代码如下:
String[] arr = {"a","b","c","d"};
// 数组转list
List<String> list = Arrays.asList(arr);
System.out.println("数组转list=" + list.toString());
// 数组转set
Set set = new HashSet(Arrays.asList(arr));
System.out.println("数组转set=" + set.toString());
// list转set
Set set2 = new HashSet(list);
System.out.println("list转set=" + set2.toString());
// list转数组
Object[] array = list.toArray();
System.out.println("list转数组=" + array.toString());
// set转list
List<String> list2 = new ArrayList<>(set2);
System.out.println("set转list=" + list2.toString());
// set转数组
Object[] array2 = set2.toArray();
System.out.println("set转数组=" + array2.toString());
结果:
提示:Object类型数组不能直接强转成String类型。