I want to see if a character in my string equals a certain other char value but I do not know what the char in the string is so I have used this:
if ( fieldNames.charAt(4) == "f" )
But I get the error:
"Operator '==' cannot be applied to 'char', 'jav.lang.String'"
But "g" == "h" seems to work and I know you can use '==' with char types.
Is there another way to do this correctly? Thanks!
Advertisement
Answer
if ( fieldNames.charAt(4) == 'f' )
because "f" is a String and fieldNames.charAt(4) is a char. you should use 'f' for check char
"g" == "h" works because both g and h are Strings
and you shouldn’t use "g" == "h" you should use "g".equals("h") instead .
you can use == for primitive data types like char,int,boolean….etc.but for the objects like String it’s really different.
To know why read this
but you can use also
'g' == 'h'
you should wrap Strings by double quotation and char by single quotation
String s="g"; char c='g';
but char can only have one character but String can have more than one
String s="gg"; valid char c='gg'; not valid