JAVA笔记:double四舍五入并保留两位小数的方法

1.只要输出结果

double  x1 =  0.026 ;
System.out.println(String.format( "%.2f" , x1));

2.数据转换

//方案一:
get_double = ( double )(Math.round(result_value* 100 )/ 100.0 )
//方案二:
DecimalFormat df =  new  DecimalFormat( "#.##" );
get_double = Double.ParseDouble(df.format(result_value));
//方案三:
get_double = Double.ParseDouble(String.format( "%.2f" ,result_value));
//方案四:
BigDecimal bd =  new  BigDecimalresult_value();
BigDecimal  bd2 = bd.setScale( 2 ,BigDecimal  .ROUND_HALF_UP);
get_double = Double.ParseDouble(bd2.ToString());

3.只保留两位小数(不含四舍五入)

double  d =  13.4324 ;
d=(( int )(d* 100 ))/ 100 ;