blocks|key|1160799|text|String#toLowerCase和String#toUpperCase是您需要的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1160800|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/lang/String.html#toLowerCase%2528%2529|1|http://java.sun.com/javase/6/docs/api/java/lang/String.html#toUpperCase%2528%2529^0|0|I|0|J|I|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

<a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html#toLowerCase%28%29" rel="noreferrer">String#toLowerCase</a> and <a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html#toUpperCase%28%29" rel="noreferrer">String#toUpperCase</a> are the methods you need.

blocks|key|1160806|text|String#toLowerCase|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1160807|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#toLowerCase%2528%2529^0|0|I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#toLowerCase%28%29" rel="nofollow noreferrer">String#toLowerCase</a>

blocks|key|1376153|text|是。在字符串本身上有一些方法可以做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1376154|请注意，结果取决于JVM使用的语言环境。注意，区域设置本身就是一门艺术。|1376155|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Yes. There are methods on the String itself for this.

Note that the result depends on the Locale the JVM is using. Beware, locales is an art in itself.

blocks|key|1160918|text|String类中有两个方法：toUppercase()和toLowerCase()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1160919|即|1160920|String+input+=+"Cricket!";
String+upper+=+input.toUpperCase();+//stores+"CRICKET!"
String+lower+=+input.toLowerCase();+//stores+"cricket!"+|code-block|syntax|javascript|1160921|这会澄清你的疑虑|1160922|entityMap^0|E|D|S|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

There are methods in the String class; <code>toUppercase()</code> and <code>toLowerCase()</code>.

i.e.

<pre><code>String input = "Cricket!";
String upper = input.toUpperCase(); //stores "CRICKET!"
String lower = input.toLowerCase(); //stores "cricket!" 
</code></pre>

This will clarify your doubt

blocks|key|1160986|text|转换单词大写的第一个字母|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1160987|输入：|1160988|你好，世界|1160989|String+A+=+hello;
String+B+=+world;
System.out.println(A.toUpperCase().charAt(0)%2BA.substring(1)+%2B+"+"+%2B+B.toUpperCase().charAt(0)%2BB.substring(1));|code-block|syntax|javascript|1160990|输出：|1160991|Hello+World|1160992|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Coverting the first letter of word capital

input:

hello
world

<pre><code>String A = hello;
String B = world;
System.out.println(A.toUpperCase().charAt(0)+A.substring(1) + " " + B.toUpperCase().charAt(0)+B.substring(1));
</code></pre>

Output:

Hello World

blocks|key|1376317|text|假设所有字符都是按字母顺序排列的，您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1376318|从小写到大写：|1376319|//+Uppercase+letters.+
class+UpperCase+{++
++public+static+void+main(String+args[])+{+
++++char+ch;
++++for(int+i=0;+i+<+10;+i%2B%2B)+{+
++++++ch+=+(char)+('a'+%2B+i);
++++++System.out.print(ch);+

++++++//+This+statement+turns+off+the+6th+bit.+++
++++++ch+=+(char)+((int)+ch+&+65503);+//+ch+is+now+uppercase
++++++System.out.print(ch+%2B+"+");++
++++}+
++}+
}|code-block|syntax|javascript|1376320|从大写到小写：|1376321|//+Lowercase+letters.+
class+LowerCase+{++
++public+static+void+main(String+args[])+{+
++++char+ch;
++++for(int+i=0;+i+<+10;+i%2B%2B)+{+
++++++ch+=+(char)+('A'+%2B+i);
++++++System.out.print(ch);
++++++ch+=+(char)+((int)+ch+%7C+32);+//+ch+is+now+uppercase
++++++System.out.print(ch+%2B+"+");++
++++}+
++}+
}|1376322|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Assuming that all characters are alphabetic, you can do this:

From lowercase to uppercase:

<pre><code>// Uppercase letters. 
class UpperCase { 
 public static void main(String args[]) { 
 char ch;
 for(int i=0; i &lt; 10; i++) { 
 ch = (char) ('a' + i);
 System.out.print(ch); 

 // This statement turns off the 6th bit. 
 ch = (char) ((int) ch &amp; 65503); // ch is now uppercase
 System.out.print(ch + " "); 
 } 
 } 
}
</code></pre>

From uppercase to lowercase:

<pre><code>// Lowercase letters. 
class LowerCase { 
 public static void main(String args[]) { 
 char ch;
 for(int i=0; i &lt; 10; i++) { 
 ch = (char) ('A' + i);
 System.out.print(ch);
 ch = (char) ((int) ch | 32); // ch is now uppercase
 System.out.print(ch + " "); 
 } 
 } 
}
</code></pre>

What is the method for converting strings in Java between upper and lower case?

How do I convert strings between uppercase and lowercase in Java?

Java

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