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Java String toUpperCase()

The java string toUpperCase() metoda vrací řetězec velkými písmeny. Jinými slovy, převede všechny znaky řetězce na velká písmena.

Metoda toUpperCase() funguje stejně jako metoda toUpperCase(Locale.getDefault()). Interně používá výchozí národní prostředí.


Interní implementace

 public String toUpperCase(Locale locale) { if (locale == null) { throw new NullPointerException(); } int firstLower; final int len = value.length; /* Now check if there are any characters that need to be changed. */ scan: { for (firstLower = 0 ; firstLower = Character.MIN_HIGH_SURROGATE) &amp;&amp; (c <= character.max_high_surrogate)) { c="codePointAt(firstLower);" srccount="Character.charCount(c);" } else int uppercasechar="Character.toUpperCaseEx(c);" if ((uppercasechar="=" character.error) || (c !="upperCaseChar))" break scan; firstlower +="srcCount;" return this; char[] result="new" char[len]; * may grow resultoffset="0;" grow, so i+resultoffset is the write location in just copy first few uppercase characters. system.arraycopy(value, 0, result, firstlower); string lang="locale.getLanguage();" boolean localedependent="(lang" =="tr" 'az' 'lt'); upperchararray; upperchar; srcchar; srccount; for (int i="firstLower;" <len; srcchar="(int)value[i];" ((char)srcchar>= Character.MIN_HIGH_SURROGATE &amp;&amp; (char)srcChar = Character.MIN_SUPPLEMENTARY_CODE_POINT)) { if (upperChar == Character.ERROR) { if (localeDependent) { upperCharArray = ConditionalSpecialCasing.toUpperCaseCharArray(this, i, locale); } else { upperCharArray = Character.toUpperCaseCharArray(srcChar); } } else if (srcCount == 2) { resultOffset += Character.toChars(upperChar, result, i + resultOffset) - srcCount; continue; } else { upperCharArray = Character.toChars(upperChar); } /* Grow result if needed */ int mapLen = upperCharArray.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]="upperCharArray[x];" } - srccount); else resultoffset]="(char)upperChar;" return new string(result, 0, len resultoffset); < pre> <hr> <h3>Signature</h3> <p>There are two variant of toUpperCase() method. The signature or syntax of string toUpperCase() method is given below:</p> <pre> public String toUpperCase() public String toUpperCase(Locale locale) </pre> <p>The second method variant of toUpperCase(), converts all the characters into uppercase using the rules of given Locale.</p> <hr> <h3>Returns</h3> <p>string in uppercase letter.</p> <hr> <h2>Java String toUpperCase() method example</h2> <pre> public class StringUpperExample{ public static void main(String args[]){ String s1=&apos;hello string&apos;; String s1upper=s1.toUpperCase(); System.out.println(s1upper); }} </pre> <span> Test it Now </span> <p>Output:</p> <pre> HELLO STRING </pre> <h2>Java String toUpperCase(Locale locale) Method Example 2</h2> <pre> import java.util.Locale; public class StringUpperExample2 { public static void main(String[] args) { String s = &apos;hello string&apos;; String turkish = s.toUpperCase(Locale.forLanguageTag(&apos;tr&apos;)); String english = s.toUpperCase(Locale.forLanguageTag(&apos;en&apos;)); System.out.println(turkish);//will print I with dot on upper side System.out.println(english); } }</pre> <p>Output:</p> <pre> HELLO STR?NG HELLO STRING </pre></maplen;></=>

Druhá varianta metody toUpperCase() převádí všechny znaky na velká písmena pomocí pravidel daného Locale.


Návraty

řetězec velkým písmenem.


Příklad metody Java String toUpperCase().

 public class StringUpperExample{ public static void main(String args[]){ String s1=&apos;hello string&apos;; String s1upper=s1.toUpperCase(); System.out.println(s1upper); }} 
Otestujte to hned

Výstup:

 HELLO STRING 

Příklad metody Java String toUpperCase(Locale locale) 2

 import java.util.Locale; public class StringUpperExample2 { public static void main(String[] args) { String s = &apos;hello string&apos;; String turkish = s.toUpperCase(Locale.forLanguageTag(&apos;tr&apos;)); String english = s.toUpperCase(Locale.forLanguageTag(&apos;en&apos;)); System.out.println(turkish);//will print I with dot on upper side System.out.println(english); } }

Výstup:

 HELLO STR?NG HELLO STRING