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71 lines (60 loc) · 1.82 KB
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package math;
import java.math.BigDecimal;
/**
* Created by yahier on 12/5/18.
*/
public class TwoDecimalTest {
public static void main(String[] args) {
//get2Decimal(saveTwoDecimal(0));
//get2Decimal(saveTwoDecimal(1.1));
get2Decimal(saveTwoDecimal(1.11));
//get2Decimal(saveTwoDecimal(1.111));
get2Decimal("3");
get2Decimal("3.1");
get2Decimal("3.22");
get2Decimal("3.333");
get2Decimal("3.4444");
}
/**
* 保留两位小数(向上取整)
* 适用于回收端
*/
public static String saveTwoDecimal(double value) {
Double num = 0.0;
BigDecimal bd = null;
try {
bd = BigDecimal.valueOf(value);
bd = bd.setScale(2, BigDecimal.ROUND_UP);
} catch (Exception e) {
e.printStackTrace();
}
if (bd != null) {
num = bd.doubleValue();
}
String newNum = String.valueOf(num);
System.out.println(String.format("old=%s|new=%s", value, newNum));
return newNum;
}
/**
* 转换成 带两位小数
* 没有小数或者位数不够时，进行填充;过长，则截取
*/
private static String get2Decimal(String source) {
int indexPoint = source.indexOf(".");
int length = source.length();
if (indexPoint < 0) {
source = source + ".00";
} else if (indexPoint >= 0) {
int addZeroSize = 3 - (length - indexPoint);
if (addZeroSize >= 0) {
for (int i = 0; i < addZeroSize; i++) {
source = source + "0";
}
} else {
source = source.substring(0, indexPoint + 3);
}
}
System.out.println("result:" + source);
return source;
}
}