View Compilation Error

0_0_19404350_20713\Main.java:1: 错误: 需要class, interface或enum
    public String isNumber(int m, int n) {
           ^
0_0_19404350_20713\Main.java:3: 错误: 需要class, interface或enum
        for (int i=m; i<=n; i++) {
        ^
0_0_19404350_20713\Main.java:3: 错误: 需要class, interface或enum
        for (int i=m; i<=n; i++) {
                      ^
0_0_19404350_20713\Main.java:3: 错误: 需要class, interface或enum
        for (int i=m; i<=n; i++) {
                            ^
0_0_19404350_20713\Main.java:5: 错误: 需要class, interface或enum
            int b = (i/10) %10;
            ^
0_0_19404350_20713\Main.java:6: 错误: 需要class, interface或enum
            int c = i%10;
            ^
0_0_19404350_20713\Main.java:7: 错误: 需要class, interface或enum
            if (a*a*a+b*b*b+c*c*c == i) {
            ^
0_0_19404350_20713\Main.java:9: 错误: 需要class, interface或enum
            }
            ^
0_0_19404350_20713\Main.java:12: 错误: 需要class, interface或enum
    }
    ^
9 个错误