Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    public static String formatBankCardNumbers(String number) {
        if (number.length() == 16) {
            return number.substring(0, 4) + " **** **** " + number.substring(13, 16);
        } else {
            return number;
        }
    }
}