Java-小數點控制

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package 運算及類型轉換類;    import java.text.DecimalFormat;    public class 控制小數點類 {       public static double decimalFormatD(int num, double d){              String format = "0.";              String result = "";              double db;                            for(int i=0;i<num;i++)                  format = format.concat("0");                            DecimalFormat decimal = new DecimalFormat(format);              result = decimal.format(d);              db = Double.parseDouble(result);                            return db;          }                    public static float decimalFormatF(int num, float f){              String format = "0.";              String result = "";              float fl;                            for(int i=0;i<num;i++)                  format = format.concat("0");                            DecimalFormat decimal = new DecimalFormat(format);              result = decimal.format(f);              fl = Float.parseFloat(result);                            return fl;          }                      public static String doubleToString(double f){                     String s = "";              double a = 0;                            while(f >= 1) {                                    a = f%((double)10);                                    s = String.valueOf((int)a) + s;                  f=(f - a)/10;              }              return s;          }  }  

 

Java-小數點控制