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  • BigDecimal常用的加减乘除算法、比较大小、不展示多余的零、保存两位小数点

    项目中涉及到了BigDecimal的加、减、乘、比较大小、精确度的问题。所以在此总结一下,方便以后复习。

     1 //加法
     2 
     3 BigDecimal coins = new BigDecimal("0");
     4 
     5 BigDecimal one = new BigDecimal("1");
     6 
     7 BigDecimal two = new BigDecimal("2");
     8 
     9 coins =  coins.add( two  );  //coins 加 2
    10 System.out.println(  coins.doubleValue());  //输出为2.0
    11 
    12 coins =  coins.subtract( one  );  //coins 减 1
    13 System.out.println(  coins.doubleValue());  //输出为1.0
    14 
    15 coins =  coins.subtract( two  );  //coins 乘以 2
    16 System.out.println(  coins.doubleValue());  //输出为2.0
    17 
    18 int  i = coins .compareTo(BigDecimal.ZERO) ;  //判断coins是否大于0  
    19 int  k = coins .compareTo( one ) ;//如果 i =0 说明相等;i < 0 说明 coins小于 one; i > 0 说明coins > one
    20 coins = coins.setScale(2,BigDecimal.ROUND_HALF_UP) //保存两位小数点

     

     1,java代码去除BigDecimal多余的零

    private BigDecimal vipPrice;
    String price = vipPrice.stripTrailingZeros().toPlainString()

    2,Mybaties 查询myslq中decimal时,去除多余的零

    select 0 + CAST(good.vipPrice AS CHAR) AS vipPrice
    from table;



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  • 原文地址:https://www.cnblogs.com/hero123/p/8962540.html
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