* Field：成員變量
?? ?* 操作：
?? ??? ?1. 設置值
?? ??? ??? ?* void set(Object obj, Object value) ?
?? ??? ?2. 獲取值
?? ??? ??? ?* get(Object obj)?

?? ??? ?3. 忽略訪問權限修飾符的安全檢查
?? ??? ??? ?* setAccessible(true):暴力反射

package cn.learn.reflect;import cn.learn.domain.Person;import java.lang.reflect.Field;public class ReflectDemo2 {/**Class對象功能：* 獲取功能：1. 獲取成員變量們* Field[] getFields()* Field getField(String name)* Field[] getDeclaredFields()* Field getDeclaredField(String name)2. 獲取構造方法們* Constructor<?>[] getConstructors()* Constructor<T> getConstructor(類<?>... parameterTypes)* Constructor<T> getDeclaredConstructor(類<?>... parameterTypes)* Constructor<?>[] getDeclaredConstructors()3. 獲取成員方法們：* Method[] getMethods()* Method getMethod(String name, 類<?>... parameterTypes)* Method[] getDeclaredMethods()* Method getDeclaredMethod(String name, 類<?>... parameterTypes)4. 獲取類名* String getName()*/public static void main(String[] args) throws Exception {//0.獲取Person的Class對象Class personClass = Person.class;/*1. 獲取成員變量們* Field[] getFields()* Field getField(String name)* Field[] getDeclaredFields()* Field getDeclaredField(String name)*///1.Field[] getFields()獲取所有public修飾的成員變量Field[] fields = personClass.getFields();for (Field field : fields) {System.out.println(field);}System.out.println("------------");//2.Field getField(String name)Field a = personClass.getField("a");//獲取成員變量a 的值Person p = new Person();Object value = a.get(p);System.out.println(value);//設置a的值a.set(p,"張三");System.out.println(p);System.out.println("===================");//Field[] getDeclaredFields()：獲取所有的成員變量，不考慮修飾符Field[] declaredFields = personClass.getDeclaredFields();for (Field declaredField : declaredFields) {System.out.println(declaredField);}//Field getDeclaredField(String name)Field d = personClass.getDeclaredField("d");//忽略訪問權限修飾符的安全檢查d.setAccessible(true);//暴力反射Object value2 = d.get(p);System.out.println(value2);}} package cn.learn.domain;public class Person {private String name;private int age;public String a;protected String b;String c;private String d;public Person() {}public Person(String name, int age) {this.name = name;this.age = age;}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;}@Overridepublic String toString() {return "Person{" +"name='" + name + '\'' +", age=" + age +", a='" + a + '\'' +", b='" + b + '\'' +", c='" + c + '\'' +", d='" + d + '\'' +'}';}public void eat(){System.out.println("eat...");}public void eat(String food){System.out.println("eat..."+food);} }

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