Java基础----BigDecimal

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import java.math.BigDecimal;/* * 构造方法： * public BigDecimal(String val) *  * public BigDecimal add(BigDecimal augend) * public BigDecimal subtract(BigDecimal subtrahend) * public BigDecimal multiply(BigDecimal multiplicand) * public BigDecimal divide(BigDecimal divisor) * public BigDecimal divide(BigDecimal divisor,int scale,int roundingMode):商，几位小数，如何舍取 */public class BigDecimalDemo {public static void main(String[] args) {// System.out.println(0.09 + 0.01);// System.out.println(1.0 - 0.32);// System.out.println(1.015 * 100);// System.out.println(1.301 / 100);BigDecimal bd1 = new BigDecimal("0.09");BigDecimal bd2 = new BigDecimal("0.01");System.out.println("add:" + bd1.add(bd2));System.out.println("-------------------");BigDecimal bd3 = new BigDecimal("1.0");BigDecimal bd4 = new BigDecimal("0.32");System.out.println("subtract:" + bd3.subtract(bd4));System.out.println("-------------------");BigDecimal bd5 = new BigDecimal("1.015");BigDecimal bd6 = new BigDecimal("100");System.out.println("multiply:" + bd5.multiply(bd6));System.out.println("-------------------");BigDecimal bd7 = new BigDecimal("1.301");BigDecimal bd8 = new BigDecimal("100");System.out.println("divide:" + bd7.divide(bd8));System.out.println("divide:"+ bd7.divide(bd8, 3, BigDecimal.ROUND_HALF_UP));System.out.println("divide:"+ bd7.divide(bd8, 8, BigDecimal.ROUND_HALF_UP));}}
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