今天在用VisualVM查看进程的堆dump时，发现一些有意思的地方，见下图：在“OQL控制台”页面中可以看到“过度分配的字符串”，“布尔值太多”。从这里，可以看到一些有意思的地方。有垃圾回收机制的语言通常有很多优化 1..String是不能改变的，所以subString通常是和原来的Stri...

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