首先建一個實體類，用于數據訪問 package star.july.entity;public class Student {private String name;int age;public String address;public Student() {super();}//私有構造方法private Student(String name) {super();this.name = name;}public Student(String name, int age) {super();this.name = name;this.age = age;}public Student(String name, int age, String address) {super();this.name = name;this.age = age;this.address = address;}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 getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "Student [name=" + name + ", age=" + age + ", address="+ address + "]";} }


反射結果： package star.july.dao;import java.lang.annotation.Annotation; import java.lang.reflect.Constructor; import java.lang.reflect.Field;/*** 反射:通過反射獲取成員變量并使用* @author Starjuly**/ public class PrivateField {public static void main(String[] args) throws Exception {//獲取字節碼文件Class clazz = Class.forName("star.july.entity.Student");// Constructor con = clazz.getConstructor(); //獲取公共的構造方法Constructor con = clazz.getDeclaredConstructor(); //獲取所有的構造方法//創建實例Object obj = con.newInstance();//獲取數據類型:公有的Field addressField = clazz.getField("address");//給該對象的數據類型賦值addressField.set(obj, "廣州");System.out.println(obj);//對私有的數據類型進行獲取Field nameField = clazz.getDeclaredField("name");//要進行暴力反射才能訪問私有類型nameField.setAccessible(true);//賦值nameField.set(obj, "徐鳳年");System.out.println(obj); } }

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