blocks|key|1302368|text|String+s+=+"xyz";
for(int+i+=+0;+i+<+s.length();+i%2B%2B)
{
+++char+c+=+s.charAt(i);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1302369|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>String s = "xyz";
for(int i = 0; i &lt; s.length(); i++)
{
 char c = s.charAt(i);
}
</code></pre>

&nbsp;

blocks|key|1087310|text|另一个有用的解决方案是，您可以将此字符串用作字符串数组|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1087311|for+(String+s+:+"xyz".split(""))+{
++++System.out.println(s);
}|code-block|syntax|javascript|1087312|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Another useful solution, you can work with this string as array of String

<pre><code>for (String s : "xyz".split("")) {
 System.out.println(s);
}
</code></pre>

blocks|key|1087259|text|您需要使用String类的toCharArray()方法将String对象转换为字符数组：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1087260|String+str+=+"xyz";
char+arr[]+=+str.toCharArray();+//+convert+the+String+object+to+array+of+char

//+iterate+over+the+array+using+the+for-each+loop.+++++++
for(char+c:+arr){
++++System.out.println(c);
}|code-block|syntax|javascript|1087261|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#toCharArray%2528%2529^0|D|B|D|B|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

You need to convert the String object into an array of char using the <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#toCharArray%28%29" rel="noreferrer"><code>toCharArray</code></a>() method of the String class:

<pre><code>String str = "xyz";
char arr[] = str.toCharArray(); // convert the String object to array of char

// iterate over the array using the for-each loop. 
for(char c: arr){
 System.out.println(c);
}
</code></pre>

blocks|key|1302526|text|如果使用Java8，可以在String上使用chars()来获取字符的Stream，但是需要将int转换回char，因为chars()返回IntStream。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1302527|"xyz".chars().forEach(i+->+System.out.print((char)i));|code-block|syntax|javascript|1302528|如果将Java8与Eclipse+Collections结合使用，则可以使用带有lambda或方法引用的CharAdapter类forEach方法来迭代String中的所有字符。|1302529|Strings.asChars("xyz").forEach(c+->+System.out.print(c));|1302530|这个特定的示例也可以使用方法引用。|1302531|Strings.asChars("xyz").forEach(System.out::print)|1302532|注意:我是Eclipse+Collections的提交者。|1302533|entityMap|0|LINK|mutability|MUTABLE|url|https://www.eclipse.org/collections/^0|D|6|M|7|Z|6|1B|3|1H|4|1O|7|1X|9|0|0|1G|B|1S|7|24|6|9|J|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1H|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]]|D|@$9|1P|A|1Q|1|1R]]|E|$]]|$1|M|3|N|5|H|7|1S|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1T|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1U|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1V|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

If you use Java 8, you can use <code>chars()</code> on a <code>String</code> to get a <code>Stream</code> of characters, but you will need to cast the <code>int</code> back to a <code>char</code> as <code>chars()</code> returns an <code>IntStream</code>.

<pre><code>"xyz".chars().forEach(i -&gt; System.out.print((char)i));
</code></pre>

If you use Java 8 with <a href="https://www.eclipse.org/collections/" rel="noreferrer">Eclipse Collections</a>, you can use the <code>CharAdapter</code> class <code>forEach</code> method with a lambda or method reference to iterate over all of the characters in a <code>String</code>.

<pre><code>Strings.asChars("xyz").forEach(c -&gt; System.out.print(c));
</code></pre>

This particular example could also use a method reference.

<pre><code>Strings.asChars("xyz").forEach(System.out::print)
</code></pre>

Note: I am a committer for Eclipse Collections.

blocks|key|1302611|text|不幸的是，Java并没有让String实现Iterable<Character>。这很容易做到。虽然有StringCharacterIterator，但它甚至没有实现Iterator...所以，做你自己的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1302612|public+class+CharSequenceCharacterIterable+implements+Iterable<Character>+{
++++private+CharSequence+cs;

++++public+CharSequenceCharacterIterable(CharSequence+cs)+{
++++++++this.cs+=+cs;
++++}

++++@Override
++++public+Iterator<Character>+iterator()+{
++++++++return+new+Iterator<Character>()+{
++++++++++++private+int+index+=+0;

++++++++++++@Override
++++++++++++public+boolean+hasNext()+{
++++++++++++++++return+index+<+cs.length();
++++++++++++}

++++++++++++@Override
++++++++++++public+Character+next()+{
++++++++++++++++return+cs.charAt(index%2B%2B);
++++++++++++}
++++++++};
++++}
}|code-block|syntax|javascript|1302613|现在您可以(在某种程度上)轻松地运行for+(char+c+:+new+CharSequenceCharacterIterable("xyz"))...|1302614|entityMap^0|D|6|L|J|1F|N|2B|8|0|0|I|1J|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|N|$]]

Unfortunately Java does not make <code>String</code> implement <code>Iterable&lt;Character&gt;</code>. This could easily be done. There is <code>StringCharacterIterator</code> but that doesn't even implement <code>Iterator</code>... So make your own:

<pre><code>public class CharSequenceCharacterIterable implements Iterable&lt;Character&gt; {
 private CharSequence cs;

 public CharSequenceCharacterIterable(CharSequence cs) {
 this.cs = cs;
 }

 @Override
 public Iterator&lt;Character&gt; iterator() {
 return new Iterator&lt;Character&gt;() {
 private int index = 0;

 @Override
 public boolean hasNext() {
 return index &lt; cs.length();
 }

 @Override
 public Character next() {
 return cs.charAt(index++);
 }
 };
 }
}
</code></pre>

Now you can (somewhat) easily run <code>for (char c : new CharSequenceCharacterIterable("xyz"))</code>...

blocks|key|1302560|text|在这种情况下，您也可以使用lambda。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302561|++++String+s+=+"xyz";
++++IntStream.range(0,+s.length()).forEach(i+->+{
++++++++char+c+=+s.charAt(i);
++++});|code-block|syntax|javascript|1302562|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can also use a lambda in this case.

<pre><code> String s = "xyz";
 IntStream.range(0, s.length()).forEach(i -&gt; {
 char c = s.charAt(i);
 });
</code></pre>

blocks|key|1087293|text|对于Traver字符串，也可以将charAt()与字符串一起使用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1087294|像这样：|1087295|String+str+=+"xyz";+//+given+String
char+st+=+str.charAt(0);+//+for+example+we+take+0+index+element+
System.out.println(st);+//+print+the+char+at+0+index+|code-block|syntax|javascript|1087296|charAt()是java中的字符串处理方法，它可以帮助遍历特定字符的字符串。|1087297|entityMap^0|G|8|0|0|0|0|8|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

For Travers an String you can also use <code>charAt()</code> with the string.

like :

<pre><code>String str = "xyz"; // given String
char st = str.charAt(0); // for example we take 0 index element 
System.out.println(st); // print the char at 0 index 
</code></pre>

<code>charAt()</code> is method of string handling in java which help to Travers the string for specific character.

So I want to iterate for each character in a string.

So I thought:

<pre><code>for (char c : "xyz")
</code></pre>

but I get a compiler error:

<pre><code>MyClass.java:20: foreach not applicable to expression type
</code></pre>

How can I do this?

How do I apply the for-each loop to every character in a String?

编译器

Eclipse

Java

所以我想对字符串中的每个字符进行迭代。所以我想：for (char c : "xyz")但是我得到了一个编译器错误：MyClass.java:20: foreach not applicable to expression type我该怎么做呢？

问如何将for-each循环应用于字符串中的每个字符？
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