不借助编辑器自带的代码高亮工具（Syntaxhighlighte），生成完美格式的语法高亮代码
请看下面的代码：
public class KMP{ public static void main(String args []){ testRollBackArray(); testKMPSearchMatch(); testKMPSearchNoMatch(); } /** * each value of array rollback means: when source[i] mismatch pattern[i], * KMP will restart match process form rollback[j] of pattern with * source[i]. And if rollback[i] == -1, it means the current source[i] will * never match pattern. then i should be added by 1 and j should be set to * 0, which means restart match process from source[i+1] with pattern from * pattern[0]. * * @param pattern * @return */ private static int[] getRollbackArray(char[] pattern) { int[] rollback = new int[pattern.length]; for (int i = 0; i < pattern.length; i++) { rollback[i] = 0; } rollback[0] = -1; for (int i = 1; i < rollback.length; i++) { char prevChar = pattern[i - 1]; int prevRollback = i - 1; while (prevRollback >= 0) { int previousRollBackIdx = rollback[prevRollback]; if ((previousRollBackIdx == -1) || (prevChar == pattern[previousRollBackIdx])) { rollback[i] = previousRollBackIdx + 1; break; } else { prevRollback = rollback[prevRollback]; } } } return rollback; } /** * search pattern chars in source chars. * * @param source * @param pattern * @return */ public static int searchKMP(char[] source, char[] pattern) { // validation if (source == null || source.length == 0 || pattern == null || pattern.length == 0) { return -1; } // get the rollback array. int[] rollback = getRollbackArray(pattern); // incremental index of pattern. pointing the char to compare with. int currMatch = 0; int len = pattern.length; // i point the char to compare with for (int i = 0; i < source.length;) { // if current char match if ((currMatch == -1) || (source[i] == pattern[currMatch])) { /* * then each of the indexes adding by one, moving to the next * char for comparation. notice that if currMatch is -1, it * means the first char in pattern can not be matched. so i add * by one to move on. and currMatch add by one so its value is * 0. */ i++; currMatch++; /* * if reaches the end of pattern, then match success, return the * index of first matched char. */ if (currMatch == len) { return i - len; } } else { /* * if current char mismatch, then rollback the next char to * compare in pattern. */ currMatch = rollback[currMatch]; } } return -1; } public void testRollBackArray() { int[] expectedRollback = new int[] { -1, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 0, 0, 0 }; int[] rollback = getRollbackArray("PARTICIPATE IN PARACHUTE" .toCharArray()); Assert.assertArrayEquals("Rollback array compare failed to match!", expectedRollback, rollback); } public void testKMPSearchMatch() { int matchIndex = searchKMP( "aaaaaababacbaslierjalsdzmflkasjf".toCharArray(), "ababacb".toCharArray()); Assert.assertEquals(5, matchIndex); matchIndex = searchKMP( "aaaaaababacbaslierjalsdzmflkasjf".toCharArray(), "aaaaaababacbaslierjalsdzmflkasjf".toCharArray()); Assert.assertEquals(0, matchIndex); } public void testKMPSearchNoMatch() { int matchIndex = searchKMP("ABCABCDABABCDABCDABDE".toCharArray(), "hjABCDABD".toCharArray()); Assert.assertEquals(-1, matchIndex); } }
我这里实现语法高亮，直接是由HTML+CSS完成的。一般的编辑器都支持HTML编辑，邮件也可以哦。