BigDecimal

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BigDecimal应用

    public static void main(String[] args) {        BigDecimal a = new BigDecimal(1);        BigDecimal b = new BigDecimal(1);        BigDecimal add = a.add(b);        BigDecimal subtract = a.subtract(b);        BigDecimal multiply = a.multiply(b);        BigDecimal divide = a.divide(b);        //加:2减:0乘:1除1        System.out.println("加:"+add+" 减:"+subtract+" 乘:"+multiply+" 除"+divide);    }

精度问题

    public static void main(String[] args) {        BigDecimal a = new BigDecimal(1.2222222222222);        //四舍五入取整        BigDecimal bigDecimal = a.setScale(0, BigDecimal.ROUND_HALF_UP);        System.out.println(bigDecimal);    }

java8写法

public class BiFunctionTest {    public static void main(String[] args) {        BiFunctionTest test = new BiFunctionTest();        System.out.println("加"+test.gettest(new BigDecimal(1), new BigDecimal(2), (a2, b2)->a2.add(b2)));        System.out.println("减"+test.gettest(new BigDecimal(1), new BigDecimal(2), (a2, b2)->a2.subtract(b2)));        System.out.println("乘"+test.gettest(new BigDecimal(1), new BigDecimal(2), (a2, b2)->a2.multiply(b2)));        System.out.println("除"+test.gettest(new BigDecimal(1), new BigDecimal(2), (a2, b2)->a2.divide(b2)));    }    public BigDecimal gettest(BigDecimal a,BigDecimal b,BiFunction<BigDecimal, BigDecimal, BigDecimal> biFunction){      return   biFunction.apply(a,b);    }}

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