Java - Why can't I use charAt() to see if a char equals another?
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