从别的地方copy来的,用着还可以。
private static final int SIZE = 6; private static final String SYMBOL = "*"; public static void main(String[] args) { String s = ""; String conceal = toConceal(s); System.out.println(conceal); } public static String toConceal(String value) { if (null == value || "".equals(value)) { return value; } int len = value.length(); int pamaone = len / 2; int pamatwo = pamaone - 1; int pamathree = len % 2; StringBuffer stringBuilder = new StringBuffer(); if (len <= 2) { if (pamathree == 1) { return SYMBOL; } stringBuilder.append(SYMBOL); stringBuilder.append(value.charAt(len - 1)); } else { if (pamatwo <= 0) { stringBuilder.append(value.substring(0, 1)); stringBuilder.append(SYMBOL); stringBuilder.append(value.substring(len - 1, len)); } else if (pamatwo >= SIZE / 2 && SIZE + 1 != len) { int pamafive = (len - SIZE) / 2; stringBuilder.append(value.substring(0, pamafive)); for (int i = 0; i < SIZE; i++) { stringBuilder.append(SYMBOL); } if ((pamathree == 0 && SIZE / 2 == 0) || (pamathree != 0 && SIZE % 2 != 0)) { stringBuilder.append(value.substring(len - pamafive, len)); } else { stringBuilder.append(value.substring(len - (pamafive + 1), len)); } } else { int pamafour = len - 2; stringBuilder.append(value.substring(0, 1)); for (int i = 0; i < pamafour; i++) { stringBuilder.append(SYMBOL); } stringBuilder.append(value.substring(len - 1, len)); } } return stringBuilder.toString(); }
来源:https://www.cnblogs.com/bchange/p/9168515.html