问题描述
importjava.lang.reflect.*;publicclassDemo{publicstaticvoidmain(String[]args){Classclazz=Person.Class;//加载Person类的字节码进内存Constructorc=clazz.getConstructor(null);//得到构造方法，并用null声明是无参数的构造方法Personp=(Person)c.newInstance(null);//通过无参的构造函数实例化对象，得到返回值是Object并用Person强转System.out.println(p.name);//打印出对象的公共name}}classPerson{publicStringname="aaaa";Person(){}}
怎么修改呢
解决方案
解决方案二：
Person.class不是Person.Class构造方法加上publicpublicPerson(){}
解决方案三：
那个classc小写马虎大意了那个方法为什么要声明为public呢版主老大多谢及时回复了
解决方案四：
/***Returnsa<code>Constructor</code>objectthatreflectsthespecified*publicconstructoroftheclassrepresentedbythis<code>Class</code>*object.The<code>parameterTypes</code>parameterisanarrayof*<code>Class</code>objectsthatidentifytheconstructor'sformal*parametertypes,indeclaredorder.**Ifthis<code>Class</code>objectrepresentsaninnerclass*declaredinanon-staticcontext,theformalparametertypes*includetheexplicitenclosinginstanceasthefirstparameter.**<p>Theconstructortoreflectisthepublicconstructoroftheclass*representedbythis<code>Class</code>objectwhoseformalparameter*typesmatchthosespecifiedby<code>parameterTypes</code>.**@paramparameterTypestheparameterarray*@returnthe<code>Constructor</code>objectofthepublicconstructorthat*matchesthespecified<code>parameterTypes</code>*@exceptionNoSuchMethodExceptionifamatchingmethodisnotfound.*@exceptionSecurityException*Ifasecuritymanager,<i>s</i>,ispresentandanyofthe*followingconditionsismet:**<ul>**<li>invocationof*<tt>{@linkSecurityManager#checkMemberAccess*s.checkMemberAccess(this,Member.PUBLIC)}</tt>denies*accesstotheconstructor**<li>thecaller'sclassloaderisnotthesameasoran*ancestoroftheclassloaderforthecurrentclassand*invocationof<tt>{@linkSecurityManager#checkPackageAccess*s.checkPackageAccess()}</tt>deniesaccesstothepackage*ofthisclass**</ul>**@sinceJDK1.1*/publicConstructor<T>getConstructor(Class<?>...parameterTypes)throwsNoSuchMethodException,SecurityException{//beverycarefulnottochangethestackdepthofthis//checkMemberAccesscallforsecurityreasons//seejava.lang.SecurityManager.checkMemberAccesscheckMemberAccess(Member.PUBLIC,ClassLoader.getCallerClassLoader());returngetConstructor0(parameterTypes,Member.PUBLIC);}
解决方案五：
看下你的getConstructor方法，上楼有注释