How to convert a char to a String

Question

I have a char and I need a String  How do I convert from one to the other

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Below are various ways to convert to char c to String s  in decreasing order of speed and efficiency   char c    a   String s   String valueOf c                  fastest   memory efficient String s   Character toString c   String s   new String new char   c    String s   String valueOf new char   c    String s   new Character c  toString    String s        c                            slowest   memory inefficient

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As  WarFox stated - there are 6 methods to convert char to string  However  the fastest one would be via concatenation  despite answers above stating that it is String valueOf  Here is benchmark that proves that    BenchmarkMode Mode Throughput   Fork 1   State Scope Thread   Warmup iterations   10  time   1  batchSize   1000  timeUnit   TimeUnit SECONDS   Measurement iterations   10  time   1  batchSize   1000  timeUnit   TimeUnit SECONDS  public class CharToStringConversion        private char c    c         Benchmark     public String stringValueOf             return String valueOf c               Benchmark     public String stringValueOfCharArray             return String valueOf new char   c                Benchmark     public String characterToString             return Character toString c               Benchmark     public String characterObjectToString             return new Character c  toString                Benchmark     public String concatBlankStringPre             return c                   Benchmark     public String concatBlankStringPost             return      c              Benchmark     public String fromCharArray             return new String new char   c              And result   Benchmark                                        Mode  Cnt       Score      Error  Units CharToStringConversion characterObjectToString  thrpt   10   82132 021    6841 497  ops s CharToStringConversion characterToString        thrpt   10  118232 069    8242 847  ops s CharToStringConversion concatBlankStringPost    thrpt   10  136960 733    9779 938  ops s CharToStringConversion concatBlankStringPre     thrpt   10  137244 446    9113 373  ops s CharToStringConversion fromCharArray            thrpt   10   85464 842    3127 211  ops s CharToStringConversion stringValueOf            thrpt   10  119281 976    7053 832  ops s CharToStringConversion stringValueOfCharArray   thrpt   10   86563 837    6436 527  ops s   As you can see  the fastest one would be c      or      c   VM version  JDK 1 8 0 131  VM 25 131-b11   This performance difference is due to -XX  OptimizeStringConcat optimization  You can read about it here

User · Answer

Here are a few methods  in no particular order   char c    c    String s   Character toString c      Most efficient way  s   new Character c  toString       Same as above except new Character objects needs to be garbage-collected  s   c          Least efficient and most memory-inefficient  but common amongst beginners because of its simplicity  s   String valueOf c      Also quite common  s   String format   c   c      Not common  Formatter formatter   new Formatter    s   formatter format   c   c  toString       Same as above formatter close

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char vIn    A     String vOut   Character toString vIn     For these types of conversion  I have site bookmarked called https   www converttypes com  It helps me quickly get the conversion code for most of the languages I use

User · Answer

Use the Character toString   method like so   char mChar    l   String s   Character toString mChar

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Try this  Character toString aChar  or just this  aChar

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We have various ways to convert a char to String  One way is to make use of static method toString   in Character class   char ch    I    String str1   Character toString ch     Actually this toString method internally makes use of valueOf method from String class which makes use of char array   public static String toString char c        return String valueOf c       So second way is to use this directly   String str2   String valueOf ch     This valueOf method in String class makes use of char array   public static String valueOf char c            char data      c           return new String data  true       So the third way is to make use of an anonymous array to wrap a single character and then passing it to String constructor   String str4   new String new char   ch      The fourth way is to make use of concatenation   String str3        ch    This will actually make use of append method from StringBuilder class which is actually preferred when we are doing concatenation in a loop

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You can use Character toString char   Note that this method simply returns a call to String valueOf char   which also works   As others have noted  string concatenation works as a shortcut as well   String s         s     But this compiles down to   String s   new StringBuilder   append     append  s   toString      which is less efficient because the StringBuilder is backed by a char    over-allocated by StringBuilder   to 16   only for that array to be defensively copied by the resulting String   String valueOf char   gets in the back door  by wrapping the char in a single-element array and passing it to the package private constructor String char    boolean   which avoids the array copy

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I am converting Char Array to String  Char   CharArray    A    B    C    String text   String copyValueOf CharArray

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I ve tried the suggestions but ended up implementing it as follows  editView setFilters new InputFilter   new InputFilter                          Override             public CharSequence filter CharSequence source  int start  int end                                         Spanned dest  int dstart  int dend                                String prefix    http                         make sure our prefix is visible                 String destination   dest toString                       Check If we already have our prefix - make sure it doesn t                   get deleted                 if  destination startsWith prefix   amp  amp   dstart  lt   prefix length   - 1                                           Yep - our prefix gets modified - try preventing it                      int newEnd    dend  gt   prefix length      dend   prefix length                         SpannableStringBuilder builder   new SpannableStringBuilder                              destination substring dstart  newEnd                        builder append source                       if  source instanceof Spanned                                                TextUtils copySpansFrom                                   Spanned  source  0  source length    null  builder  newEnd                                              return builder                                    else                                         Accept original replacement  by returning null                      return null

User · Answer

Nice question  I ve got of the following five 6 methods to do it       1 String stringValueOf   String valueOf  c       most efficient      2 String stringValueOfCharArray   String valueOf new char   x         3 String characterToString   Character toString  c         4 String characterObjectToString   new Character  c   toString         5       Although this method seems very simple         this is less efficient because the concatenation       expands to new StringBuilder   append x  append     toString    String concatBlankString    c             6 String fromCharArray   new String new char   x         Note  Character toString char  returns String valueOf char   So effectively both are same    String valueOf char   value  invokes new String char   value   which in turn sets the value char array   public String char value          this value   Arrays copyOf value  value length       On the other hand String valueOf char value  invokes the following package private constructor   String char   value  boolean share           assert share    unshared not supported       this value   value      Source code from String java in Java 8 source code     Hence String valueOf char  seems to be most efficient method  in terms of both memory and speed  for converting char to String     How to convert primitive char to String in Java How to convert Char to String in Java with Example

User · Answer

Use any of the following   String str   String valueOf  c    String str   Character toString  c    String str    c

[java] How to convert a char to a String?

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