View Compilation Error

0_0_24438561_14678\Main.java:20: 错误: 需要')'
System*out.println(a.toString() + n n + b.toString());
                                   ^
0_0_24438561_14678\Main.java:20: 错误: 不是语句
System*out.println(a.toString() + n n + b.toString());
      ^
0_0_24438561_14678\Main.java:20: 错误: 不是语句
System*out.println(a.toString() + n n + b.toString());
                                      ^
0_0_24438561_14678\Main.java:20: 错误: 需要';'
System*out.println(a.toString() + n n + b.toString());
                                                    ^
0_0_24438561_14678\Main.java:21: 错误: 解析时已到达文件结尾
cin.close();}} 
              ^
5 个错误