Why do I get the same results for both upper- and lowercase literals? For instance:
char ch1 = 'A';
char ch2 = 'a';
char ch3 = 'Z';
char ch4 = 'z';
print("ch1 -- > " + Integer.toBinaryString(Character.getNumericValue(ch1)));
print("ch2 -- > " + Integer.toBinaryString(Character.getNumericValue(ch2)));
print("ch3 -- > " + Integer.toBinaryString(Character.getNumericValue(ch3)));
print("ch4 -- > " + Integer.toBinaryString(Character.getNumericValue(ch4)));
As results I get:
ch1 -- > 1010
ch2 -- > 1010
ch3 -- > 100011
ch4 -- > 100011
And don't really see the difference between 'A' and 'a'. Even if I use character literals in UTF form (\u0041 for 'A' and \u0061 for 'a') I do get the same results.
getNumericValue(char ch) Returns the int value that the specified Unicode character represents. static int. getNumericValue(int codePoint) Returns the int value that the specified character (Unicode code point) represents.
GetNumericValue(String, Int32)Converts the numeric Unicode character at the specified position in a specified string to a double-precision floating point number.
If the char variable contains an int value, we can get the int value by calling Character. getNumericValue(char) method. Alternatively, we can use String. valueOf(char) method.
It's behaving exactly as documented:
The letters A-Z in their uppercase ('\u0041' through '\u005A'), lowercase ('\u0061' through '\u007A'), and full width variant ('\uFF21' through '\uFF3A' and '\uFF41' through '\uFF5A') forms have numeric values from 10 through 35.
Basically this means that when parsing hex (say), 0xfa == 0xFA
, as you'd expect.
I'd only expect case to matter when using something like base64.
Judging from the commentary, you're actually looking for the codepoints of the characters, rather than their numeric value, so I'll just isolate that into an answer. The getNumericValue()
function returns what the character means as a number when interpreting its glyph, it does not return the codepoint of a character. For instance, getNumericValue('5')
returns 5 as an int
, not the codepoint of 5
.
To use the codepoints, just use your variables or the char literals as they are. char
is a numeric datatype. For instance, System.out.println((int)'a');
will print 65, quite simply.
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