1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
| package frame.file.office;
|
| import org.apache.log4j.Logger;
|
| public class Engine {
|
| private static Engine instance;
| private static Object locker = new Object();
| private Logger logger;
| private ExcelLoader excelLoader;
|
|
| private Engine() {
| logger = new Logger();
| excelLoader = new ExcelLoader(logger);
|
| }
|
| public static Engine getInstance() {
| lock (locker) {
| if (instance == null) {
| instance = new Engine();
| }
|
| return instance;
| }
| }
|
| }
|
|
