客户余额规模作为其货币的指数

发布于 2024-12-18 11:22:34 字数 641 浏览 0 评论 0原文

我在 java hibernate 项目

货币类下有 2 个类，其中包含变量（指数）和 (BigDecimal) DataType

具有变量（余额）和（BigDecimal）数据类型的客户类

我想将余额规模设置为指数

示例：

1) if exponent = 2, and balance = 230.1340098 then balance must be 230.13
2) if exponent = 1, and balance = 230.1340098 then balance must be 230.1
3) if exponent = 3, and balance = 230.1340098 then balance must be 230.134
4) if exponent = 0, and balance = 230.1340098 then balance must be 230
....
....
....

我该怎么做？

我的意思是我想将客户余额规模作为其货币的指数

注意： 我尝试 BigDecimal.setScale() 但此方法需要常量整数字段 dataType，其中指数为 BigDecimal 且可变

原文

i have 2 classes under java hibernate project

currency class with variable (exponent) with (BigDecimal) DataType

customer class with variable (balance) with (BigDecimal) DataType

i want to set scale of balance as exponent

example:

1) if exponent = 2, and balance = 230.1340098 then balance must be 230.13
2) if exponent = 1, and balance = 230.1340098 then balance must be 230.1
3) if exponent = 3, and balance = 230.1340098 then balance must be 230.134
4) if exponent = 0, and balance = 230.1340098 then balance must be 230
....
....
....

how can i do this?

what's i mean i want to put the customer balance scale as the exponent of his currency

Note: i try BigDecimal.setScale() but this method required constant integer field dataType where exponent is BigDecimal and variable

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说好的呢 2024-12-25 11:22:34

BigDecimal#setScale(...) 应该可以工作：

BigDecimal balance = BigDecimal.valueOf(  230.1340098 );  
BigDecimal exponent = new BigDecimal( 2 ) ; //randomly chosen
BigDecimal rounded = balance.setScale( exponent.intValue(), RoundingMode.HALF_UP ) ); //you can use another rounding mode

这会产生 rounded = 230.13。

BigDecimal#setScale(...) should work:

BigDecimal balance = BigDecimal.valueOf(  230.1340098 );  
BigDecimal exponent = new BigDecimal( 2 ) ; //randomly chosen
BigDecimal rounded = balance.setScale( exponent.intValue(), RoundingMode.HALF_UP ) ); //you can use another rounding mode

This yields rounded = 230.13.

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你列表最软的妹 2024-12-25 11:22:34

您应该从 exponent-BigDecimal 中提取整数值并将其用作 setScale 的参数。请注意，您必须设置 RoundingMode：

    BigDecimal bd = new BigDecimal("230.1340098");
    BigDecimal exponent;
    exponent = new BigDecimal("0");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));
    exponent = new BigDecimal("1");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));
    exponent = new BigDecimal("2");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));
    exponent = new BigDecimal("3");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));

You should extract the integer-value from the exponent-BigDecimal and use that as parameter to setScale. Be aware, that you have to set a RoundingMode:

    BigDecimal bd = new BigDecimal("230.1340098");
    BigDecimal exponent;
    exponent = new BigDecimal("0");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));
    exponent = new BigDecimal("1");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));
    exponent = new BigDecimal("2");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));
    exponent = new BigDecimal("3");
    System.out.println(bd.setScale(exponent.intValue(), RoundingMode.HALF_UP));

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┼── 2024-12-25 11:22:34

您可以在 BigDecimal 上调用 intValue() 来获得所需的结果。

代码片段：

private void testBigDecimal(BigDecimal exponent, double balance){
    BigDecimal finalOutput = new BigDecimal(balance);
    finalOutput = finalOutput.setScale(exponent.intValue(), BigDecimal.ROUND_CEILING);
    System.out.println(finalOutput.doubleValue());
}

You can call intValue() on BigDecimal to get the desired result.

Code snippet:

private void testBigDecimal(BigDecimal exponent, double balance){
    BigDecimal finalOutput = new BigDecimal(balance);
    finalOutput = finalOutput.setScale(exponent.intValue(), BigDecimal.ROUND_CEILING);
    System.out.println(finalOutput.doubleValue());
}

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