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tips for java programming

 
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1.二进制浮点不能将0.1或者10的负幂次方精确表示,可以用BigDecimal来表示,避免使用float和double。
System.out.println(2.00-1.10);

result :0.8999999999999999
2.
final long first = 24*60*60*1000*1000;
      final long second = 24*60*60*1000;
      System.out.println(first/second);

result:5
乘在一起的因子都是int。故结果也是int。越界问题。
操作大数据,需提放。
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