在程序中,我们可以分别使用replace和replaceAll方法替换一个较长的字符串,然后使用System.nanoTime()来计算执行时间。 publicclassReplaceTest{publicstaticvoidmain(String[]args){Stringstr="This is a test string. We will replace some characters in it.";longstartTime=System.nanoTime();str.replace("e","E...
The String class does have four methods for replacing found characters or substrings, however. They are: Methods in the String Class for Manipulating Strings MethodDescription String replace(char oldChar, char newChar) Returns a new string resulting from replacing all occurrences of oldChar in this...
String replaceFirst(String regex,String replacement) Replaces the first substring of this string that matches the givenregular expression with the given replacement. String toLowerCase() Converts all of the characters in this String to lower case using the rules of the default locale. StringtoLower...
publicclassTest{publicstaticvoidmain(String[] args){StringBuffersb=newStringBuffer("YuZhen Feng");//增sb.append("nb"); System.out.println(sb);//YuZhen Fengnb//删sb.delete(2,6);//删除位置在[2,6)上的字符System.out.println(sb);//Yu Fengnbsb.deleteCharAt(1);//删除位置在1上的字符System...
可以看到replace 也是替换全部。 替换一个有函数teststr.replaceFirst(regex, replacement); 2.3两个函数的区别 可以清晰地看到replaceAll用到了正则表达式,也就是replaceAll第一个参数是正则表达式。 2.4 特殊符号的处理 //存入数据库中的数据 String str1 = "(1)1111升级服务\n(2)重磅福利\n(3)全新界面\n(4)...
/** The count is the number of characters in the String. */ private final int count; /** Cache the hash code for the string */ private int hash; // Default to 0 /** use serialVersionUID from JDK 1.0.2 for interoperability */ ...
对于 Java 初学者， 对于 String 是不可变对象总是存有疑惑。例如如下代码：Strings="ABCabc";System....
方法1 加号 “+” 拼接 和 方法2 String contact() 方法 的时间和空间成本都很高(分析在本文末尾),不能用来做批量数据的处理。 源代码,供参考 代码语言:javascript 代码运行次数:0 运行 AI代码解释 packagecnblogs.twzheng.lab2;/** * */importjava.util.ArrayList;importjava.util.List;importorg.apache.commo...
string.replace(CharSequence oldText, CharSequence newText) Here, string is an object of the String class. replace() Parameters To replace a single character, the replace() method takes these two parameters: oldChar - the character to be replaced in the string newChar - matching characters are...
Note that backslashes (\) and dollar signs ($) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string; see Matcher.replaceAll. Use java.util.regex.Matcher.quoteReplacement to suppress the special meaning of these characters,...