java类加载器的分类

package com.volcano.reflection;

public class TestReflection4 {

    public static void main(String[] args) {

        //获取系统类加载器

        ClassLoader classLoader = ClassLoader.getSystemClassLoader();

        System.out.println(classLoader);

        //获取拓展类加载器

        classLoader = classLoader.getParent();

        System.out.println(classLoader);

        //获取引导类加载器(是直接无法获取的)

        classLoader = classLoader.getParent();

        System.out.println(classLoader);

        //测试当前类是由哪个类加载器加载的——引导类加载器

        System.out.println(TestReflection4.class.getClassLoader());

        //测试JDK内置的类是由哪个类加载器加载的——系统类加载器null

        System.out.println(Object.class.getClassLoader());

        //如何获得系统类加载器的加载的类的路径

        System.out.println(System.getProperty("java.class.path"));

        /*之前用过的commons-io和自己写的类也在其中

        * E:\JDK\jre\lib\charsets.jar;

        * E:\JDK\jre\lib\deploy.jar;

        * E:\JDK\jre\lib\ext\access-bridge-64.jar;

        * E:\JDK\jre\lib\ext\cldrdata.jar;

        * E:\JDK\jre\lib\ext\dnsns.jar;

        * E:\JDK\jre\lib\ext\jaccess.jar;

        * E:\JDK\jre\lib\ext\jfxrt.jar;

        * E:\JDK\jre\lib\ext\localedata.jar;

        * E:\JDK\jre\lib\ext\nashorn

        * .jar;E:\JDK\jre\lib\ext\sunec.jar;

        * E:\JDK\jre\lib\ext\sunjce_provider.jar;

        * E:\JDK\jre\lib\ext\sunmscapi.jar;

        * E:\JDK\jre\lib\ext\sunpkcs11

        * .jar;E:\JDK\jre\lib\ext\zipfs.jar;

        * E:\JDK\jre\lib\javaws.jar;

        * E:\JDK\jre\lib\jce.jar;

        * E:\JDK\jre\lib\jfr.jar;

        * E:\JDK\jre\lib\jfxswt.jar;

        * E:\JDK\jre\lib\jsse.jar;

        * E:\JDK\jre\lib\management-agent.jar;

        * E:\JDK\jre\lib\plugin.jar;

        * E:\JDK\jre\lib\resources.jar;

        * E:\JDK\jre\lib\rt.jar;

        * F:\云\Code\JavaSE\out\production\基础语法;

        * F:\云\Code\JavaSE\基础语法\src\com\lib\commons-io-2.6.jar;

        * D:\IntelliJ IDEA 2018.2.4\lib\idea_rt.jar

         * */

    }

}