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本篇內(nèi)容主要講解“JAVA之String中刪除指定字符方式的方法有哪些”,感興趣的朋友不妨來(lái)看看。本文介紹的方法操作簡(jiǎn)單快捷,實(shí)用性強(qiáng)。下面就讓小編來(lái)帶大家學(xué)習(xí)“JAVA之String中刪除指定字符方式的方法有哪些”吧!
通過(guò)循環(huán)從前往后遍歷,如果不是要?jiǎng)h除的字符則加到處理后的字符串中
代碼如下:
public String deleteCharString0(String sourceString, char chElemData) { String deleteString = ""; for (int i = 0; i < sourceString.length(); i++) { if (sourceString.charAt(i) != chElemData) { deleteString += sourceString.charAt(i); } } return deleteString; }
通過(guò)循環(huán)確定要?jiǎng)h除字符的位置索引,然后通過(guò)分割字符串的形式,將子字符串拼接,注意最后一段子字符串和源字符串中沒(méi)有要?jiǎng)h除字符的情況
代碼如下:
public String deleteCharString1(String sourceString, char chElemData) { String deleteString = ""; int iIndex = 0; for (int i = 0; i < sourceString.length(); i++) { if (sourceString.charAt(i) == chElemData) { if (i > 0) { deleteString += sourceString.substring(iIndex, i); } iIndex = i + 1; } } if (iIndex <= sourceString.length()) { deleteString += sourceString.substring(iIndex, sourceString.length()); } return deleteString; }
原理同上,只不過(guò)查找要?jiǎng)h除字符位置采用String類中的函數(shù)執(zhí)行,效率不如上面的高
代碼如下:
public String deleteCharString2(String sourceString, char chElemData) { String deleteString = ""; int iIndex = 0; int tmpCount = 0; do { tmpCount = sourceString.indexOf(chElemData, iIndex); if (tmpCount > 0) { deleteString += sourceString.substring(iIndex, tmpCount); } if (tmpCount != -1) { iIndex = tmpCount + 1; } } while (tmpCount != -1); if (iIndex <= sourceString.length()) { deleteString += sourceString.substring(iIndex, sourceString.length()); } return deleteString; }
原理與上方基本一致,只不過(guò)這次采用倒序方式,這里的坑就更多了,一定要注意索引的取值范圍和是否合法
代碼如下:
public String deleteCharString3(String sourceString, char chElemData) { String deleteString = ""; int iIndex = sourceString.length(); int tmpCount = 0; do { tmpCount = sourceString.lastIndexOf(chElemData, iIndex - 1); if (tmpCount < sourceString.length() && tmpCount >= 0) { deleteString = sourceString.substring(tmpCount + 1, iIndex) + deleteString; } if (tmpCount != -1) { iIndex = tmpCount; } } while (tmpCount != -1); if (iIndex >= 0) { deleteString = sourceString.substring(0, iIndex) + deleteString; } return deleteString; }
通過(guò)采用正則的方式和replaceAll函數(shù),本種方法要注意特殊字符,例如正則中的 “.”字符,需要對(duì)特殊字符進(jìn)行轉(zhuǎn)義
代碼如下:
public String deleteCharString4(String sourceString, char chElemData) { String deleteString = ""; final String strTable = "|^$*+?.(){}\\"; String tmpRegex = "["; for (int i = 0; i < strTable.length(); i++) { if (strTable.charAt(i) == chElemData) { tmpRegex += "\\"; break; } } tmpRegex += chElemData + "]"; deleteString = sourceString.replaceAll(tmpRegex, ""); return deleteString; }
采用正則的方式將字符串分割成幾個(gè)子字符串,再將子字符串進(jìn)行拼接
代碼如下:
public String deleteCharString5(String sourceString, char chElemData) { String deleteString = ""; final String strTable = "|^$*+?.(){}\\"; String tmpRegex = "["; for (int i = 0; i < strTable.length(); i++) { if (strTable.charAt(i) == chElemData) { tmpRegex += "\\"; break; } } tmpRegex += chElemData + "]"; String[] tmpStringArray = sourceString.split(tmpRegex); for (int i = 0; i < tmpStringArray.length; i++) { deleteString += tmpStringArray[i]; } return deleteString; }
將字符編程可讀序列,在通過(guò) String 類中的方法替換
代碼如下:
public String deleteCharString6(String sourceString, char chElemData) { String tmpString = ""; tmpString += chElemData; tmpString.subSequence(0, 0); String deleteString = ""; deleteString = sourceString.replace(tmpString, deleteString.subSequence(0, 0)); return deleteString; }
把原字符串轉(zhuǎn)化為字符數(shù)組,然后原理與直接插入排序原理類似
代碼如下:
public String deleteCharString7(String sourceString, char chElemData) { String deleteString = ""; char[] Bytes = sourceString.toCharArray(); int iSize = Bytes.length; for (int i = Bytes.length - 1; i >= 0; i--) { if (Bytes[i] == chElemData) { for (int j = i; j < iSize - 1; j++) { Bytes[j] = Bytes[j + 1]; } iSize--; } } for (int i = 0; i < iSize; i++) { deleteString += Bytes[i]; } return deleteString; }
原理與 第一種方法 類似,本次采用 stringBuffer 類中的 append 方法進(jìn)行操作,我認(rèn)為效率應(yīng)該高于第一種。
public String deleteCharString8(String sourceString, char chElemData) { StringBuffer stringBuffer = new StringBuffer(""); for (int i = 0; i < sourceString.length(); i++) { if (sourceString.charAt(i) != chElemData) { stringBuffer.append(sourceString.charAt(i)); } } return stringBuffer.toString(); }
采用 stringBuffer 類中的 replace and indexOf 方法(_ 故意湊方法)
代碼如下:
public String deleteCharString9(String sourceString, char chElemData) { String tmpString = ""; tmpString += chElemData; StringBuffer stringBuffer = new StringBuffer(sourceString); int iFlag = -1; do { iFlag = stringBuffer.indexOf(tmpString); if (iFlag != -1) { stringBuffer = stringBuffer.replace(iFlag, iFlag + 1, ""); } } while (iFlag != -1); return stringBuffer.toString(); }
采用 stringBuffer 類中的 deleteCharAt 和 indexOf 直接刪除
public String deleteCharString10(String sourceString, char chElemData) { String tmpString = ""; tmpString += chElemData; StringBuffer stringBuffer = new StringBuffer(sourceString); int iFlag = -1; do { iFlag = stringBuffer.indexOf(tmpString); if (iFlag != -1) { stringBuffer.deleteCharAt(iFlag); } } while (iFlag != -1); return stringBuffer.toString(); }
程序運(yùn)行截圖:
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