Java BigDecimal negate()方法与示例
BigDecimal類的negate()方法 (BigDecimal Class negate() method)
Syntax:
句法:
public BigDecimal negate();public BigDecimal negate(MathContext ma_co);negate() method is available in java.math package.
negate()方法在java.math包中可用。
negate() method is used to get a negation of this BigDecimal and its scale is non-negative.
negate()方法用于獲取此BigDecimal的取反,并且其標度為非負數。
negate(MathContext ma_co) method is used to retrieve a negation of this BigDecimal along with rounding based on the given MathContext settings.
negate(MathContext ma_co)方法用于檢索此BigDecimal的取反以及基于給定MathContext設置的舍入。
These methods may throw an exception at the time of the negation of an object.
這些方法在對象取反時可能會引發異常。
ArithmeticException: This exception may throw when the result is not accurate and set the rounding mode "UNNECESSARY".
ArithmeticException :當結果不正確并且將舍入模式設置為“ UNNECESSARY”時,可能會引發此異常。
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.
這些是非靜態方法,可通過類對象訪問,如果嘗試使用類名訪問這些方法,則會收到錯誤消息。
Parameter(s):
參數:
In the first case, negate(),
在第一種情況下, negate() ,
- It does not accept any parameter.
In the first case, negate(MathContext ma_co),
在第一種情況下, negate(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設置。
Return value:
返回值:
In both the cases, the return type of the method is BigDecimal,
在這兩種情況下,方法的返回類型均為BigDecimal 。
In the first case, it returns the negation of this BigDecimal.
在第一種情況下,它返回此BigDecimal的取反。
In the second case, it returns the negation of this BigDecimal. with rounding if required.
在第二種情況下,它返回此BigDecimal的取反。 如果需要,請四舍五入。
Example:
例:
// Java program to demonstrate the example // of negate() method of BigDecimalimport java.math.*;public class NegateOfBD {public static void main(String args[]) {// Initialize two variables val1,// val2 String val1 = "-10.30";int val2 = 4;// Initialize two BigDecimal objects and// one MathContextBigDecimal b_dec1 = new BigDecimal(val1);BigDecimal b_dec2 = new BigDecimal(val2);MathContext ma_co = new MathContext(2, RoundingMode.CEILING);System.out.println("negate(): ");// returns the negate value of this BigDecimal// like (-b_dec2)BigDecimal negate = b_dec2.negate();System.out.println("b_dec2.negate(): " + negate);System.out.println(" ");System.out.println("negate(MathContext): ");// returns the negate value of this BigDecimal// (-b_dec1) and return the result based on the given// context settingsnegate = b_dec1.negate(ma_co);System.out.println("b_dec1.negate(ma_co): " + negate);} }Output
輸出量
negate(): b_dec2.negate(): -4negate(MathContext): b_dec1.negate(ma_co): 11翻譯自: https://www.includehelp.com/java/bigdecimal-negate-method-with-example.aspx
總結
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