java中多种方法实现数组转list，数组转set

1. 数组->list 1.1 Arrays.asList()

tips: 该方法返回的是基于数组的List视图（List view）。对Arrays.asList()返回的List进行添加、删除操作会报错，可以使用set(修改)方法

String[] strArray = {"isy", "mi", "ka", "sa"};
List strList = Arrays.asList(strArray);

System.out.println(strList);
//strArray: [isy, mi, ka, sa]

1.2 Collections.addAll()

tips: 该方法实际上是将数组的内容复制到ArrayList中

List strList = new ArrayList();
String[] strArray = {"isy", "mi", "ka", "sa"};
Collections.addAll(strList, assstrArrayet);

System.out.println(strList);
//strArray: [isy, mi, ka, sa]

1.3 Java 8 新特性 1.3.1.Stream.of()

String[] strArray = {"isy", "mi", "ka", "sa"};
List strList = Stream.of(strArray).collect(Collectors.toList());

System.out.println(strList);
//strArray: [isy, mi, ka, sa]

1.3.2 将数组转为stream (可以做更灵活的其他操作)

String[] strArray = {"isy", "mi", "ka", "sa"};
List strList = Arrays.stream(strArray).collect(Collectors.toList());

System.out.println(strList);
//strArray: [isy, mi, ka, sa]

2. list->数组

list.toArray()

3. 数组->set 3.1. Arrays.asList()

String[] strArray = {"isy", "mi", "ka", "sa", "sa"};
Set strSet = new HashSet<>(Arrays.asList(strArray));

System.out.println(strSet);
//strSet: [isy, mi, ka, sa]

3.2. Collections.addAll()

tips: 该方法实际上是将数组的内容复制到set中

Set strSet = new HashSet();
String[] strArray = {"isy", "mi", "ka", "sa", "sa"};
Collections.addAll(strSet, strArray);

System.out.println(strSet);
//strSet: [isy, mi, ka, sa]

3.3. Java 8 新特性 3.3.1 将数组转为stream (可以做更灵活的其他操作)

String[] strArray = {"isy", "mi", "ka", "sa", "sa"};
Set strSet = Arrays.stream(strArray).collect(Collectors.toSet());

System.out.println(strSet);
//strSet: [isy, mi, ka, sa]

3.4. Java 9 新特性 3.4.1 前提：不可修改

String[] strArray = {"isy", "mi", "ka", "sa", "sa"};
Set mySet = Set.of(strArray);

System.out.println(strSet);
//strSet: [isy, mi, ka, sa]

老是完，整理记录一下