Scanner扫描器工具类

 1 public class GetData {
 2     private static Scanner scanner;
 3     static {
 4         scanner = new Scanner(System.in);
 5     }
 6 
 7     private GetData() {
 8     }
 9 
10     /**
11      * 返回String类型
12      * 
13      * @return
14      */
15     public static String getString() {
16         return scanner.nextLine();
17     }
18 
19     /**
20      * 返回Float类型，可能为null
21      * 
22      * @return
23      */
24     public static Float getFloat() {
25 
26         String string = scanner.nextLine();
27         Float f;
28         try {
29             f = Float.parseFloat(string);
30             return f;
31         } catch (NumberFormatException e) {
32             // TODO Auto-generated catch block
33             // e.printStackTrace();
34             return null;
35         }
36     }
37 
38     /**
39      * 获取Integer类型值。
40      * 
41      * @return
42      */
43     public static Integer getInteger() {
44         String string = scanner.nextLine();
45         Integer integer;
46         try {
47             integer = Integer.parseInt(string);
48             return integer;
49         } catch (NumberFormatException e) {
50             // e.printStackTrace();
51             return null;
52         }
53 
54     }
55 
56     /**
57      * 获取Double类型值。
58      * 
59      * @return
60      */
61     public static Double getDouble() {
62         String string = scanner.nextLine();
63         Double integer;
64         try {
65             integer = Double.parseDouble(string);
66             return integer;
67         } catch (NumberFormatException e) {
68             // e.printStackTrace();
69             return null;
70         }
71     }
72 
73     /**
74      * 关闭扫描器
75      */
76     public static void closeScanner() {
77         scanner.close();
78     }
79 }