1 public class Align {
 2     public static void main(String[] args) {
 3         System.out.println("默认输出方式");
 4         System.out.println(leftAlign("半角转全角左对齐",20,‘-‘));
 5         System.out.println(rightAlign("半角转全角右对齐",20,‘-‘));
 6         System.out.println(quanToban(leftAlign("全角转半角左对齐",20,‘-‘)));
 7         System.out.println(quanToban(rightAlign("全角转半角右对齐",20,‘-‘)));
 8     }
 9     //左对齐，半角转全角（原串、希望域宽、填充字符）
10     public static String leftAlign(String str, int len,char c) {
11         char array[] = str.toCharArray();
12         for (int i = 0; i < array.length; i++) {//半角转全角
13             if (array[i] == ‘ ‘) {
14                 array[i] = ‘\u3000‘;
15             } else if (array[i] < ‘\177‘) {
16                 array[i] = (char) (array[i] + 65248);
17             }
18         }
19         int sub = len - str.length();
20         if (sub <= 0) {
21             return new String(array);//大于等于len返回
22         }
23         char[] temp = new char[len];
24         System.arraycopy(array, 0, temp, 0, str.length());
25         for (int j = str.length();j < len; j++) {//左对齐右填充
26             if (c == ‘ ‘) {
27                 temp[j] = ‘\u3000‘;
28             } else if (c < ‘\177‘) {
29                 temp[j] = (char) (c + 65248);
30             }
31         }
32         return new String(temp);
33     }
34     //右对齐,半角转全角
35     public static String rightAlign(String str, int len, char c) {
36         char array[] = str.toCharArray();
37         for (int i = 0; i < array.length; i++) {
38             if (array[i] == ‘ ‘) {
39                 array[i] = ‘\u3000‘;
40             } else if (array[i] < ‘\177‘) {
41                 array[i] = (char) (array[i] + 65248);
42             }
43         }
44         int sub = len - str.length();
45         if (sub <= 0) {
46             return new String(array);
47         }
48         char[] temp = new char[len];
49         System.arraycopy(array, 0, temp, sub, str.length());
50         for (int j = 0;j < sub; j++) {//右对齐左填充
51             if (c == ‘ ‘) {
52                 temp[j] = ‘\u3000‘;
53             } else if (c < ‘\177‘) {
54                 temp[j] = (char) (c + 65248);
55             }
56         }
57         return new String(temp);
58     }
59     //全角转半角，输出默认是半角
60     public static String quanToban(String str) {
61         char array[] = str.toCharArray();
62         for (int i = 0; i < array.length; i++) {
63             if (array[i] == ‘\u3000‘) {
64                 array[i] = ‘ ‘;
65             } else if (array[i] > ‘\uFF00‘ && array[i] < ‘\uFF5F‘) {
66                 array[i] = (char) (array[i] - 65248);
67             }
68         }
69         return new String(array);
70     }
71 }