The -H option dereferences links on the command line and the -L option dereferences those plus links that are part of the display.
H 选项取消引用命令行上的链接，而 -L 选项取消引用属于显示内容一部分的附加链接。
2
Without the theFlooble reference being volatile, the code in doWork() would be at risk for seeing a partially constructed Flooble as it dereferences the theFlooble reference.