IDEA查看类加载器加载类顺序

  • Z时代
  • 2024-01-10
  • 分类：综合

编程

在需要运行的类配置中添加该配置，运行时即可打印类加载明细

-verbose:class

源程序代码如下：

import com.sun.crypto.provider.DESKeyFactory;
public class ClassLoadTest1 {
    public static void main(String args[]) {
        // 启动类加载器，使用C++语言编写，负责加载支撑JVM运行的位于jre的lib目录下的核心类库
        System.out.println(String.class.getClassLoader());
        // 扩展类加载器，负责加载支撑JVM运行的位于jre的lib目录下ext扩展目录下的jar类包
        System.out.println(DESKeyFactory.class.getClassLoader().getClass().getName());
        // 应用程序加载器，负责加载classpath路径下的类包，主要是用户自己写的类
        System.out.println(ClassLoadTest1.class.getClassLoader().getClass().getName());
        // 应用程序加载器
        System.out.println(ClassLoader.getSystemClassLoader().getClass().getName());
        // 自定义加载器，负责加载用户自定义路径下的类包
        System.out.println("方法内引用类加载1=======");
        A a = new A();
        System.out.println("方法内引用类加载2=======");
        B b = null;
        System.out.println("方法内引用类加载3=======");
    }
}
class A {
}
class B {
}

添加之后运行main方法，控制台打印日志如下：

[Opened C:Program FilesJava8jrelibt.jar]
[Loaded java.lang.Object from C:Program FilesJava8jrelibt.jar]
......// 省略一大批日志
[Loaded sun.launcher.LauncherHelper$FXHelper from C:Program FilesJava8jrelibt.jar]
[Loaded sun.nio.cs.US_ASCII$Decoder from C:Program FilesJava8jrelibt.jar]
[Loaded java.lang.Class$MethodArray from C:Program FilesJava8jrelibt.jar]
[Loaded java.lang.Void from C:Program FilesJava8jrelibt.jar]
null
[Loaded sun.security.util.ManifestDigester from C:Program FilesJava8jrelibt.jar]
[Loaded sun.security.util.ManifestDigester$Position from C:Program FilesJava8jrelibt.jar]
[Loaded sun.security.util.ManifestDigester$Entry from C:Program FilesJava8jrelibt.jar]
......// 省略一大批日志
[Loaded sun.security.util.ManifestEntryVerifier$SunProviderHolder from C:Program FilesJava8jrelibt.jar]
[Loaded javax.crypto.SecretKeyFactorySpi from C:Program FilesJava8jrelibjce.jar]
[Loaded com.sun.crypto.provider.DESKeyFactory from file:/C:/Program%20Files/Java8/jre/lib/ext/sunjce_provider.jar]
sun.misc.Launcher$ExtClassLoader
sun.misc.Launcher$AppClassLoader
sun.misc.Launcher$AppClassLoader
方法内引用类加载1=======
[Loaded classLoad.A from file:/E:/MyLearn/out/production/JavaVitualMachine/]
方法内引用类加载2=======
方法内引用类加载3=======
[Loaded java.lang.Shutdown from C:Program FilesJava8jrelibt.jar]
[Loaded java.lang.Shutdown$Lock from C:Program FilesJava8jrelibt.jar]
Process finished with exit code 0

 

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