High-precision integers and high-precision decimals in Java

In the actual coding, you will encounter many high-precision cases, for example, in the calculation of money need to retain high-precision decimals, so that the calculation will not be too much error:

In the following code, we verify that when the number of two float types is added, the resulting result is error with our expected result, and in order to reduce and prevent this error, we need to use the BigInteger class and the BigDecimal class to calculate.

 PackageCom.ietree.base.number;ImportJava.math.BigDecimal;ImportJava.math.BigInteger; Public classBigintegertest { Public Static voidMain (string[] args) {floatF1 = 123.01f + 2.01f; //expected output: 125.02, actual output: 125.020004System.out.println (F1); //expected output: 125.02, actual output: 125.02000000000001System.out.println (123.01 + 2.01); System.out.println ("==============================="); //High-precision integer testingBigInteger bint1 =NewBigInteger ("125"); BigInteger Bint2=NewBigInteger ("999");        BigInteger tmp; //AddTMP =Bint1.add (Bint2); System.out.println ("Bint1 + Bint2 =" +tmp); //SubtractTMP =bint2.subtract (BINT1); System.out.println ("Bint2-bint1 =" +tmp); //MultiplyTMP =bint1.multiply (Bint2); System.out.println ("Bint1 * Bint2 =" +tmp); //DivideTMP =bint2.divide (BINT1); System.out.println ("Bint2/bint1 =" +tmp); //Find remainderTMP =Bint2.remainder (BINT1); System.out.println ("Bint2% Bint1 =" +tmp); //seeking the second partyTMP = BINT2.POW (2); System.out.println ("Bint2 two times =" +tmp); System.out.println ("======================================"); //High Precision Fractional testBigDecimal BD1 =NewBigDecimal (123.01); BigDecimal Bd2=NewBigDecimal (2.01);        BIGDECIMAL BD; //AddBD =Bd1.add (BD2); System.out.println ("BD1 + Bd2 =" +BD); //SubtractBD =bd1.subtract (BD2); System.out.println ("BD2-BD1 =" +BD); //MultiplyBD =bd1.multiply (BD2); System.out.println ("Bd1 * Bd2 =" +BD); //Divide//bd = Bd1.divide (BD2);BD = Bd1.divide (NewBigDecimal (2.0)); System.out.println ("bd1/2.0 =" +BD); //Find remainderBD =Bd1.remainder (BD2); System.out.println ("Bd2% BD1 =" +BD); //seeking the second partyBD = Bd1.pow (3); System.out.println ("Bd2 three times =" +BD); System.out.println ("======================================"); //rounding reserved decimal digitsBigDecimal Bd3 =NewBigDecimal (123.01). Setscale (5,5); System.out.println ("Bd3 =" +Bd3); }}

High-precision integers and high-precision decimals in Java