无法将Double数字放入BigDecimal变量中 [英] Can't put Double number in BigDecimal variable

问题描述

我正在使用一个Double变量来保存商品价格.该变量存储在postgresql数据库中的money类型列下.我使用setBigDecimal(position，value)SQL函数.另一方面，我使用JSpinner作为输入.

I'm using a Double variable which holds the Item price. That variable is stored in postgresql database under a column of money type. I use setBigDecimal(position,value) SQL function.In other part, i'm using a JSpinner as input.

Double current = 0.0;
Double min = (double) Integer.MIN_VALUE;
Double max = (double) Integer.MAX_VALUE;
Double step = 0.1;

JSpinner priceSpinner = new JSpinner(new SpinnerNumberModel(current, min, max, step));

当用户单击按钮时，我得到了用户输入的值，并通过SQL查询将其放入数据库中.

When the user clicks on a button, I get the value entred by the user and put it in the database via SQL query.

 insertStmt.setBigDecimal(position,BigDecimal.valueOf((double) priceSpinner.getValue()));

但是，我遇到了这个小错误，

But, i got this little error,

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Double

推荐答案

该程序说明Double和BigDecimal之间的双向转换:

This program illustrates conversion in both directions between Double and BigDecimal:

import java.math.BigDecimal;

public class Test {
  public static void main(String[] args) {
    Double d1 = 1.3;
    BigDecimal bd1 = BigDecimal.valueOf(d1.doubleValue());
    Double d2 = bd1.doubleValue();
    System.out.println(d2);
  }
}

请注意，转换为Double可能不准确.

Note that the conversion to Double may not be exact.

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