JAVA中string.replace和string.replaceAll的区别及用法
JAVA\u4e2dstring.replace\u548cstring.replaceAll\u7684\u533a\u522b\u53ca\u7528\u6cd51)replace\u7684\u53c2\u6570\u662fchar\u548cCharSequence,\u5373\u53ef\u4ee5\u652f\u6301\u5b57\u7b26\u7684\u66ff\u6362,\u4e5f\u652f\u6301\u5b57\u7b26\u4e32\u7684\u66ff\u6362(CharSequence\u5373\u5b57\u7b26\u4e32\u5e8f\u5217\u7684\u610f\u601d,\u8bf4\u767d\u4e86\u4e5f\u5c31\u662f\u5b57\u7b26\u4e32);
2)replaceAll\u7684\u53c2\u6570\u662fregex,\u5373\u57fa\u4e8e\u89c4\u5219\u8868\u8fbe\u5f0f\u7684\u66ff\u6362,\u6bd4\u5982,\u53ef\u4ee5\u901a\u8fc7replaceAll("\\d", "*")\u628a\u4e00\u4e2a\u5b57\u7b26\u4e32\u6240\u6709\u7684\u6570\u5b57\u5b57\u7b26\u90fd\u6362\u6210\u661f\u53f7;
1\u3001\u66ff\u6362\u65b9\u5f0f\u4e0d\u540c
\u3010public String replace( )\u3011
\u662f\u901a\u8fc7\u7528 newChar \u66ff\u6362\u6b64\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u6240\u6709 oldChar \u800c\u751f\u6210\u7684\u3002
\u3010public String replaceAll( )\u3011
\u4f7f\u7528\u7ed9\u5b9a\u7684 replacement \u5b57\u7b26\u4e32\u66ff\u6362\u6b64\u5b57\u7b26\u4e32\u5339\u914d\u7ed9\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u6bcf\u4e2a\u5b50\u5b57\u7b26\u4e32\u3002
2\u3001\u53c2\u6570\u4e0d\u540c
\u3010replace\u3011\u7684\u53c2\u6570\u662fchar\u548cCharSequence\u3002\u53ef\u4ee5\u652f\u6301\u5b57\u7b26\u7684\u66ff\u6362\uff0c\u4e5f\u652f\u6301\u5b57\u7b26\u4e32\u7684\u66ff\u6362\u3002
\u3010replaceAll\u3011\u7684\u53c2\u6570\u662fregex\uff0cregex\u8868\u793a\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\u3002\u5373\u57fa\u4e8e\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u66ff\u6362\u3002
\u7528\u6cd5\u8303\u4f8b\u4e00\uff1a
public static void main(String[] arg) throws OgnlException {
String s =\u201dsdf\\a\\aa\u201d;
//\u628as\u4e2d\u7684\u53cd\u659c\u6760\ \u66ff\u6362\u4e3a\\
System.out.println(s);
System.out.println(s.replaceAll(\u201c\\\\\u201d, \u201c\\\\\\\\\u201d));
System.out.println(s.replace(\u201c\\\u201d, \u201c\\\\\u201d));
}
\u7528\u6cd5\u8303\u4f8b\u4e8c\uff1a
String str = "wel2come3Souhe";
String str1 = str.replace("e", "E");
String str3 = str.replace('e', 'E');
System.out.println("replace\u5b57\u7b26\u4e32==" + str1);
System.out.println("replace\u5b57\u7b26=="+str3);
String str2 = str.replaceAll("\\d", "a");//\u5c06\u6570\u5b57\u66ff\u6362a
System.out.println("replaceAll==" + str2);
\u8f93\u51fa\u7ed3\u679c\uff1a
replace\u5b57\u7b26\u4e32==wEl2comE3SouhE
replace\u5b57\u7b26==wEl2comE3SouhE
replaceAll==welacomeaSouhe
\u6269\u5c55\u8d44\u6599
Java\u4e2d\u7684String\u7c7b
1\u3001String\u7c7b\u662ffinal\u7c7b\uff0c\u56e0\u6b64String\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002
2\u3001String\u7684\u6210\u5458\u65b9\u6cd5\u90fd\u9ed8\u8ba4\u4e3afinal\u65b9\u6cd5\u3002
3\u3001\u88abfinal\u4fee\u9970\u7684\u7c7b\u662f\u4e0d\u5141\u8bb8\u88ab\u7ee7\u627f\u7684\uff0c\u5e76\u4e14\u8be5\u7c7b\u4e2d\u7684\u6210\u5458\u65b9\u6cd5\u90fd\u9ed8\u8ba4\u4e3afinal\u65b9\u6cd5\u3002
4\u3001String\u7c7b\u5176\u5b9e\u662f\u901a\u8fc7char\u6570\u7ec4\u6765\u4fdd\u5b58\u5b57\u7b26\u4e32\u7684\u3002
5\u3001String\u5bf9\u8c61\u4e00\u65e6\u88ab\u521b\u5efa\u5c31\u662f\u56fa\u5b9a\u4e0d\u53d8\u7684\u3002
6\u3001\u5bf9String\u5bf9\u8c61\u7684\u4efb\u4f55\u6539\u53d8\u90fd\u4e0d\u5f71\u54cd\u5230\u539f\u5bf9\u8c61\uff0c\u76f8\u5173\u7684\u4efb\u4f55change\u64cd\u4f5c\u90fd\u4f1a\u751f\u6210\u65b0\u7684\u5bf9\u8c61\u3002
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-Java
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-string
一、replace和replaceAll的区别
1、参数区别
1) replace的参数是char和CharSequence,即可以支持字符的替换,也支持字符串的替换(CharSequence即字符串序列的意思,说白了也就是字符串)
2) replaceAll的参数是regex,即基于规则表达式的替换,比如,可以通过replaceAll("\\d", "*")把一个字符串所有的数字字符都换成星号
2、使用转义字符进行替换时候的区别
1）replace可以直接使用转义字符进行替换，例如：
System.out.println(x.replace("\\", "++")); //没有问题2）replaceAll不可以直接使用转义字符进行替换，例如：
System.out.println(x.replaceAll("\\", "++"));
//报错 java.util.regex.PatternSyntaxExceptionreplaceAll的参数就是regex，是正则表达式。首先会转义，所以报错。可改为如下代码：
System.out.println(x.replaceAll("\\\\", "++"));总结：当字符串无法确定是否具有转义字符时，而且也不需要转义时，建议使用replace函数；否则，使用replaceAll函数
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