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 }