java中List、Array、Map、Set等集合相互轉(zhuǎn)換
在java中，我們經(jīng)常需要對List、Array等做一些轉(zhuǎn)換操作，當然轉(zhuǎn)換方法有很多種，但哪種方法既方便又高效呢？在這里向大家介紹一下集合間的最佳轉(zhuǎn)換方法。
1.List轉(zhuǎn)換為Array
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List<String> list = new ArrayList<String>(); list.add("China"); list.add("Switzerland"); list.add("Italy"); list.add("France"); String [] countries = list.toArray(new String[list.size()]); |
2.Array轉(zhuǎn)換為List
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String[] countries = {"China", "Switzerland", "Italy", "France"}; List list = Arrays.asList(countries); |
3.Map轉(zhuǎn)換為List
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List<Value> list = new ArrayList<Value>(map.values()); |
4.Array轉(zhuǎn)換為Set
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String [] countries = {"India", "Switzerland", "Italy"}; Set<String> set = new HashSet<String>(Arrays.asList(countries)); System.out.println(set); |
5.Map轉(zhuǎn)換為Set
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Map<Integer, String> sourceMap = createMap(); Set<String> targetSet = new HashSet<>(sourceMap.values()); |
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原文鏈接：http://blog.csdn.net/suifeng3051/article/details/41699033
