Main.java Source code

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Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    public static String formatCardId(String cardId) {
        StringBuffer sb = new StringBuffer();

        if (cardId != null && cardId.length() > 0) {
            for (int i = 0; i < cardId.length(); i++) {
                sb.append(cardId.substring(i, i + 1));
                if (i >= 3 && (i - 3) % 4 == 0 && i != cardId.length() - 1) {
                    sb.append(" ");
                }
            }
        }

        return sb.toString();
    }
}