java反射之Field 设置属性值

进行了如下的实验

import java.lang.reflect.Field;

public class User {


    private String  name;

    private Integer age;

    private Double  height;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Double getHeight() {
        return height;
    }

    public void setHeight(Double height) {
        this.height = height;
    }



    public static void main(String[] args) {
        User user1 = new User();
        try {
            Field field = User.class.getDeclaredField("name");

            //setAccessible这行代码把对象上的name字段设置为可访问
            System.out.println("Modifier before modify:"+field + " " +field.getModifiers());
            field.setAccessible(true);
            System.out.println("Modifier after modify:"+field + " " +field.getModifiers());

            // 设置该user1的name属性
            field.set(user1, "zhangsan");
            System.out.println(user1.getName());
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }



}

输出结果为

Modifier before modify:private java.lang.String com.huawei.ebus.field.test.test1.User.name 2
Modifier after modify:private java.lang.String com.huawei.ebus.field.test.test1.User.name 2
zhangsan

Process finished with exit code 0