Java 中的 BigDecimal 求反()函数
原文:https://www . geesforgeks . org/big decimal-否定-java 中的函数/
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The java.math.BigDecimal.negate() method returns a BigDecimal whose value is the negated value of the BigDecimal with which it is used.
语法:
java public BigDecimal negate()参数:该方法不取任何参数。
返回值:该方法返回 BigDecimal 对象的负值，其小数位数为 this.scale()。
下面的程序将举例说明 Java . math . bigdecimal . invoke()函数的使用: 程序 1 :
```java // Java program to demonstrate negate() method import java.math.*;
public class GFG {
public static void main(String[] args) {
// Create a BigDecimal object BigDecimal num;
// Assign value to num num = new BigDecimal("4743");
System.out.println( "Negated value is " + num.negate() ); } } ```
Output:
```java Negated value is -4743
```
程序 2:
```java // Java program to demonstrate negate() method import java.math.*;
public class GFG {
public static void main(String[] args) {
// Create a BigDecimal object BigDecimal num;
// Assign value to num num = new BigDecimal("-9674283517.97");
System.out.println( "Negated value is " + num.negate() ); } } ```
Output:
```java Negated value is 9674283517.97
```
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The java.math.BigDecimal.negate(MathContext mc) method returns a BigDecimal whose value is the negated value of it, i.e. obtained by rounding off according to the precision settings specified by the object of MathContext class.
语法:
java public BigDecimal negate(MathContext mc)参数:该方法只接受 MathContext 类对象的一个参数 mc ，该参数指定舍入大小数的精度设置。
返回值:该方法返回对象的求反值，该值根据精度设置进行舍入。
异常:如果得到的结果不准确，但舍入模式不必要，该方法可能会抛出算术异常。
下面的程序将举例说明 Java . math . bigdecimal . negation(MathContext MC)方法的使用: 程序 1
```java // Java program to demonstrate negate(MathContext mc) method import java.math.*;
public class GFG {
public static void main(String[] args) {
// create 2 BigDecimal objects BigDecimal num, negv;
MathContext mc = new MathContext(4); // 4 precision
// assign value to num num = new BigDecimal("78.6714");
// assign negate value of num to negv using mc negv = num.negate(mc); System.out.println("Negated value, rounded to 4"+ " precision " + negv); } } ```
Output:
```java Negated value, rounded to 4 precision -78.67
```
程序 2
```java // Java program to demonstrate negate(MathContext mc) method import java.math.*;
public class GFG {
public static void main(String[] args) {
// create 2 BigDecimal objects BigDecimal num, negv;
MathContext mc = new MathContext(12); // 12 precision
// assign value to num num = new BigDecimal("-178901456.68431");
// assign negate value of num to negv using mc negv = num.negate(mc); System.out.println("Negated value, rounded to 12 "+ "precision " + negv); } } ```
Output:
```java Negated value, rounded to 12 precision 178901456.684
```
参考: https://docs . Oracle . com/javase/7/docs/API/Java/math/bigdecimal . html # negative()
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