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View Compilation Error

0_0_9424754_30409\Main.java:3: 找不到符号
符号: 类 Scanner
位置: 类 Main
Scanner in = new Scanner(System.in);int a, sum = 0;while (in.hasNext()) {a = in.nextInt();for (int i = 1; i <= a; i++) sum += i;System.out.println(sum);System.out.println("");sum = 0;}}}
^
0_0_9424754_30409\Main.java:3: 找不到符号
符号: 类 Scanner
位置: 类 Main
Scanner in = new Scanner(System.in);int a, sum = 0;while (in.hasNext()) {a = in.nextInt();for (int i = 1; i <= a; i++) sum += i;System.out.println(sum);System.out.println("");sum = 0;}}}
                 ^
2 错误


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