java反射类的字段

java反射类的字段：

package com.ma.reflection;

import java.lang.reflect.Field;

import org.junit.Test;

import com.ma.bean.StudentBean;

/**
 * 反射字段
 * @author ma
 *
 */
public class Demo4 {
	/**
	 * 反射公有字段
	 * @throws ClassNotFoundException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalAccessException
	 * @throws IllegalArgumentException
	 */
	@Test
	public void test1() throws ClassNotFoundException, SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException{
		//加载类
		Class<?> clazz = Class.forName("com.ma.bean.StudentBean");

		StudentBean s = new StudentBean();

		//加载字段
		Field field = clazz.getField("name");

		//调用字段
		String name = (String)field.get(new StudentBean());

		//设置字段值
		field.set(s, (Object)"关悦");

		//输出字段
		System.out.println(s.name);
		System.out.println(name);

	}
	/**
	 * 反射私有字段
	 * @throws ClassNotFoundException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalAccessException
	 * @throws IllegalArgumentException
	 */
	@Test
	public void test2() throws ClassNotFoundException, SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException{
		//加载类
		Class<?> clazz = Class.forName("com.ma.bean.StudentBean");
		StudentBean s = new StudentBean();
		//加载字段
		Field field = clazz.getDeclaredField("work");
		field.setAccessible(true);

		//获取字段
		String work = (String)field.get(s);

		System.out.println(work);
	}
	/**
	 * 反射静态字段
	 * @throws ClassNotFoundException
	 * @throws NoSuchFieldException
	 * @throws SecurityException
	 * @throws IllegalAccessException
	 * @throws IllegalArgumentException
	 */
	@Test
	public void test3() throws ClassNotFoundException, SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException{
		////加载类
		Class<?> clazz = Class.forName("com.ma.bean.StudentBean");
		StudentBean s = new StudentBean();
		//加载字段
		Field field = clazz.getDeclaredField("sex");
		field.setAccessible(true);
		//获取字段
		String sex = (String)field.get(s);

		System.out.println(sex);
	}
	/**
	 * 反射字段
	 */
	@Test
	public void test4(){
		//
		//
		//
	}
	/**
	 * 反射字段
	 */
	@Test
	public void test5(){
		//
		//
		//
	}
}

　　实体类Student

package com.ma.bean;
/**
 * 学生类
 * @author ma
 *
 */
public class StudentBean {

	public String name = "刘备";
	public int age;
	private String work = "教师";
	private static String sex = "男";

	public StudentBean() {
		super();
	}

	public void eat(){
		System.out.println("吃饭了。。。。。。。。。。。。。。");
	}

	public void play(String name,int age){
		System.out.println(name+":去玩了哟。。。。。。。。。"+age);
	}

	public void run(int  ...intaa){
		System.out.println(":这是可变参数方法");
	}

	private void jump(){
		System.out.println("这是私有方法");
	}

	public static void sleep(int age){
		System.out.println(age+":这是静态方法");
	}

	public static void main(String[] args) {
		System.out.println("这是main方法！！！");
	}
}

原文地址：https://www.cnblogs.com/majingang/p/9116063.html