将字符串转换为双精度 - Java

2022-01-15 00:00:00 format java

将带逗号的字符串数字(例如:835,111.2)转换为 Double 实例的最简单和正确的方法是什么.

What is the easiest and correct way to convert a String number with commas (for example: 835,111.2) to a Double instance.

谢谢.

推荐答案

看看java.text.NumberFormat.例如:

import java.text.*;
import java.util.*;

public class Test
{
    // Just for the sake of a simple test program!
    public static void main(String[] args) throws Exception
    {
        NumberFormat format = NumberFormat.getInstance(Locale.US);

        Number number = format.parse("835,111.2");
        System.out.println(number); // or use number.doubleValue()
    }
}

根据您使用的数量类型，您可能希望改为解析为 BigDecimal.最简单的方法可能是:

Depending on what kind of quantity you're using though, you might want to parse to a BigDecimal instead. The easiest way of doing that is probably:

BigDecimal value = new BigDecimal(str.replace(",", ""));

或使用 DecimalFormat 与 setParseBigDecimal(true):

DecimalFormat format = (DecimalFormat) NumberFormat.getInstance(Locale.US);
format.setParseBigDecimal(true);
BigDecimal number = (BigDecimal) format.parse("835,111.2");

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