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JVM

2021-04-18 22:32:55   18  举报





JAVA虚拟机

java面试

运行时数据区

jvm内存模型

JVM

作者其他创作

大纲/内容

Compiled from \"JvmTest.java\"public class com.zyq.nat.controller.JvmTest { public com.zyq.nat.controller.JvmTest(); Code: 0: aload_0 1: invokespecial #1 // Method java/lang/Object.\"<init>\":()V 4: return public static void main(java.lang.String[]); Code: 0: new #2 // class com/zyq/nat/controller/JvmTest 3: dup 4: invokespecial #3 // Method \"<init>\":()V 7: astore_1 8: aload_1 9: invokevirtual #4 // Method compute:()I 12: pop 13: return public int compute(); Code: 0: iconst_1 1: istore_1 2: iconst_2 3: istore_2 4: iload_1 5: iload_2 6: iadd 7: bipush 10 9: imul 10: istore_3 11: iload_3 12: ireturn}

局部变量表

JvmTest.class

b = 2

JvmTest()

堆

程序计数器

user

Survivor区(幸存区)

s1(1/10)

man()-栈帧

out 30in 30out 3out 10in 10in 3out 1out 2in 2in 1

年轻代（1/3)

修改

javac

栈

动态链接

老年代（2/3)

对象存进Eden font color=\"#cc0000\

JvmTest.class

jvmTest

方法区（元空间）常量+静态变量+类信息

public class JvmTest { public static final int initData = 666; public static User user = new User(); public static void main(String[] args) { JvmTest jvmTest = new JvmTest(); jvmTest.compute(); } public int compute(){ int a = 1; int b = 2; int c = (a + b) * 10; return c; }}

执行

方法出口

操作数栈

本地方法栈

线程2

栈（线程)

User()

垃圾搜集线程（可达性分析算法）

JvmTest .java

Eden(8/10)

s0(1/10)

FILO