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Update memory-area.md

修正缺少的字

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Original file line number	Diff line number	Diff line change
`@@ -252,7 +252,7 @@ System.out.println(aa==bb); // true`
`252`	`252`
`253`	`253`	HotSpot 虚拟机中字符串常量池的实现是 `src/hotspot/share/classfile/stringTable.cpp` ,`StringTable` 可以简单理解为一个固定大小的`HashTable` ,容量为 `StringTableSize`(可以通过 `-XX:StringTableSize` 参数来设置),保存的是字符串(key)和字符串对象的引用(value)的映射关系,字符串对象的引用指向堆中的字符串对象。
`254`	`254`
`255`		`-JDK1.7 之前,字符串常量池存放在永久代。JDK1.7 字符串常量池和静态变量从永久代移动了 Java 堆中。`
	`255`	`+JDK1.7 之前,字符串常量池存放在永久代。JDK1.7 字符串常量池和静态变量从永久代移动到了 Java 堆中。`
`256`	`256`
`257`	`257`	`![method-area-jdk1.6](https://oss.javaguide.cn/github/javaguide/java/jvm/method-area-jdk1.6.png)`
`258`	`258`

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