View Compilation Error

0_0_35821365_2759\Main.java:12: 错误: 不兼容的类型: String无法转换为char
			S[mid][mid] = a;
			              ^
0_0_35821365_2759\Main.java:17: 错误: 不兼容的类型: String无法转换为char
						S[mid - i][mid - i + j] = b;
						                          ^
0_0_35821365_2759\Main.java:18: 错误: 不兼容的类型: String无法转换为char
						S[mid + i][mid - i + j] = b;
						                          ^
0_0_35821365_2759\Main.java:19: 错误: 不兼容的类型: String无法转换为char
						S[mid - i + j][mid - i] = b;
						                          ^
0_0_35821365_2759\Main.java:20: 错误: 不兼容的类型: String无法转换为char
						S[mid - i + j][mid + i] = b;
						                          ^
0_0_35821365_2759\Main.java:25: 错误: 不兼容的类型: String无法转换为char
						S[mid - i][mid - i + j] = a;
						                          ^
0_0_35821365_2759\Main.java:26: 错误: 不兼容的类型: String无法转换为char
						S[mid + i][mid - i + j] = a;
						                          ^
0_0_35821365_2759\Main.java:27: 错误: 不兼容的类型: String无法转换为char
						S[mid - i + j][mid - i] = a;
						                          ^
0_0_35821365_2759\Main.java:28: 错误: 不兼容的类型: String无法转换为char
						S[mid - i + j][mid + i] = a;
						                          ^
9 个错误