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- public class test {
- public static void main(String[] args)
- {
- StringBuffer sp_string = new StringBuffer("AbCdE");
- swapPairs(sp_string);
- System.out.println(sp_string);
- swapPairs(sp_string);
- System.out.println(sp_string);
- /* :!javac test.java && java test
- * bAdCE
- * AbCdE
- */
- }
- public static void swapPairs(StringBuffer s)
- {
- int s_len = s.length();
- char stash = '\0';
- // This covers zero and 1 length strings.
- if (s_len < 2) {
- return;
- }
- for (int i = 0; i < s_len; i += 2) {
- if (i + 2 > s_len) {
- break;
- }
- stash = s.charAt(i);
- s.setCharAt(i, s.charAt(i+1));
- s.setCharAt(i + 1, stash);
- }
- }
- }
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