私有的成员是受保护的,不能直接访问
//若要访问私有的成员,得先申请一下
con.setAccessible(true);//允许访问
People p = con.newInstance();//成功，通过私有的受保护的构造方法创建了对象
System.out.println("无参构造方法"+p);
con = c.getDeclaredConstructor(String.class);//获取指定的构造方法
System.out.println(con);
con.setAccessible(true);//允许访问
p = con.newInstance("codull");//成功，通过私有的受保护的构造方法创建了对象
System.out.println("String构造方法"+p + " p的name " + p.getName());
}
}