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diff --git a/03_01_JMM.md b/03_01_JMM.md
index 985f918..e050159 100644
--- a/03_01_JMM.md
+++ b/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
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diff --git a/out/production/JVM/com/mashibing/jvm/c3_jmm/T04_Disorder$2.class b/out/production/JVM/com/mashibing/jvm/c3_jmm/T04_Disorder$2.class
deleted file mode 100644
index 2c96784..0000000
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diff --git a/out/production/JVM/com/mashibing/jvm/c3_jmm/T04_Disorder.class b/out/production/JVM/com/mashibing/jvm/c3_jmm/T04_Disorder.class
deleted file mode 100644
index ef262ec..0000000
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diff --git a/out/production/JVM/com/mashibing/jvm/c3_jmm/TestHeapDump.class b/out/production/JVM/com/mashibing/jvm/c3_jmm/TestHeapDump.class
deleted file mode 100644
index b572336..0000000
Binary files a/out/production/JVM/com/mashibing/jvm/c3_jmm/TestHeapDump.class and /dev/null differ
diff --git a/out/production/JVM/com/mashibing/jvm/c3_jmm/TestSync.class b/out/production/JVM/com/mashibing/jvm/c3_jmm/TestSync.class
deleted file mode 100644
index 0c1f60b..0000000
Binary files a/out/production/JVM/com/mashibing/jvm/c3_jmm/TestSync.class and /dev/null differ
diff --git a/out/production/JVM/com/mashibing/jvm/c3_jmm/TestVolatile.class b/out/production/JVM/com/mashibing/jvm/c3_jmm/TestVolatile.class
deleted file mode 100644
index 0930733..0000000
Binary files a/out/production/JVM/com/mashibing/jvm/c3_jmm/TestVolatile.class and /dev/null differ
diff --git a/out/production/JVM/com/mashibing/jvm/cms/Student.class b/out/production/JVM/com/mashibing/jvm/cms/Student.class
deleted file mode 100644
index 13620ce..0000000
Binary files a/out/production/JVM/com/mashibing/jvm/cms/Student.class and /dev/null differ
diff --git a/out/production/JVM/com/mashibing/jvm/cms/Test.class b/out/production/JVM/com/mashibing/jvm/cms/Test.class
deleted file mode 100644
index 0f73009..0000000
Binary files a/out/production/JVM/com/mashibing/jvm/cms/Test.class and /dev/null differ
diff --git a/src/com/mashibing/jvm/c2_classloader/T007_MSBClassLoaderWithEncription.java b/src/com/mashibing/jvm/c2_classloader/T007_MSBClassLoaderWithEncription.java
index 5ae8608..a9a4212 100644
--- a/src/com/mashibing/jvm/c2_classloader/T007_MSBClassLoaderWithEncription.java
+++ b/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;
diff --git a/src/com/mashibing/jvm/c2_classloader/T010_Parent.java b/src/com/mashibing/jvm/c2_classloader/T010_Parent.java
index a5eff2f..d04cd53 100644
--- a/src/com/mashibing/jvm/c2_classloader/T010_Parent.java
+++ b/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();
diff --git a/src/com/mashibing/jvm/c2_classloader/T011_ClassReloading1.java b/src/com/mashibing/jvm/c2_classloader/T011_ClassReloading1.java
index 9226f1f..7c4f758 100644
--- a/src/com/mashibing/jvm/c2_classloader/T011_ClassReloading1.java
+++ b/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();
diff --git a/src/com/mashibing/jvm/c2_classloader/T012_ClassReloading2.java b/src/com/mashibing/jvm/c2_classloader/T012_ClassReloading2.java
index aedc23c..c48ed99 100644
--- a/src/com/mashibing/jvm/c2_classloader/T012_ClassReloading2.java
+++ b/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();
+ }
}
diff --git a/src/com/mashibing/jvm/c3_jmm/T03_SizeOfAnObject.java b/src/com/mashibing/jvm/c3_jmm/T03_SizeOfAnObject.java
index 8a851c0..6be827a 100644
--- a/src/com/mashibing/jvm/c3_jmm/T03_SizeOfAnObject.java
+++ b/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