JDK11和JDK8类加载器的区别

如下代码：

public class Test07 {
    public static void main(String[] args) throws ClassNotFoundException {
        // 获取系统类加载器
        ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
        System.out.println(systemClassLoader);
        // 获取系统类加载器的父类加载器 --> 扩展类加载器
        ClassLoader parent = systemClassLoader.getParent();
        System.out.println(parent);
        // 获取扩展类加载器的父类加载器 --> 根加载器（C/C++）
        ClassLoader parent1 = parent.getParent();
        System.out.println(parent1);
        // 测试当前类的加载器
        ClassLoader classLoader = Class.forName("com.itteer.reflection.Test07").getClassLoader();
        System.out.println(classLoader);
        // 测试JDK内置的类加载器
        classLoader = Class.forName("java.lang.Object").getClassLoader();
        System.out.println(classLoader);
        // 如何获得系统类加载器可以加载的路径
        System.out.println(System.getProperty("java.class.path"));
    }
}

使用JDK11编译，输出结果如下：

jdk.internal.loader.ClassLoaders$AppClassLoader@1f89ab83
jdk.internal.loader.ClassLoaders$PlatformClassLoader@7c30a502
null
jdk.internal.loader.ClassLoaders$AppClassLoader@1f89ab83
null
D:IDEAWorkspacedemoanno

使用JDK8编译，输出结果如下：

sun.misc.Launcher$AppClassLoader@18b4aac2
sun.misc.Launcher$ExtClassLoader@1b6d3586
null
sun.misc.Launcher$AppClassLoader@18b4aac2
null
D:Javajdk1.8.0jrelibcharsets.jar;
D:Javajdk1.8.0jrelibdeploy.jar;
D:Javajdk1.8.0jrelibextaccess-bridge-64.jar;
D:Javajdk1.8.0jrelibextcldrdata.jar;
D:Javajdk1.8.0jrelibextdnsns.jar;
D:Javajdk1.8.0jrelibextjaccess.jar;
D:Javajdk1.8.0jrelibextjfxrt.jar;
D:Javajdk1.8.0jrelibextlocaledata.jar;
D:Javajdk1.8.0jrelibext
ashorn.jar;
D:Javajdk1.8.0jrelibextsunec.jar;
D:Javajdk1.8.0jrelibextsunjce_provider.jar;
D:Javajdk1.8.0jrelibextsunmscapi.jar;
D:Javajdk1.8.0jrelibextsunpkcs11.jar;
D:Javajdk1.8.0jrelibextzipfs.jar;
D:Javajdk1.8.0jrelibjavaws.jar;
D:Javajdk1.8.0jrelibjce.jar;
D:Javajdk1.8.0jrelibjfr.jar;
D:Javajdk1.8.0jrelibjfxswt.jar;
D:Javajdk1.8.0jrelibjsse.jar;
D:Javajdk1.8.0jrelibmanagement-agent.jar;
D:Javajdk1.8.0jrelibplugin.jar;
D:Javajdk1.8.0jrelib
esources.jar;
D:Javajdk1.8.0jrelib
t.jar;
D:IDEAWorkspacedemoanno;
C:Program FilesJetBrainsIntelliJ IDEA 2019.3.1libidea_rt.jar