将字符串字符分组为给定长度

Question

I have written a simple code that groups a certain string into N length then print it out to the console where the group of characters are divided by "|" character. Is there a simpler way to do this? By the way, this is my code.

String d = "stackoverflow.com";
char[] x = d.toCharArray();
StringBuilder ad = new StringBuilder();
int r = 0;
int f = 6;
/*
f = 1; 2 characters by group
f = 2; 3 characters by group
...
f = n; (n+1) characters by group
*/
for (char a : x) {
    if (r == f) {
        ad.append(a);
        System.out.print(ad+"|");
        ad.delete(0, 1);
    } else {
        ad.append(a);
        r++;
    } 
}

Its output will be (f = 6)

stackov|tackove|ackover|ckoverf|koverfl|overflo|verflow|erflow.|rflow.c|flow.co|low.com|

Answer 1

If you wrap System.out in a PrintWriter , you can use the overload of PrintWriter.write which prints a portion of the string:

PrintWriter pw = new PrintWriter(System.out, true);
for (int i = 0; i <= d.length() - f; ++i) {
  pw.write(d, i, f);
  pw.print('|');
}