自定义数字的取舍！

来源：互联网发布：淘宝网页版编辑：程序博客网时间：2024/04/29 11:27

若个位数及小数小于2.5，则去掉各位数

若个位数及小数大于2.5且小于7.5，则各位数为5

若个位数及小数大于7.5，则十位数进一位

public static double getResource(double num){String numStr = num + "";int beginIndex = numStr.indexOf(".");String middleOldStr;String middleNewStr;middleOldStr = numStr.substring(beginIndex-1, beginIndex + 2);double numDouble = Double.valueOf(middleOldStr);boolean add = false;if (numDouble <= 2.5) {middleNewStr = "0.";}else if (numDouble<= 7.5) {middleNewStr = "5.";}else {middleNewStr = "0.";add = true;}numStr = numStr.replace(middleOldStr, middleNewStr);numStr = numStr.split("//.")[0];if (add) return Double.valueOf(numStr) + 10;return Double.valueOf(numStr);}public static void main(String[] args) {System.out.println(getResource(333.22));System.out.println(getResource(331.32));System.out.println(getResource(337.62));System.out.println(getResource(123.456));}

335.0
330.0
340.0
125.0