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

Question

So I want to iterate for each character in a string   So I thought   for  char c    xyz     but I get a compiler error   MyClass java 20  foreach not applicable to expression type   How can I do this

User · Accepted Answer

The easiest way to for-each every char in a String is to use toCharArray     for  char ch   xyz  toCharArray          This gives you the conciseness of for-each construct  but unfortunately String  which is immutable  must perform a defensive copy to generate the char    which is mutable   so there is some cost penalty   From the documentation       toCharArray   returns  a newly allocated character array whose length is the length of this string and whose contents are initialized to contain the character sequence represented by this string    There are more verbose ways of iterating over characters in an array  regular for loop  CharacterIterator  etc  but if you re willing to pay the cost toCharArray   for-each is the most concise

User · Answer

For Travers an String you can also use charAt   with the string   like    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    charAt   is method of string handling in java which help to Travers the string for specific character

User · Answer

Another useful solution  you can work with this string as array of String  for  String s    xyz  split            System out println s

User · Answer

String s    xyz   for int i   0  i  lt  s length    i         char c   s charAt i        nbsp

User · Answer

You can also use a lambda in this case       String s    xyz       IntStream range 0  s length    forEach i - gt            char c   s charAt i

User · Answer

You need to convert the String object into an array of char using the toCharArray   method of the String class   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

User · Answer

In Java 8 we can solve it as   String str    xyz   str chars   forEachOrdered i - gt  System out print  char i          The method chars   returns an IntStream as mentioned in doc      Returns a stream of int zero-extending the char values from this   sequence  Any char which maps to a surrogate code point is passed   through uninterpreted  If the sequence is mutated while the stream is   being read  the result is undefined    Why use forEachOrdered and not forEach    The behaviour of forEach is explicitly nondeterministic where as the forEachOrdered performs an action for each element of this stream  in the encounter order of the stream if the stream has a defined encounter order  So forEach does not guarantee that the order would be kept  Also check this question for more   We could also use codePoints   to print  see this answer for more details

User · Answer

Unfortunately Java does not make String implement Iterable lt Character gt    This could easily be done   There is StringCharacterIterator but that doesn t even implement Iterator     So make your own   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                                        Now you can  somewhat  easily run for  char c   new CharSequenceCharacterIterable  xyz

User · Answer

If you use Java 8  you can use chars   on a String to get a Stream of characters  but you will need to cast the int back to a char as chars   returns an IntStream    xyz  chars   forEach i - gt  System out print  char i      If you use Java 8 with Eclipse Collections  you can use the CharAdapter class forEach method with a lambda or method reference to iterate over all of the characters in a String   Strings asChars  xyz   forEach c - gt  System out print c      This particular example could also use a method reference   Strings asChars  xyz   forEach System out  print    Note  I am a committer for Eclipse Collections

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

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