importjava.util.Scanner;publicclassMain{publicstaticvoidmain(String[]args){Scannerscanner=newScanner(System.in);System.out.println("请输入文件名:");StringfileName=scanner.nextLine();charfirstChar=fileName.charAt(0);charnewFirstChar=Character.toUpperCase(firstChar);StringBuilderstringBuilder=newStringBuilder(...
String str1="asdljbbabdjsfkaa3938bb";charc_low=str.charAt(0); System.out.println(c_low);charc_up=Character.toUpperCase(c_low); str=str.replaceFirst(String.valueOf(c_low), String.valueOf(c_up)); System.out.println(str);//使用String的replace(oldChar,newChar)str1=str1.replace('b'...
In this specific case: //r/_tells Bash to replace first occurrence ofrwith_in the value of string. To deep dive further: /indicates a single replacement (i.e., replace first occurrence, not just all). ris the character we are looking to replace. ...
String.replaceFirst()to Replace Only the First Occurrence of a Character in a Java String There might be more than one occurrence of the same character we want to replace in a string. If we want to replace only the character’s first occurrence and ignore other occurrences after that. It ...
的java.lang.String.replaceFirst(java.lang.String, java.lang.String)Java 檔。 此頁面的部分是根據 Android 開放原始碼專案所建立和共用的工作進行修改,並根據 Creative Commons 2.5 屬性授權中所述的詞彙使用。 適用於 產品版本 .NET for Android.NET for Android API 33, .NET for Android API 34 ...
To replace the first occurrence of a character in Java, use the replaceFirst() method. Here is our string. String str = "The Haunting of Hill House!"; Let us replace the first occurrence of character “H” str.replaceFirst("(?:H)+", "B"); ...
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)...
replace各个方法的定义 一、replaceFirst方法 public String replaceFirst(String regex, String replacement) { return Pattern.compile(regex).matcher(this).replaceFirst(replacement); } 二、replace方法 public String replace(CharSequence target, CharSequence replacement) { ...
For such metacharacters, use a double backward slash (\\) to skip that meta character. Stringstring="how+to+do+in+java";StringupdatedString=string.replaceFirst("\\+","-");System.out.println(updatedString);//how-to+do+in+java 4. The‘null’is Not Allowed ...
The index of the first character is 0, while the index of the last character is length()-1. For example, the following code gets the character at index 9 in a string: String anotherPalindrome = "Niagara. O roar again!"; char aChar = anotherPalindrome.charAt(9); Indices begin at 0...