剔除idea相关的文件

03_01_JMM.md

@@ -11,6 +11,7 @@ https://www.cnblogs.com/z00377750/p/9180644.html
 现代CPU的数据一致性实现 = 缓存锁(MESI ...) + 总线锁
 
 读取缓存以cache line为基本单位，目前64bytes
+(缓存行可以想到内存对齐的问题，组成原理里的)
 
 位于同一缓存行的两个不同数据，被两个不同CPU锁定，产生互相影响的伪共享问题
 

src/com/mashibing/jvm/c2_classloader/T007_MSBClassLoaderWithEncription.java

@@ -7,6 +7,9 @@
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 
+/**
+ * 自定义classloader 并加密，防止别人反编译
+ */
 public class T007_MSBClassLoaderWithEncription extends ClassLoader {
 
     public static int seed = 0B10110110;

src/com/mashibing/jvm/c2_classloader/T010_Parent.java

@@ -1,5 +1,8 @@
 package com.mashibing.jvm.c2_classloader;
 
+/**
+ * 指定父classloader
+ */
 public class T010_Parent {
     private static T006_MSBClassLoader parent = new T006_MSBClassLoader();
 

src/com/mashibing/jvm/c2_classloader/T011_ClassReloading1.java

@@ -1,5 +1,8 @@
 package com.mashibing.jvm.c2_classloader;
 
+/**
+ * 本类并未破坏双亲委派
+ */
 public class T011_ClassReloading1 {
     public static void main(String[] args) throws Exception {
         T006_MSBClassLoader msbClassLoader = new T006_MSBClassLoader();

src/com/mashibing/jvm/c2_classloader/T012_ClassReloading2.java

@@ -1,20 +1,24 @@
 package com.mashibing.jvm.c2_classloader;
 
-import com.mashibing.jvm.Hello;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.URISyntaxException;
+import java.net.URL;
 
+/**
+ * 本类破坏了双亲委派模型
+ * 打破双亲委派，只能重写loadclass
+ */
 public class T012_ClassReloading2 {
     private static class MyLoader extends ClassLoader {
         @Override
         public Class<?> loadClass(String name) throws ClassNotFoundException {
-
-            File f = new File("C:/work/ijprojects/JVM/out/production/JVM/" + name.replace(".", "/").concat(".class"));
-
-            if(!f.exists()) return super.loadClass(name);
+            String filePath = getCurrentClassPath() + File.separator + name.replaceAll("\\.", File.separator).concat(".class");
+            File f = new File(filePath);
+            if (!f.exists()) return super.loadClass(name);
 
             try {
 
@@ -32,12 +36,24 @@ public Class<?> loadClass(String name) throws ClassNotFoundException {
     }
 
     public static void main(String[] args) throws Exception {
+        String name = "com.mashibing.jvm.Hello";
         MyLoader m = new MyLoader();
-        Class clazz = m.loadClass("com.mashibing.jvm.Hello");
+        Class clazz = m.loadClass(name);
 
         m = new MyLoader();
-        Class clazzNew = m.loadClass("com.mashibing.jvm.Hello");
+        Class clazzNew = m.loadClass(name);
 
         System.out.println(clazz == clazzNew);
     }
+
+    private static String getCurrentClassPath() {
+        URL url = T012_ClassReloading2.class.getClassLoader().getResource("");
+        File f = null;
+        try {
+            f = new File(url.toURI());
+        } catch (URISyntaxException e) {
+            e.printStackTrace();
+        }
+        return f.getPath();
+    }
 }

src/com/mashibing/jvm/c3_jmm/T03_SizeOfAnObject.java

@@ -1,12 +1,12 @@
 package com.mashibing.jvm.c3_jmm;
 
-import com.mashibing.jvm.agent.ObjectSizeAgent;
+//import com.mashibing.jvm.agent.ObjectSizeAgent;
 
 public class T03_SizeOfAnObject {
     public static void main(String[] args) {
-        System.out.println(ObjectSizeAgent.sizeOf(new Object()));
-        System.out.println(ObjectSizeAgent.sizeOf(new int[] {}));
-        System.out.println(ObjectSizeAgent.sizeOf(new P()));
+//        System.out.println(ObjectSizeAgent.sizeOf(new Object()));
+//        System.out.println(ObjectSizeAgent.sizeOf(new int[] {}));
+//        System.out.println(ObjectSizeAgent.sizeOf(new P()));
     }
 
     //一个Object占多少个字节