Java如何将拼接字符串中的最后一个逗号去掉 java中字符串如何去除最后一个字符
Java\u5982\u4f55\u5c06\u62fc\u63a5\u5b57\u7b26\u4e32\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u9017\u53f7\u53bb\u6389\u901a\u8fc7lastIndexOf\u627e\u5230\u6700\u540e\u4e00\u4e2a\u9017\u53f7\u7684\u4f4d\u7f6e\uff0c\u7136\u540e\u901a\u8fc7substring\u53bb\u6389\u6700\u540e\u4e00\u4e2a\u9017\u53f7
\u5b9a\u4e49\u4e00\u4e2a\u9700\u8981\u53bb\u6389\u9017\u53f7\u7684str
String str = "123,233,323";//\u5b9a\u4e00\u4e2a\u5b57\u7b26\u4e321\u3001\u901a\u8fc7lastIndexOf\u67e5\u627e\u6700\u540e\u4e00\u4e2a\u9017\u53f7
\u8fd4\u56de String \u5bf9\u8c61\u4e2d\u5b50\u5b57\u7b26\u4e32\u6700\u540e\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002strObj.lastIndexOf(substring[, tartindex])\uff0c\u4ece\u53f3\u5411\u5de6\u6267\u884c\u67e5\u627e\u5b57\u7b26\u4e32\u3002
int idx = str.lastIndexOf(",");2\u3001\u901a\u8fc7substring\u622a\u53d6\u5b57\u4e32
str\uff1dstr.substring(int beginIndex\uff0cint endIndex);\u622a\u53d6str\u4e2d\u4ecebeginIndex\u5f00\u59cb\u81f3endIndex\u7ed3\u675f\u65f6\u7684\u5b57\u7b26\u4e32\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9str;
\u4f8b\u5982\uff1a
String str1 = str.substring(0,idx);;//\u901a\u8fc7\u622a\u53d6\u9017\u53f7\u524d\u7684\u5b57\u7b26\u4e32String str2 = str.substring(idx+1,str.length());//\u622a\u53d6\u9017\u53f7\u540e\u7684\u5b57\u7b26\u4e32str = str1 + str2;//\u9017\u53f7\u524d\u5b57\u7b26\u4e32\u548c\u9017\u540e\u540e\u7684\u5b57\u7b26\u4e32\u62fc\u63a5\uff0c\u7ed3\u679c\u662f\u53bb\u6389\u9017\u53f7\u540e\u7684\u5b57\u7b26\u4e32
\u5229\u7528java\u4e2dString\u7c7b\u7684substring()\u5b57\u7b26\u4e32\u622a\u53d6\u65b9\u6cd5 \u548clength()\u6c42\u5b57\u7b26\u4e32\u957f\u5ea6\u65b9\u6cd5\u5373\u53ef\u3002
1\u3001\u8bed\u6cd5\u89e3\u6790\uff1a
public String substring(int beginIndex, int endIndex)\uff1b\u7b2c\u4e00\u4e2aint\u4e3a\u5f00\u59cb\u7684\u7d22\u5f15\uff0c\u5bf9\u5e94String\u6570\u5b57\u4e2d\u7684\u5f00\u59cb\u4f4d\u7f6e\uff1b\u7b2c\u4e8c\u4e2a\u662f\u622a\u6b62\u7684\u7d22\u5f15\u4f4d\u7f6e\uff0c\u5bf9\u5e94String\u4e2d\u7684\u7ed3\u675f\u4f4d\u7f6e\u3002
2\u3001\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a
3\u3001\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a
\u6269\u5c55\u8d44\u6599\uff1a
\u4f7f\u7528RTrim\uff0c\u6b64\u51fd\u6570\u4e0d\u4ec5\u4ec5\u7528\u6765\u5220\u9664\u6700\u540e\u7684\u7a7a\u683c\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5trim\u6389\u4e00\u4e9b\u5b57\u7b26 \u3002
1\u3001\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a
2\u3001\u4f7f\u7528TrimEnd\uff0c\u6b64\u51fd\u6570\u548cRTrim\u7c7b\u4f3c\uff0c\u533a\u522b\u662f\u8fd9\u4e2a\u4f20\u9012\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\uff0c\u800cRTrim\u53ef\u4ee5\u662f\u4efb\u4f55\u6709\u6548\u7684\u5b57\u7b26\u4e32\u3002
\u6267\u884c\u4ee3\u5982\u4e0b\uff1a
\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a
\u53c2\u8003\u8d44\u6599\uff1a
\u767e\u5ea6\u767e\u79d1--substring
\u767e\u5ea6\u767e\u79d1--trim
然后通过substring去掉最后一个逗号
定义一个需要去掉逗号的str。
String str = "123,233,323";//定一个字符串
绛旓細System.in);String str = scanner.nextLine();//浠庨敭鐩樿緭鍏ヤ竴绯诲垪鐨勫瓧绗har[] cs =str.toCharArray();//灏嗚緭鍏ョ殑鎵鏈夊唴瀹硅浆鎹㈠埌鏁扮粍涓瑼rrays.sort(cs);//瀵规暟缁勮繘琛屼粠灏忓埌澶х殑鎺掑簭System.out.println(cs[cs.length-1]);//杈撳嚭鏁扮粍鐨勬渶鍚庝竴涓厓绱狅紝鍗虫渶澶х殑瀛楃}甯屾湜瀵逛綘鏈夊府鍔┿傛湜閲囩撼銆
绛旓細= new StringBuffer(str).append("c").toString();铏界劧缂栬瘧鍣ㄥ瀛楃涓插姞鍙峰仛浜嗕紭鍖栵紝瀹冧細鐢⊿tringBuffer鐨刟ppend鏂规硶杩涜杩藉姞銆傚啀鏄氳繃toString鏂规硶杞崲鎴String瀛楃涓茬殑銆傚畠涓庣函绮圭殑append鏂规硶鏄笉鍚岀殑锛氫竴鏄瘡娆￠兘瑕佸垱寤轰竴涓猄tringBuilder瀵硅薄锛涗簩鏄瘡娆℃墽琛屽畬姣曢兘瑕佽皟鐢╰oString鏂规硶灏嗗叾杞崲涓哄瓧绗︿覆銆
绛旓細鐩存帴璋冪敤string.charAt(index)鏂规硶寰幆灏卞彲浠ヤ簡 public class Test { public static void main(String[] args) { String firstStr = "abcdefg12345";String secondStr = getEachCharInTheStr(firstStr);System.out.println(secondStr);} private static String getEachCharInTheStr(String str) { Strin...
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