如何在java中将整数转换为bigdecimal

问题描述：

我想创建一种计算整数和大十进制乘法的方法. 我在Google和论坛上搜索没有找到我的东西.

I want to create a method that caculates multiplication an integer and a bigdecimal. I search on google and forums nothing I found.

import java.math.BigDecimal;
private Integer quantite;
private BigDecimal prixUnit;

public Integer getQuantite() {
        return quantite;
    }

    public void setQuantite(Integer quantite) {
        this.quantite = quantite;
    }


    public BigDecimal getPrixUnit() {
        return prixUnit;
    }

    public void setPrixUnit(BigDecimal prixUnit) {
        this.prixUnit = prixUnit;
    }

public BigDecimal methCal(BigDecimal quantite, BigDecimal prixUnit){

        this.prixUnit=prixUnit;
        BigDecimal j = new BigDecimal(quantite);
        this.j = quantite;

        return quantite*prixUnit ;
}

有人可以帮助我吗?

答

要将整数(或字节/短/浮点数/双精度数)与BigInteger(或BigDecimal)相乘，必须先将本机数字转换为BigInteger/BigDecimal

To multiply an integer (or byte/short/float/double) with a BigInteger (or BigDecimal), you must convert the native number to BigInteger/BigDecimal first.

// int parameter can be int or Integer
public static BigInteger multiply ( int a, BigInteger b ) {
   return BigInteger.valueOf( a ).multiply( b );
}

// BigInteger <> BigDecimal
public static BigDecimal multiply ( int a, BigDecimal b ) {
   return BigDecimal.valueOf( a ).multiply( b );
}

// same for add, subtract, divide, mod etc.

注意:valueOf与new不同，并且出于不同的原因在 BigInteger . 在这两种情况下，我建议valueOf胜过new.

Note: valueOf is not the same as new, and for different reasons on BigDecimal and BigInteger. In both cases, I recommend valueOf over new.

我看到您添加了代码，很好. 它不起作用，因为Integer与BigDecimal混合使用，并且*也不适用于BigDecimal. 如果将其与我的代码进行比较，则修复应该很明显:

I see that you added your code, nice. It doesn't work because Integer is mixed with BigDecimal, and also * does not work with BigDecimal. If you compare it with my code, the fix should be obvious:

public BigDecimal methCal ( int quantite, BigDecimal prixUnit ) {
    return BigDecimal.valueOf( quantite ).multiply( prixUnit );
}

如何在java中将整数转换为bigdecimal

相关推荐