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View Compilation Error

0_0_7752992_11470\Main.java:1: 需要为 class、interface 或 enum
  public static void main(String[] args) {
                ^
0_0_7752992_11470\Main.java:3: 需要为 class、interface 或 enum
        while ( scanner.hasNext() )
        ^
0_0_7752992_11470\Main.java:6: 需要为 class、interface 或 enum
            System.out.println(a+b);   
            ^
0_0_7752992_11470\Main.java:8: 需要为 class、interface 或 enum
        }
        ^
4 错误


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