如果想針對陣列進行排序，可以使用
java.util.Arrays的sort()方法，如果你查詢API文件，會發現該方法針對物件排序時有兩個版本，一個是你收集在陣列中的物件必須是Comparable（否則會拋出ClassCastException），另一個版本則可以傳入Comparator指定排序方式。https://openhome.cc/Gossip/Java/ComparableComparator.html
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