Java BigDecimal abs（）方法与示例

快来打我* 2023-03-05 12:58 34阅读 0赞

## BigDecimal类abs()方法 **(**BigDecimal Class abs() method**)** ##

**Syntax:**

**句法：**

public BigDecimal abs();
        public BigDecimal abs(MathContext ma_co);

*  **abs() method** is available in java.math package.
    
    **abs()方法**在java.math包中可用。
 *  **abs() method** is used to get a BigDecimal that holds the absolute value of this BigDecimal.
    
    **abs()方法**用于获取保存该BigDecimal绝对值的BigDecimal。
 *  **abs(MathContext ma\_co) method** is used to get a BigDecimal and its value is the absolute value of this BigDecimal based on the given MathContext settings.
    
    **abs(MathContext ma\_co)方法**用于获取BigDecimal，其值为基于给定MathContext设置的该BigDecimal的绝对值。
 *  These methods may throw an exception at the time of returning an absolute value.
    
    这些方法在返回绝对值时可能会引发异常。
    
    **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, **abs()**,
    
    在第一种情况下， **abs()** ，
    
     *  It does not accept any parameter.
 *  In the first case, **abs(MathContext ma\_co)**,
    
    在第一种情况下， **abs(MathContext ma\_co)** ，
    
     *  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, it returns the absolute value of the BigDecimal and rounding based on the default or context setting.

在这两种情况下，方法的返回类型均为BigDecimal ，它返回BigDecimal的绝对值并根据默认值或上下文设置舍入。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of abs() method of BigDecimal
    
    import java.math.*;
    public class AbsOfBD {
        
        public static void main(String args[]) {
        
            // Initialize two variables val,
            // and str 
            String val = "-100.52";
            String str = "-2.346";
    
            // Initialize two BigDecimal objects and
            // one MathContext
            BigDecimal b_dec1 = new BigDecimal(val);
            BigDecimal b_dec2 = new BigDecimal(str);
            MathContext ma_co = new MathContext(3, RoundingMode.CEILING);
    
            // returns the BigDecimal that holds 
            // the absolulte value of this BigDecimal
            // b_dec1
            BigDecimal abs_val = b_dec1.abs();
            System.out.println("b_dec1.abs(): " + abs_val);
    
            // returns the BigDecimal that holds 
            // the absolulte value of this BigDecimal
            // b_dec2 based on the given context
            // settings
            abs_val = b_dec2.abs(ma_co);
            System.out.println("b_dec2.abs(ma_co): " + abs_val);
        }
    }

**Output**

**输出量**

b_dec1.abs(): 100.52
    b_dec2.abs(ma_co): 2.35

> 翻译自: [https://www.includehelp.com/java/bigdecimal-abs-method-with-example.aspx][https_www.includehelp.com_java_bigdecimal-abs-method-with-example.aspx]

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