Java's BigDecimal class

1  Public classDemo5_bigdecimal {2 3     /*4 * A:bigdecimal Overview5 * float and double are easy to lose precision, so in order to accurately represent and calculate floating-point numbers, Java provides bigdecimal6 * Immutable, arbitrary-precision signed decimal number. 7 * B: Construction method8 * Public BigDecimal (String val)9 * C: Member MethodTen * Public BigDecimal Add (BigDecimal augend) One * Public BigDecimal Subtract (BigDecimal subtrahend) A * Public BigDecimal Multiply (BigDecimal multiplicand) - * Public BigDecimal Divide (BigDecimal divisor) -      */ the      Public Static voidMain (string[] args) { -System.out.println (2.0-1.1);//0.8999999999999999 can be infinitely close to 0.9 -          -BigDecimal B11 =NewBigDecimal (2.0); +BigDecimal B22 =NewBigDecimal (1.1); -System.out.println (B11.subtract (B22));//The result is a slightly more precise 0.899999999999999911182158029987476766109466552734375 +          ABigDecimal B1 =NewBigDecimal ("2.0"); atBigDecimal B2 =NewBigDecimal ("1.1"); -System.out.println (B1.subtract (B2));//by constructing parameters passed into the string, the result is an exact 0.9 -          -BigDecimal BD1 = bigdecimal.valueof (2.0); -BigDecimal Bd2 = bigdecimal.valueof (1.1); -System.out.println (Bd1.subtract (BD2));//this way you can also get the result for the exact 0.9 in  -     } to  +}

Java's BigDecimal class