Java ASCII Table

ASCII stands for American Standard Code for Information Interchange. ASCII is a standard data-transmission code that is used by the computer for representing both the textual data and control characters.

ASCII is a 7-bit character set having 128 characters, i.e., from 0 to 127. ASCII represents a numeric value for each character, such as 65 is a value of A. In our Java program, we need to manipulate characters that are stored in ASCII.

In Java, an ASCII table is a table that defines ASCII values for each character. It is also a small subset of Unicode because it contains 2 bytes while ASCII requires only one byte.

ASCII Value	Decimal Value	Hex value
Control	0	0
Control	1	1
Control	2	2
Control	3	3
Control	4	4
Control	5	5
Control	6	6
Control	7	7
Control	8	8
\t	9	9
\n	10	A
Whitespace	11	B
\f	12	C
\r	13	D
Control	14	E
Control	14	F
Control	16	10
Control	17	11
Control	18	12
Control	19	13
Control	20	14
Control	21	15
Control	22	16
Control	23	17
Control	24	18
Control	25	19
Control	26	1a
Control	27	1b
Whitespace	28	1c
Whitespace	29	1d
Whitespace	30	1e
Whitespace	31	1f
space	32	20
!	33	21
"	34	22
#	35	23
$	36	24
%	37	25
&	38	26
'	39	27
(	40	28
)	41	29
*	42	2a
+	43	2b
,	44	2c
-	45	2d
.	46	2e
/	47	2f
0	48	30
1	49	31
2	50	32
3	51	33
4	52	34
5	53	35
6	54	36
7	55	37
8	56	38
9	57	39
:	58	3a
;	59	3b
<	60	3c
=	61	3d
>	62	3e
?	63	3f
@	64	40
A	65	41
B	66	42
C	67	43
D	68	44
E	69	45
F	70	46
G	71	47
H	72	48
I	73	49
J	74	4a
K	75	4b
L	76	4c
M	77	4d
N	78	4e
O	79	4f
P	80	50
Q	81	51
R	82	52
S	83	53
T	84	54
U	85	55
V	86	56
W	87	57
X	88	58
Y	89	59
Z	90	5a
[	91	5b
\	92	5c
]	93	5d
^	94	5e
_	95	5f
`	96	60
a	97	61
b	98	62
c	99	63
d	100	64
e	101	65
f	102	66
g	103	67
h	104	68
i	105	69
j	106	6a
k	107	6b
l	108	6c
m	109	6d
n	110	6e
o	111	6f
p	112	70
q	113	71
r	114	72
s	115	73
t	116	74
u	117	75
v	118	76
w	119	77
x	120	78
y	121	79
z	122	7a
{	123	7b
\|	124	7c
}	125	7d
~	126	7e
control	127	7f

Let's create a Java program for constructing the above ASCII table. In the Java program, we use the isWhitespace() method of the character for determining whether a character is a whitespace or not. We also use the built-in method IsISOControl() method for detecting characters that are not letters, digits and punctuation.

ASCIITable.java

//import required classes and packages 
package javaTpoint.MicrosoftJava;
//create class ASCIITableExample
public class FindCommonElements {
	// main() method start
	public static void main(String[] args) {
	    // design header for the ASCII Table
        System.out.printf("%1$-8s %2$-10s %3$s\n", "Decimal", "ASCII", "Hex");
        // use for loop to print all possible ASCII values
        // set value for min and max ASCII values
        int min = 0;
        int max = 128;
        //for loop
        for (int i = min; i < max; i++) {
            // convert each value into character
        	char ch = (char) i;
            String display = "";
            // check whether character is whitespace or not
            if (Character.isWhitespace(ch)) {
            	// using switch statement
                switch (ch) {
                	case '\r':
                		display = "\\r";
                		break;
	                case '\t':
	                    display = "\\t";
	                    break;
	                case '\n':
	                    display = "\\n";
	                    break;
	                case '\f':
	                    display = "\\f";
	                    break;
	                case ' ':
	                    display = "space";
	                    break;
	                default:
	                	display = "whitespace";
	                	break;
                }
                // detect characters that are not letters, digits and punctuation 
            } else if (Character.isISOControl(ch)) {
                // showing control chars
                display = "control";
            } else {
                // showing others chars
                display = Character.toString(ch);
            }
            System.out.printf("%1$-8d %2$-10s %3$s\n", i, display, Integer.toHexString(i));
        }
    }
}

Output: