The Ciąg Java toLowerCase() Metoda zwraca ciąg znaków zapisany małymi literami. Innymi słowy, konwertuje wszystkie znaki ciągu na małe litery.

Metoda toLowerCase() działa tak samo jak metoda toLowerCase(Locale.getDefault()). Wewnętrznie używa domyślnych ustawień regionalnych.

Wdrożenie wewnętrzne

 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) &amp;&amp; (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 &amp;&amp; (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 &amp;&amp; srcChar == &apos;u0130&apos;) { 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 &gt; 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=&apos;JAVATPOINT HELLO stRIng&apos;; 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&apos;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 = &apos;JAVATPOINT HELLO stRIng&apos;; String eng = s.toLowerCase(Locale.ENGLISH); System.out.println(eng); String turkish = s.toLowerCase(Locale.forLanguageTag(&apos;tr&apos;)); // It shows i without dot System.out.println(turkish); } } </pre> <p>Output:</p> <pre> javatpoint hello string javatpo?nt hello str?ng </pre></maplen;></=></=>

Drugi wariant metody toLowerCase() konwertuje wszystkie znaki na małe litery, korzystając z reguł podanych ustawień regionalnych.

Zwroty

ciąg znaków pisany małymi literami.

Przykład metody 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); }} 

Wyjście:

 javatpoint hello string 

Metoda Java String toLowerCase (Locale) Przykład 2

Ta metoda pozwala nam przekazać ustawienia regionalne także dla różnych języków. Zobaczmy poniższy przykład, w którym otrzymujemy ciąg znaków w języku angielskim i tureckim.

 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); } } 

Wyjście:

 javatpoint hello string javatpo?nt hello str?ng