java

Java core

java基础学习随笔

Posted by Jimmer on July 24, 2019

Java core笔记

一.数据结构

### 1.BigDecimal

大数值类型.

BigDecimal BigDecimal(String s); BigDecimal valueOf(double d);

不可用double 参数的构造方法,会造成结果不准确:

  double d1 = 0.10334;
  System.out.println("new BigDecimal("+d1+")=" + new BigDecimal(d1));
  输出为:
  ---
  new BigDecimal(0.10334)=0.10334000000000000130118138486068346537649631500244140625