小数点控制类

[java]代码库

import java.text.DecimalFormat;

public class 控制小数点类 {
	 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;
	    }
}