ag亚洲游戏集团下载【网.址_yk490.COM】ag亚洲游戏集团下载【网.址_yk490.COM】ag亚洲游戏集团下载【网.址_yk490.COM】红色的方法对应的jdk源码 /* Returns a {@code Constructor} object that reflects the specified

 * constructor of the class or interface represented by this
 * {@code Class} object.  The {@code parameterTypes} parameter is
 * an array of {@code Class} objects that identify the constructor's
 * formal parameter types, in declared order.
 *
 * If this {@code Class} object represents an inner class
 * declared in a non-static context, the formal parameter types
 * include the explicit enclosing instance as the first parameter.
 *
 * @param parameterTypes the parameter array
 * @return The {@code Constructor} object for the constructor with the
 *          specified parameter list
 * @throws NoSuchMethodException if a matching method is not found.
 * @throws SecurityException
 *          If a security manager, s, is present and any of the
 *          following conditions is met:
 *
 *          
 *
 *           the caller's class loader is not the same as the
 *          class loader of this class and invocation of
 *          {@link SecurityManager#checkPermission
 *          s.checkPermission} method with
 *          {@code RuntimePermission("accessDeclaredMembers")}
 *          denies access to the declared constructor
 *
 *          
 the caller's class loader is not the same as or an
 *          ancestor of the class loader for the current class and
 *          invocation of {@link SecurityManager#checkPackageAccess
 *          s.checkPackageAccess()} denies access to the package
 *          of this class
 *
 *          
 *
 * @since JDK1.1 */ @CallerSensitive public Constructor getDeclaredConstructor(Class... parameterTypes) throws NoSuchMethodException, SecurityException {
    checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); return getConstructor0(parameterTypes, Member.DECLARED);
}

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其实就是获取当前的这个Person类的默认的构造函数，了解的差不多就行了，别逮到一个类就往死点jdk 深入是深入了出不来不是白给么？

下面这个图片就是借花献佛以下，下面也说了 newInsrtance（）就是实例化对象用的

类装载器 CLassLoader

懒得打字直接看图

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类装载找类字节，虚机建类象组件
类加载装虚机中，需要通过下几步

查找导入类文件，校验准备和解析
校验类文件数据，是否准确不掺假
准备阶段很关键，要给静态配空间
解析阶段可以选，符号引用变直引

初始化阶段不拉胯，静态系列初始化
　　　　　　　　　　　　JVM

ClassLoader　　　　　　ExtClassLoader　　　　AppClassLoader

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ClassLoader loader = Thread.currentThread().getContextClassLoader();

    System.out.println("current Loader" + loader);
    System.out.println("baba Loader" + loader.getParent());
    System.out.println("yeye Loader" + loader.getParent().getParent());

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"C:Program FilesJavajdk1.8.0_152binjava.exe" "-javaagent:E:ideaIntelliJ IDEA 2020.2.4libidea_rt.jar=57015:E:ideaIntelliJ IDEA 2020.2.4bin" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_152jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_152jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_152jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_152jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_152jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_152jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_152jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_152jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_152jrelibextnashorn.jar;C:Program FilesJavajdk1.8.0_152jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_152jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_152jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_152jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_152jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_152jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_152jrelibjce.jar;C:Program FilesJavajdk1.8.0_152jrelibjfr.jar;C:Program FilesJavajdk1.8.0_152jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_152jrelibjsse.jar;C:Program FilesJavajdk1.8.0_152jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_152jrelibplugin.jar;C:Program FilesJavajdk1.8.0_152jrelibresources.jar;C:Program FilesJavajdk1.8.0_152jrelibrt.jar;C:UsersAdministratorDesktopspring4.xwangpanchapter3targetclasses;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-starter-web1.3.3.RELEASEspring-boot-starter-web-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-starter1.3.3.RELEASEspring-boot-starter-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot1.3.3.RELEASEspring-boot-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-autoconfigure1.3.3.RELEASEspring-boot-autoconfigure-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-starter-logging1.3.3.RELEASEspring-boot-starter-logging-1.3.3.RELEASE.jar;D:ToolsForDevrepositorychqoslogbacklogback-classic1.1.5logback-classic-1.1.5.jar;D:ToolsForDevrepositorychqoslogbacklogback-core1.1.5logback-core-1.1.5.jar;D:ToolsForDevrepositoryorgslf4jslf4j-api1.7.16slf4j-api-1.7.16.jar;D:ToolsForDevrepositoryorgslf4jjcl-over-slf4j1.7.16jcl-over-slf4j-1.7.16.jar;D:ToolsForDevrepositoryorgslf4jjul-to-slf4j1.7.16jul-to-slf4j-1.7.16.jar;D:ToolsForDevrepositoryorgslf4jlog4j-over-slf4j1.7.16log4j-over-slf4j-1.7.16.jar;D:ToolsForDevrepositoryorgyamlsnakeyaml1.16snakeyaml-1.16.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-starter-tomcat1.3.3.RELEASEspring-boot-starter-tomcat-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorgapachetomcatembedtomcat-embed-logging-juli8.0.32tomcat-embed-logging-juli-8.0.32.jar;D:ToolsForDevrepositoryorgapachetomcatembedtomcat-embed-websocket8.0.32tomcat-embed-websocket-8.0.32.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-starter-validation1.3.3.RELEASEspring-boot-starter-validation-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorghibernatehibernate-validator5.2.4.Finalhibernate-validator-5.2.4.Final.jar;D:ToolsForDevrepositoryjavaxvalidationvalidation-api1.1.0.Finalvalidation-api-1.1.0.Final.jar;D:ToolsForDevrepositoryorgjbossloggingjboss-logging3.3.0.Finaljboss-logging-3.3.0.Final.jar;D:ToolsForDevrepositorycomfasterxmlclassmate1.1.0classmate-1.1.0.jar;D:ToolsForDevrepositorycomfasterxmljacksoncorejackson-databind2.6.5jackson-databind-2.6.5.jar;D:ToolsForDevrepositorycomfasterxmljacksoncorejackson-annotations2.6.5jackson-annotations-2.6.5.jar;D:ToolsForDevrepositorycomfasterxmljacksoncorejackson-core2.6.5jackson-core-2.6.5.jar;D:ToolsForDevrepositoryorgspringframeworkspring-web4.2.5.RELEASEspring-web-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkspring-aop4.2.5.RELEASEspring-aop-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryaopallianceaopalliance1.0aopalliance-1.0.jar;D:ToolsForDevrepositoryorgspringframeworkspring-beans4.2.5.RELEASEspring-beans-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkspring-context4.2.5.RELEASEspring-context-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkspring-webmvc4.2.5.RELEASEspring-webmvc-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkspring-expression4.2.5.RELEASEspring-expression-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-starter-jdbc1.3.3.RELEASEspring-boot-starter-jdbc-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorgapachetomcattomcat-jdbc8.0.32tomcat-jdbc-8.0.32.jar;D:ToolsForDevrepositoryorgapachetomcattomcat-juli8.0.32tomcat-juli-8.0.32.jar;D:ToolsForDevrepositoryorgspringframeworkspring-jdbc4.2.5.RELEASEspring-jdbc-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkspring-tx4.2.5.RELEASEspring-tx-4.2.5.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-starter-actuator1.3.3.RELEASEspring-boot-starter-actuator-1.3.3.RELEASE.jar;D:ToolsForDevrepositoryorgspringframeworkbootspring-boot-actuator1.3.3.RELEASEspring-boot-actuator-1.3.3.RELEASE.jar;D:ToolsForDevrepositorymysqlmysql-connector-java5.1.38mysql-connector-java-5.1.38.jar;D:ToolsForDevrepositoryorgapachetomcatembedtomcat-embed-core8.0.32tomcat-embed-core-8.0.32.jar;D:ToolsForDevrepositoryorgapachetomcatembedtomcat-embed-el8.0.32tomcat-embed-el-8.0.32.jar;D:ToolsForDevrepositoryjavaxservletjstl1.2jstl-1.2.jar;D:ToolsForDevrepositoryorgspringframeworkspring-core4.2.5.RELEASEspring-core-4.2.5.RELEASE.jar" com.smart.reflect.ReflectTest
name:兔宝宝; nipples:pink;hight:170
当前加载器
current Loadersun.misc.Launcher$AppClassLoader@18b4aac2
当前加载器的爹
baba Loadersun.misc.Launcher$ExtClassLoader@33c7353a
当前加载器的爷爷
yeye Loadernull

Process finished with exit code 0

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这个费点劲还得启动
用这个省事

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package com.smart.utils; import java.io.File; import java.net.MalformedURLException; import java.net.URL; import java.security.CodeSource; import java.security.ProtectionDomain; /* tools to find which jar does the class come from

@author : chenxh
@date: 16-04-0 */

public class ClassLocationUtils { /* find the location of the class come from

 * @param cls
 * @return
 */
public static String where(final Class cls) { if (cls == null)throw new IllegalArgumentException("null input: cls");
    URL result = null; final String clsAsResource = cls.getName().replace('.', '/').concat(".class"); final ProtectionDomain pd = cls.getProtectionDomain(); if (pd != null) { final CodeSource cs = pd.getCodeSource(); if (cs != null) result = cs.getLocation(); if (result != null) { if ("file".equals(result.getProtocol())) { try { if (result.toExternalForm().endsWith(".jar") || result.toExternalForm().endsWith(".zip"))
                        result = new URL("jar:".concat(result.toExternalForm())
                                .concat("!/").concat(clsAsResource)); else if (new File(result.getFile()).isDirectory())
                        result = new URL(result, clsAsResource);
                } catch (MalformedURLException ignore) {}
            }
        }
    } if (result == null) { final ClassLoader clsLoader = cls.getClassLoader();
        result = clsLoader != null ? clsLoader.getResource(clsAsResource) :
                ClassLoader.getSystemResource(clsAsResource);
    } return result.toString();
}

}

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自己试了一下嘿您猜怎么着还真好使

file:/C:/Users/Administrator/Desktop/spring4.x/wangpan/chapter3/target/classes/com/smart/reflect/Person.class

ag亚洲游戏集团下载

类装载器 CLassLoader

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