bigdecimal乘法_Java BigDecimal乘法（）方法与示例

bigdecimal乘法

BigDecimal类的multiple()方法 (BigDecimal Class multiply() method)

Syntax:

句法：

 public BigDecimal multiply(BigDecimal m_val); public BigDecimal multiply(BigDecimal m_val, MathContext ma_co);  

• multiply() method is available in java.math package.

  java.math包中提供了multiple ()方法 。

• multiply(BigDecimal m_val) method is used get a BigDecimal that holds the value multiplied this BigDecimal by the given BigDecimal and its scale is calculated by using ([this BigDecimal.scale()] * [BigDecimal m_val.scale()]).

  使用乘法(BigDecimal m_val)方法来获取一个BigDecimal，该BigDecimal保留该BigDecimal乘以给定的BigDecimal的值，并使用([thisBigDecimal.scale()] * [BigDecimal m_val.scale()])计算其小数位数。

• multiply(BigDecimal m_val, MathContext ma_co) method is used to get a BigDecimal that holds the value multiplied this BigDecimal by the given BigDecimal based on the given MathContext settings.

  乘法(BigDecimal m_val，MathContext ma_co)方法用于获取一个BigDecimal，该BigDecimal包含基于给定MathContext设置将此BigDecimal乘以给定BigDecimal的值。

• These methods may throw an exception at the time of multiplied an object.

  这些方法在对象相乘时可能会引发异常。

  ArithmeticException: This exception may throw when the result is not accurate and set the rounding mode “UNNECESSARY”.

  ArithmeticException ：当结果不正确并且将舍入模式设置为“ UNNECESSARY”时，可能会引发此异常。

• These are non-static methods and it is accessible with class objects and if we try to access these methods with the class name then we will get an error.

  这些是非静态方法，可通过类对象访问，如果尝试使用类名访问这些方法，则会收到错误消息。

Parameter(s):

参数：

• In the first case, multiply(BigDecimal m_val),

  在第一种情况下， 乘以(BigDecimal m_val) ，

  • BigDecimal m_val – represents the object is used to multiply this BigDecimal object.
  • BigDecimal m_val –表示用于将这个BigDecimal对象相乘的对象。
• In the first case, multiply(BigDecimal m_val, MathContext ma_co),

  在第一种情况下， 乘法(BigDecimal m_val，MathContext ma_co) ，

  • BigDecimal m_val – Similar as defined in the first case.
  • BigDecimal m_val –与第一种情况下定义的相似。
  • MathContext ma_co – represents the context setting to use in rounding.
  • MathContext ma_co –表示要舍入的上下文设置。

Return value:

返回值：

In both the cases, the return type of the method is BigDecimal,

在这两种情况下，方法的返回类型均为BigDecimal 。

• In the first case, it returns the multiplied result of both the objects without rounding.

  在第一种情况下，它返回两个对象的相乘结果而不进行舍入。

• In the second case, it returns the multiplied result of both the objects with rounding if required.

  在第二种情况下，如果需要，它将使用舍入返回两个对象的相乘结果。

Example:

例：

// Java program to demonstrate the example // of multiply() method of BigDecimal import java.math.*; public class MultiplyOfBD { 
    public static void main(String args[]) { 
    // Initialize three variables val1, // val2 and mul_val String val1 = "10.30"; int val2 = 4; String mul_val = "5"; // Initialize three BigDecimal objects and // one MathContext BigDecimal b_dec1 = new BigDecimal(val1); BigDecimal b_dec2 = new BigDecimal(val2); BigDecimal b_dec3 = new BigDecimal(mul_val); MathContext ma_co = new MathContext(2, RoundingMode.CEILING); System.out.println("multiply(BigDecimal): "); // multiplies this BigDecimal (b_dec2) by the // given BigDecimal (b_dec3) and return the result BigDecimal mul_res = b_dec2.multiply(b_dec3); System.out.println("b_dec2.multiply(b_dec3): " + mul_res); System.out.println(" "); System.out.println("multiply(BigDecimal,MathContext): "); // multiplies this BigDecimal (b_dec1) by the // given BigDecimal (b_dec3) and return the result based // on the given context settings mul_res = b_dec1.multiply(b_dec3, ma_co); System.out.println("b_dec1.multiply(b_dec3, ma_co): " + mul_res); } }  

Output

输出量

multiply(BigDecimal): b_dec2.multiply(b_dec3): 20 multiply(BigDecimal,MathContext): b_dec1.multiply(b_dec3, ma_co): 52  

翻译自: https://www.includehelp.com/java/bigdecimal-multiply-method-with-example.aspx

bigdecimal乘法