System.out.println(0.05+0.01);

System.out.println(1.0-0.42);

System.out.println(4.015*100);

System.out.println(123.3/100);

在运行这段代码时就会发现一些列的问题,java并不像其他语言那样对货币的运算有特殊的处理,一切只能靠自己造轮子了

public static BigDecimal add(double v1,double v2) {

BigDecimal b1 = new BigDecimal(Double.toString(v1));

BigDecimal b2 = new BigDecimal(Double.toString(v2));

return b1.add(b2);

}

public static BigDecimal sub(double v1,double v2) {

BigDecimal b1 = new BigDecimal(Double.toString(v2));

BigDecimal b2 = new BigDecimal(Double.toString(v2));

return b1.subtract(b2);

}

public static BigDecimal mul(double v1,double v2) {

BigDecimal b1 = new BigDecimal(Double.toString(v1));

BigDecimal b2 = new BigDecimal(Double.toString(v2));

return b1.multiply(b2);

}

public static BigDecimal div(double v1,double v2) {

BigDecimal b1 = new BigDecimal(Double.toString(v1));

BigDecimal b2 = new BigDecimal(Double.toString(v2));

return b1.divide(b2);

}