View Compilation Error

0_0_37916339_1571\Main.java:1: 错误: 需要class, interface或enum
Scanner sc = new Scanner(System.in);
^
0_0_37916339_1571\Main.java:2: 错误: 需要class, interface或enum
String str = sc.nextLine();
^
0_0_37916339_1571\Main.java:3: 错误: 需要class, interface或enum
char[] chars = str.toCharArray();
^
0_0_37916339_1571\Main.java:4: 错误: 需要class, interface或enum
Arrays.sort(chars);
^
0_0_37916339_1571\Main.java:5: 错误: 需要class, interface或enum
System.out.println(new String(chars));
^
5 个错误