How to check if a char is equal to an empty space

Question

Here s what I ve got   private static int countNumChars String s        for char c   s toCharArray             if  Equals c                 But that code says it cannot find Symbol for that method  I remember Java having a comparer like this    Any suggestions

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Since char is a primitive type  you can just write c         You only need to call equals   for reference types like String or Character

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You could use   Character isWhitespace c    or any of the other available methods in the Character class       if  c           also works

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if  c           char is a primitive data type  so it can be compared with      Also  by using double quotes you create String constant        while with single quotes it s a char constant

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My suggestion would be   if  c

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To compare character you use the    operator   if  c

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To compare Strings you have to use the equals keyword    if c equals

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The code you needs depends on what you mean by  an empty space     If you mean the ASCII   Latin-1   Unicode space character  0x20  aka SP  then   if  ch                         If you mean any of the traditional ASCII whitespace characters  SP  HT  VT  CR  NL   then   if  ch           ch      t     ch      r     ch      n     ch      x0b                   If you mean any Unicode whitespace character  then   if  Character isWhitespace ch                     Note that there are Unicode whitespace includes additional ASCII control codes  and some other Unicode characters in higher code planes  see the javadoc for Character isWhitespace char      What you wrote was this       if  Equals ch                                 This is wrong on a number of levels   Firstly  the way that the Java compiler tries to interpret that is as a call to a method with a signature of boolean Equals char  String       This is wrong because no method exists  as the compiler reported in the error message  Equals wouldn t normally be the name of a method anyway   The Java convention is that method names start with a lower case letter  Your code  as written  was trying to compare a character and a String  but char and String are not comparable and cannot be cast to a common base type    There is such a thing as a Comparator in Java  but it is an interface not a method  and it is declared like this       public interface Comparator lt T gt            public int compare T v1  T v2           In other words  the method name is compare  not Equals   it returns an integer  not a boolean   and it compares two values that can be promoted to the type given by the type parameter     Someone  in a deleted Answer   said they tried this       if  c           That fails for two reasons        is a String literal and not a character literal  and Java does not allow direct comparison of String and char values  You should NEVER compare Strings or String literals using      The    operator on a reference type compares object identity  not object value   In the case of String it is common to have different objects with different identity and the same value   An    test will often give the wrong answer     from the perspective of what you are trying to do here

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In this case  you are thinking of the String comparing function  String  equals  some text    Chars do not need to use this function  Instead a standard    comparison operator will suffice   private static int countNumChars String s        for char c   s toCharArray             if  c            your resulting outcome

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You can try   if Character isSpaceChar ch            Do something        Or   if  int  ch     32           Do something

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At first glance  your code will not compile  Since the nested if statement doesn t have any braces  it will consider the next line the code that it should execute  Also  you are comparing a char against a String       Try comparing the values as chars instead  I think the correct syntax would be   if c               do something here     But then again  I am not familiar with the  Equal  class

User · Answer

Character isSpaceChar c     Character isWhitespace c  worked for me

[java] How to check if a char is equal to an empty space?

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