枚举和反射

enum

package cn.jiemoxiaodi_enum;

public class School {
public static School s1=new School("北1京", "1sdfds");
public static School s2=new School("北京2", "2sdfds");
public static School s3=new School("北京3", "3sdfds");

private String name;
private String teacher;

@Override
public String toString() {
return "School [name=" + name + ", teacher=" + teacher + "]";
}

private School() {
super();
}

private School(String name, String teacher) {
super();
this.name = name;
this.teacher = teacher;
}
}

---

package cn.jiemoxiaodi_enum;

public enum School2 {

shanghai("比较", "sdf"), bj("3", "44"), sz("55", "dfd"), hz("sdf", "sdf");

private School2(String name, String ordinal) {
}

}

int short enum

枚举中可以 用在switch 枚举中必须的进行相关的（abstract Method）实现

反射

万物都是对象：

java=>编译器=》class ==类加载器=》jvm—>

反射就是用来描述与字节码（class）相关的事物

package cn.jiemoxiaodi.reflect;

import java.io.FileInputStream;
import java.util.Properties;

import org.junit.Test;

public class UserDaoTest {

/**
* @param args
* @throws Exception
*
*/
@Test
public void testUserDao() throws Exception {

Properties pro=new Properties();
pro.load(new FileInputStream("src/cn/jiemoxiaodi/reflect/beanname.properties"));

String str=pro.get("UserDao").toString();
Class c1 = Class.forName(str);
UserDao ud=(UserDao) c1.newInstance();
ud.save();
}
}

构造函数 constructor

方法 method

字段 fields