Le chaîne Java toLowerCase() La méthode renvoie la chaîne en lettre minuscule. En d’autres termes, il convertit tous les caractères de la chaîne en lettres minuscules.
La méthode toLowerCase() fonctionne de la même manière que la méthode toLowerCase(Locale.getDefault()). Il utilise en interne les paramètres régionaux par défaut.
Implémentation interne
public String toLowerCase(Locale locale) { if (locale == null) { throw new NullPointerException(); } int firstUpper; final int len = value.length; /* Now check if there are any characters that need to be changed. */ scan: { for (firstUpper = 0 ; firstUpper = Character.MIN_HIGH_SURROGATE) && (c <= character.max_high_surrogate)) { int supplchar="codePointAt(firstUpper);" if (supplchar !="Character.toLowerCase(supplChar))" break scan; } firstupper +="Character.charCount(supplChar);" else (c firstupper++; return this; char[] result="new" char[len]; resultoffset="0;" * may grow, so i+resultoffset is the write location in just copy first few lowercase characters. system.arraycopy(value, 0, result, firstupper); string lang="locale.getLanguage();" boolean localedependent="(lang" =="tr" || 'az' 'lt'); lowerchararray; lowerchar; srcchar; srccount; for (int i="firstUpper;" <len; srcchar="(int)value[i];" ((char)srcchar>= Character.MIN_HIGH_SURROGATE && (char)srcChar <= character.max_high_surrogate) { srcchar="codePointAt(i);" srccount="Character.charCount(srcChar);" } else if (localedependent || 'u03a3') greek capital letter sigma lowerchar="ConditionalSpecialCasing.toLowerCaseEx(this," i, locale); (srcchar="=" 'u0130') latin i dot ((lowerchar="=" character.error) (lowerchar>= Character.MIN_SUPPLEMENTARY_CODE_POINT)) { if (lowerChar == Character.ERROR) { if (!localeDependent && srcChar == 'u0130') { lowerCharArray = ConditionalSpecialCasing.toLowerCaseCharArray(this, i, Locale.ENGLISH); } else { lowerCharArray = ConditionalSpecialCasing.toLowerCaseCharArray(this, i, locale); } } else if (srcCount == 2) { resultOffset += Character.toChars(lowerChar, result, i + resultOffset) - srcCount; continue; } else { lowerCharArray = Character.toChars(lowerChar); } /* Grow result if needed */ int mapLen = lowerCharArray.length; if (mapLen > srcCount) { char[] result2 = new char[result.length + mapLen - srcCount]; System.arraycopy(result, 0, result2, 0, i + resultOffset); result = result2; } for (int x = 0; x <maplen; ++x) { result[i + resultoffset x]="lowerCharArray[x];" } - srccount); else resultoffset]="(char)lowerChar;" return new string(result, 0, len resultoffset); < pre> <h3>Signature</h3> <p>There are two variant of toLowerCase() method. The signature or syntax of string toLowerCase() method is given below:</p> <pre> public String toLowerCase() public String toLowerCase(Locale locale) </pre> <p>The second method variant of toLowerCase(), converts all the characters into lowercase using the rules of given Locale.</p> <hr> <h3>Returns</h3> <p>string in lowercase letter.</p> <hr> <h2>Java String toLowerCase() method example</h2> <pre> public class StringLowerExample{ public static void main(String args[]){ String s1='JAVATPOINT HELLO stRIng'; String s1lower=s1.toLowerCase(); System.out.println(s1lower); }} </pre> <span> Test it Now </span> <p>Output:</p> <pre> javatpoint hello string </pre> <h2>Java String toLowerCase(Locale locale) Method Example 2</h2> <p>This method allows us to pass locale too for the various langauges. Let's see an example below where we are getting string in english and turkish both.</p> <pre> import java.util.Locale; public class StringLowerExample2 { public static void main(String[] args) { String s = 'JAVATPOINT HELLO stRIng'; String eng = s.toLowerCase(Locale.ENGLISH); System.out.println(eng); String turkish = s.toLowerCase(Locale.forLanguageTag('tr')); // It shows i without dot System.out.println(turkish); } } </pre> <p>Output:</p> <pre> javatpoint hello string javatpo?nt hello str?ng </pre></maplen;></=></=> La deuxième variante de méthode de toLowerCase() convertit tous les caractères en minuscules en utilisant les règles de la localisation donnée.
Retour
chaîne en lettre minuscule.
Exemple de méthode Java String toLowerCase()
public class StringLowerExample{ public static void main(String args[]){ String s1='JAVATPOINT HELLO stRIng'; String s1lower=s1.toLowerCase(); System.out.println(s1lower); }} Testez-le maintenant Sortir:
javatpoint hello string
Méthode Java String toLowerCase (Locale locale) Exemple 2
Cette méthode nous permet également de transmettre les paramètres régionaux pour les différentes langues. Voyons un exemple ci-dessous où nous obtenons une chaîne en anglais et en turc.
import java.util.Locale; public class StringLowerExample2 { public static void main(String[] args) { String s = 'JAVATPOINT HELLO stRIng'; String eng = s.toLowerCase(Locale.ENGLISH); System.out.println(eng); String turkish = s.toLowerCase(Locale.forLanguageTag('tr')); // It shows i without dot System.out.println(turkish); } } Sortir:
javatpoint hello string javatpo?nt hello str?ng