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	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#堆空间参数设置
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#常用参数设置
https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html	https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#空间分配担保
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#堆是分配对象的唯一选择么
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#逃逸分析
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#代码优化
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#栈上分配
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#同步省略同步消除
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#标量替换
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#逃逸分析的不足
	https://github.com/shihoney/JavaYouth/blob/main/docs/JVM/JVM系列-第5章-堆.md#小结
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