数组，List，Set相互转化

1.数组转化为List：
String[] strArray= new String[]{"Tom", "Bob", "Jane"};

List strList= Arrays.asList(strArray);

2.数组转Set
String[] strArray= new String[]{"Tom", "Bob", "Jane"};

Set staffsSet = new HashSet<>(Arrays.asList(staffs));

staffsSet.add("Mary"); // ok

staffsSet.remove("Tom"); // ok

3.List转Set
String[] staffs = new String[]{"Tom", "Bob", "Jane"};

List staffsList = Arrays.asList(staffs);

Set result = new HashSet(staffsList);

4.set转List
String[] staffs = new String[]{"Tom", "Bob", "Jane"};

Set staffsSet = new HashSet<>(Arrays.asList(staffs));

List result = new ArrayList<>(staffsSet);