數字格式 - Java

Question

我需要轉換整數，以便在兩個字符之後插入短劃線，例如12-34-56。

整數將是一個隨機生成的六位數字。

Answer 1

int num = 123456; 
    char digits[] = Integer.toString(num).toCharArray(); 
    String what_you_want = ""; 
    for (int i = 0; i < digits.length; i += 2) { 
     what_you_want += digits[i] + "" + digits[i + 1] + ((i < 4) ? "-" : ""); 
    } 
    System.out.println(what_you_want);// output: 12-34-56 

Answer 2

int num = 123456; 
String result = String.format("%02d-%02d-%02d", 
    (num/10000), (num%10000/100), (num%100));