1 public static String removeStr(String src, String str) {
2 if (src == null || str == null) return src;
3 int idx = src.indexOf(str);
4 if (idx == -1) return src;
5 int pst = 0;
6 char[] cs = src.toCharArray();
7 char[] rs = new char[src.length() - str.length()];
8 for (int i = 0; i < cs.length; i ++) {
9 if (i >= idx && i < idx + str.length()) continue;
10 rs[pst] = cs[i];
11 pst ++;
12 }
13 return new String(rs);
14 }
15 public static String replaceStr(String src, String target, String replacement) {
16 if (src == null || target == null || replacement == null) return src;
17 int idx = src.indexOf(target);
18 if (idx == -1) return src;
19 int pst = 0;
20 char[] cs = src.toCharArray();
21 char[] rs = new char[src.length() - target.length() + replacement.length()];
22 for (int i = 0; i < cs.length; i ++) {
23 if (i == idx) {
24 for (char c : replacement.toCharArray()) {
25 rs[pst] = c;
26 pst ++;
27 }
28 continue;
29 }
30 if (i > idx && i < idx + target.length()) continue;
31 rs[pst] = cs[i];
32 pst ++;
33 }
34 return new String(rs);
35 }
36 /**
37 *
38 * @param src
39 * @param target
40 * @param replacement
41 * @return
42 */
43 public static String replaceAllStr(String src, String target, String replacement) {
44 if (src == null || target == null || replacement == null) return src;
45 int idx = src.indexOf(target);
46 if (idx == -1) return src;
47 int pst = 0;
48 char[] cs = src.toCharArray();
49 char[] rs = new char[src.length() - target.length() + replacement.length()];
50 for (int i = 0; i < cs.length; i ++) {
51 if (i == idx) {
52 for (char c : replacement.toCharArray()) {
53 rs[pst] = c;
54 pst ++;
55 }
56 continue;
57 }
58 if (i > idx && i < idx + target.length()) continue;
59 rs[pst] = cs[i];
60 pst ++;
61 }
62 return replaceAllStr(new String(rs), target, replacement);
63 }
