方法区

超、凢脫俗 2023-02-09 14:10 10阅读 0赞

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static int count = 1; --类加载器时，进行初始化处理时，才赋值为1  
static int final int number = 2; --编译时（javac，编译成字节码文件时），就确定值为2了  
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\-方法区是线程共享的  
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**方法区内存溢出**

*  1.8 以前会导致永久代内存溢出  
    演示永久代内存溢出 java.lang.OutOfMemoryError: PermGen space \* -XX:MaxPermSize=8m
 *  1.8 之后会导致元空间内存溢出  
    \-演示元空间内存溢出 java.lang.OutOfMemoryError: Metaspace \* -XX:MaxMetaspaceSize=8m
 *  场景  
    spring和 mybatis  
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    **运行时常量池**
 *  常量池，就是一张表，虚拟机指令根据这张常量表找到要执行的类名、方法名、参数类型、字面量 等信息
 *  运行时常量池，常量池是 \*.class 文件中的，当该类被加载，它的常量池信息就会放入运行时常量 池，并把里面的符号地址变为真实地址

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