/**
 * @author peter
 * 2018/9/4 19:04
 */
public class Reflect {
    private String name;
    private int age;
    private String cupSize;

    public Reflect(String name, int age, String cupSize) {
        this.name = name;
        this.age = age;
        this.cupSize = cupSize;
    }


    public String getName
 
() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public String getCupSize() {
        return cupSize;
    }

    public void
 
 setCupSize(String cupSize) {
        this.cupSize = cupSize;
    }
}

測試

import java.lang.reflect.Field;
import java.util.Arrays;

/**
 * @author peter
 * 2018/9/4 19:11
 */
public class ReflectTest {
    public static void main(String[] args) {
        Reflect reflectTest = new Reflect("lucy", 18, "F"
 
);
        Class<? extends Reflect> rtClass = reflectTest.getClass();
        Field[] fields = rtClass.getDeclaredFields();//獲取所有屬性
        Arrays.stream(fields).forEach(field -> {
            //獲取是否可訪問
            boolean flag = field.isAccessible();
            try {
                //設定該屬性總是可訪問
                field.setAccessible(true);
                System.out.println("成員變數"+field.getName()+"的值為："+field.get(reflectTest));
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
           //還原可訪問許可權
           field.setAccessible(flag);

        });
    }
}

列印的結果：

成員變數name的值為：lucy
成員變數age的值為：18
成員變數cupSize的值為：F