import java.text.*;class fnum
{
DecimalFormat df = new DecimalFormat("#.00");
public static void main(String k[]){
fnum f = new fnum();
}
public fnum(){
StringBuffer d = new StringBuffer("");
df.format(1123.33333,d,new FieldPosition(2));
System.out.println(d);
}
}
{
DecimalFormat df = new DecimalFormat("#.00");
public static void main(String k[]){
fnum f = new fnum();
}
public fnum(){
StringBuffer d = new StringBuffer("");
df.format(1123.33333,d,new FieldPosition(2));
System.out.println(d);
}
}
这样也行:
float f = 34.232323;
BigDecimal b = new BigDecimal(f);
float f1 = b.setScale(2, BigDecimal.ROUND_HALF_UP).floatValue();// b.setScale(2, BigDecimal.ROUND_HALF_UP) 表明四舍五入,保留两位小数
上面是对float类型的处理,如果对double的,则将上面所有的float字段换成double就行
float scale;
DecimalFormat fnum = new DecimalFormat("##0.00");
String dd=fnum.format(scale);
System.out.println(dd);