Converting String to int in java

Question

I need to convert a string to a corresponding int array in java. i wrote the following code but its not working as i expected .

        String temp= "abc1";
        int[] intArray = new int[temp.length()];
        for (int i = 0; i < temp.length(); i++) {
            intArray[i] = Integer.parseInt(temp[i]);
        }

I have written an rc4 encryption program which take the key and plain text as int arrays. So I need to convert the user specified key to int array before passing it to the encryption function. Is this the correct way of using key in encryption programs?

What do you expect when converting 'a' to int? A hexadecimal value? The ASCII code? — Vincent van der Weele, Mar 15 '13 at 12:57
Why don't you use the built-in RC4 algorithm of the JDK? And why use ints instead of bytes? — JB Nizet, Mar 15 '13 at 13:00
temp is a string ...not an array...Even if it were an array of strings..you would get a NumberFormatException — mvlupan, Mar 15 '13 at 13:00
"_Is this the correct way[...]?_" **No**, it has compiler errors, so no, it is not the correct way. — jlordo, Mar 15 '13 at 13:07
http://stackoverflow.com/questions/7443975/how-can-i-get-ascii-value-at-input-word — Jeff Hawthorne, Mar 15 '13 at 13:07

score 3 · Answer 1 · answered Mar 15 '13 at 13:00

3

Use this to get the ASCII code

intArray[i] = (int)temp.charAt(i);

answered Mar 15 '13 at 13:00

mprivat

21,582
4
54
64

score 0 · Answer 2 · answered Mar 15 '13 at 13:02

0

You can convert string to charArray. Travesing charArray you can convert as:

char[] c = inputString.toCharArray()
for(int i=0;i<c.length;i++)
     int n    = Integer.parseInt(c[i]);

answered Mar 15 '13 at 13:02

Bhavesh Shah

3,299
11
49
73

score 0 · Answer 3 · answered Nov 03 '18 at 21:41

0

if you are Using Java8 or higher then it might be helpful for you

String temp="abc1";
int[] intArray =temp.chars().map(x->x-'0').toArray();
System.out.println(Arrays.toString(intArray ));

int array would be [49, 50, 51, 1]

answered Nov 03 '18 at 21:41

Deepesh Kumar

59
5

score -1 · Answer 4 · answered Mar 15 '13 at 13:29

-1

I solved this by using byte instead of int. Modified the rc4 to take byte array. converted the string to byte using

    String Nkey = jTextField2.getText();
    jTextField3.setText(Nkey);
    int i;
    byte[] key = Nkey.getBytes();

answered Mar 15 '13 at 13:29

Amar C

374
5
17

Converting String to int in java

4 Answers4