From: https://www.cnblogs.com/yysbolg/p/9977365.html

數組轉List

String[] staffs = new String[]{"A", "B", "C"}; List staffsList = Arrays.asList(staffs);//注意: Arrays.asList() 返回一個受指定數組決定的固定大小的列表。所以不能做 add 、 remove 等操作，否則會報錯。List staffsList = Arrays.asList(staffs); staffsList.add("D"); // UnsupportedOperationException staffsList.remove(0); // UnsupportedOperationException//一下方式可以進行增刪操作。List staffsList = new ArrayList<String>(); for(String temp: staffs){staffsList.add(temp); } staffsList.add("D"); // ok staffsList.remove(0); // ok

數組轉Set

String[] staffs = new String[]{"A", "B", "C"}; Set<String> staffsSet = new HashSet<>(Arrays.asList(staffs)); staffsSet.add("D"); // ok staffsSet.remove("Tom"); // ok

List轉數組

?

String[] staffs = new String[]{"A", "B", "C"}; List staffsList = Arrays.asList(staffs);Object[] result = staffsList.toArray();

List轉Set

String[] staffs = new String[]{"A", "B", "C"}; List staffsList = Arrays.asList(staffs);Set result = new HashSet(staffsList);

Set轉數組

?

String[] staffs = new String[]{"A", "B", "C"}; Set<String> staffsSet = new HashSet<>(Arrays.asList(staffs));Object[] result = staffsSet.toArray();

Set轉List

String[] staffs = new String[]{"A", "B", "C"}; Set<String> staffsSet = new HashSet<>(Arrays.asList(staffs));List<String> result = new ArrayList<>(staffsSet);

總結

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