1. 使用substring()和toLowerCase() 这是一种简单而常用的方法,使用substring()方法获取字符串的首字母并转换为小写,然后与原字符串的剩余部分拼接起来。 publicstaticStringtoLowerCaseFirstChar(Stringstr){if(str==null||str.isEmpty()){returnstr;}returnstr.substring(0,1).toLowerCase()+str.substring(1)...
2. 将字符串的首字母转换为大写或小写 如果我们只想将字符串的首字母转换为大写或小写,可以使用substring()方法和toUpperCase()或toLowerCase()方法结合实现。下面是示例代码: Stringstr="hello world";StringfirstLetterUpperCase=str.substring(0,1).toUpperCase()+str.substring(1);StringfirstLetterLowerCase=str....
You can use Charater class’s touppercase method to convert char to uppercase in java. Method signature Java 1 2 3 public static char touppercase(char ch) Parameters ch is primitive character type. Return type return type is char. If char is already uppercase then it will return same. ...
Change char case In this chapter you will learn: Is Character a upper/lower Case The following code usesCharacter.isUpperCasemethod to tell is a char a uppercase char publicclassMain {publicstaticvoidmain(String[] args) {charsymbol ='A';/*fromjava2s.com*/if(Character.isUpperCase(symbol)) ...
publicclassCharUpperLowerCase{publicstaticvoidmain(String[]args){charchar1,char2;char1='a'&0x5f;char2='B'|0x20;System.out.println(char1);System.out.println(char2);}} Output: In this example, we usetheStringUtilsclasspresent in Apache Commons Library. First, we include the library in our...
.toTitleCase(first))+in.substring(1);}// BEANSPECpublicStringcapitalize2(Stringin){if(in.length()==0)returnin;charfirst=in.charAt(0);if(!Character.isLowerCase(first)||(in.length()>1&&Character.isUpperCase(in.charAt(1)))returnin;booleanuseUpperCase=in.length()>2&&Character.isTitleCase(in...
Converts the character (Unicode code point) argument to titlecase using case mapping information from the UnicodeData file. If a character has no explicit titlecase mapping and is not itself a titlecase char according to UnicodeData, then the uppercase mapping is returned as an equivalent titleca...
}protectedstaticString firstLowerCase(String str) {returnstr.substring(0, 1).toLowerCase() + str.substring(1); } protectedstaticString firstUpperCase(String str) {char[] cs=str.toCharArray(); cs[0]-=32;returnString.valueOf(cs);
static byteTITLECASE_LETTER Unicode仕様の汎用カテゴリ「Lt」。 static Class<Character>TYPE プリミティブ型charを表すClassインスタンス。 static byteUNASSIGNED Unicode仕様の汎用カテゴリ「Cn」。 static byteUPPERCASE_LETTER Unicode仕様の汎用カテゴリ「Lu」。 コンストラクタのサマリー コンストラ...
* character from upper case to lower case, but in the (unusual) special * case when there is more than one character and both the first and * second characters are upper case, we leave it alone. * * Thus "FooBah" becomes "fooBah" ...