为了比较substring方法和replace方法的性能,我们将对一个较长的字符串执行多次替换操作,并计算执行时间。 2.1 使用substring方法 Stringstr="Hello, World!";longstartTime=System.nanoTime();for(inti=0;i<10000;i++){str=str.substring(0,7)+"Java"+str.substring(12);}longendTime=System.nanoTime();Syste...
Stringstr="Hello, world!";StringnewStr=str.replace("world","Java"); 1. 2. 上面的代码会将字符串中的"world"替换为"Java",返回结果为"Hello, Java!"。 速度比较 为了比较substring和replace方法的速度差异,我们可以编写一个简单的测试代码: publicclassSpeedTest{publicstaticvoidmain(String[]args){Strings...
string str = “GTAZB_JiangjBen_123”; string[] sArray = str.Split( new string[]{“Ji”,”jB”}, StringSplitOptions.RemoveEmptyEntries); foreach(string e in sArray) { Console.WriteLine(e); } 得到sArray[0]=”GTAZB_”,sArray[1]=”ang”,sArray[2]=”en_123″; Substring的使用: 1....
String are immutable in Java. You can't change them. You need to create a new string with the character replaced. String myName = "domanokz"; String newName= myName.substring(0,4)+'x'+myName.substring(5); or you can use a StringBuilder: StringBuilder myName =newStringBuilder("domanok...
Java Program : importjava.io.*;publicclassMain{publicstaticfinalStringSTRING_A="new";publicstaticfinalStringSTRING_B="old";publicstaticvoidmain(String[]args)throwsjava.lang.Exception{//1StringoriginalFilePath="C://sample.txt";StringoriginalFileContent="";//2BufferedReaderreader=null;BufferedWriterwri...
1.Stringreplace(char oldChar, char newChar) 描述:Returnsastringresultingfromreplacing all occurrencesofoldCharinthisstringwithnewChar. 谷歌翻译:返回使用newChar替换此字符串中所有出现的oldChar而产生的字符串。2.Stringreplace(CharSequencetarget,CharSequencereplacement) ...
oldText - the substring to be replaced in the string newText - matching substrings are replaced with this string replace() Return Value The replace() method returns a new string where each occurrence of the matching character/text is replaced with the new character/text. Example 1: Java Str...
Stringstr="Hello, today is 2022-02-15";StringreplacedStr=str.replaceAll("\\d{4}-\\d{2}-\\d{2}",m->{Stringdate=m.group();intyear=Integer.parseInt(date.substring(0,4));intmonth=Integer.parseInt(date.substring(5,7));intday=Integer.parseInt(date.substring(8,10));StringnewDate=Strin...
上面是API中给予的解释,在java.lang.String类里。其实就是一个字符串替换函数,使用例子如下:"aabbccaa".replace("aa", "dd");那么结果应该会是ddbbccdd这样。 0 0 0 桃花长相依 String s="123456(sss)";String substring = s.substring(s.indexOf("("), s.indexOf(")")+1);//replace(替换前内容...
Stringstring="how to do in java";StringupdatedString=string.replaceFirst("\\s","-");System.out.println(updatedString);//how-to do in java 3. Escaping Special Characters with Double Backslash Although we can pass the regex as a substring pattern to match, the original string may contain sp...