Java 中的 BigDecimal 乘()方法
-
The java.math.BigDecimal.multiply(BigDecimal multiplicand) is an inbuilt method in java that returns a BigDecimal whose value is (this × multiplicand), and whose scale is (this.scale() + multiplicand.scale()).
语法:
```java public BigDecimal multiply(BigDecimal multiplicand)
```
参数:该方法接受一个大十进制类型的单参数被乘数，指的是要乘以这个大十进制的值。
返回值:这个方法返回一个大十进制数，它的值这个被乘数*。
下面的程序说明了上述方法的工作: 程序 1:
```java // Java program to demonstrate the // multiply() method
import java.math.*;
public class gfg {
public static void main(String[] args) {
// Assign two BigDecimal objects BigDecimal b1 = new BigDecimal("54.2"); BigDecimal b2 = new BigDecimal("14.20");
// Multiply b1 with b2 and assign result to b3 BigDecimal b3 = b1.multiply(b2);
// Print b3 value System.out.println("Multiplication is " + b3); } } ```
Output:
```java Multiplication is 769.640
```
程序 2:
```java // Java program to demonstrate the // multiply() method
import java.math.*;
public class Gfg {
public static void main(String[] args) {
// Assign two BigDecimal objects BigDecimal b1 = new BigDecimal("-54.2"); BigDecimal b2 = new BigDecimal("14.20");
// Multiply b1 with b2 and assign result to b3 BigDecimal b3 = b1.multiply(b2);
// Print b3 value System.out.println("Multiplication is " + b3); } } ```
Output:
```java Multiplication is -769.640
```
-
The java.math.BigDecimal.multiply(BigDecimal multiplicand, MathContext mc) is an inbuilt method in Java that returns a BigDecimal whose value is (this × multiplicand), with rounding according to the context settings.
语法:
```java public BigDecimal multiply(BigDecimal multiplicand, MathContext mc)
```
参数:该方法接受两个参数:
- 被乘数–这是 BigDecimal 类型，指的是要乘以这个 BigDecimal 的值。
- MC–这是指舍入的上下文，即值要舍入到小数点后多少位。
返回值:这个方法返回一个 BigDecimal，它的值是这个*被乘数，根据需要四舍五入。
下面的程序演示了这种方法:
程序 1:
```java // Java program to demonstrate the // multiply() method import java.math.*;
public class Gfg {
public static void main(String[] args) {
// 4 precision MathContext m = new MathContext(4);
// Assign value to BigDecimal objects BigDecimal b1 = new BigDecimal("5.99"); BigDecimal b2 = new BigDecimal("4.6");
// Multiply b1 with b2 using m BigDecimal b3 = b1.multiply(b2, m);
// Print b3 value System.out.println("Multiplication is " + b3); } } ```
Output:
```java Multiplication is 27.55
```
程序 2:
```java // Java program to demonstrate the // multiply() method import java.math.*;
public class Gfg {
public static void main(String[] args) {
// 4 precision MathContext m = new MathContext(4);
// Assign value to BigDecimal objects BigDecimal b1 = new BigDecimal("-5.99"); BigDecimal b2 = new BigDecimal("4.6");
// Multiply b1 with b2 using m BigDecimal b3 = b1.multiply(b2, m);
// Print b3 value System.out.println("Multiplication is " + b3); } } ```
Output:
```java Multiplication is -27.55
```
参考:https://docs . Oracle . com/javase/7/docs/API/Java/math/bigdecimal . html #乘法(java.math.BigDecimal)
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