Possible Duplicate:
Format file size as MB, GB etc
Using NumberFormat, I would like to have my numbers formatted as scientific multipliers. In other words, I would like to have the following formatting:
And obviously other numbers should be expressed using k, G, and other multiples.
How can I do that ? Or do I need some Java library ?
Roughly, this should work. It needs some polishing regarding proper double formatting.
static String formatSize(double size) {
String finalQ = "";
for (String q: new String[] {"k", "M", "G"}) {
if (size < 1024) break;
finalQ = q;
size /= 1024;
}
return size + finalQ;
}
package com.shashi.mpoole;
public class MetricPrefix {
static int ONE_ZERO_TWO_FOUR = 1024;
static String SEPARATOR = " ";
enum SIZE
{
B, K, M, G, T, P, E, Z, Y;
// BYTE, KILO, MEGA, GIGA, TERA, PETA, EXA, ZETTA, YOTTA;
}
class Result
{
int number = 0;
SIZE size;
public Result setNumber(int number)
{
this.number = number;
return this;
}
public Result setSize(SIZE size)
{
this.size = size;
return this;
}
public String getValue()
{
return this.number + SEPARATOR + this.size;
}
}
public Result getResult(double howMuchBigger)
{
double bigNumber = howMuchBigger;
int index = 0;
while(howMuchBigger-ONE_ZERO_TWO_FOUR>0)
{
bigNumber = howMuchBigger;
howMuchBigger = howMuchBigger/ONE_ZERO_TWO_FOUR;
index++;
}
if(index == 0)
return new Result().setNumber((int) (bigNumber)).setSize(SIZE.values()[index]);
else
return new Result().setNumber((int) (bigNumber/ONE_ZERO_TWO_FOUR)).setSize(SIZE.values()[index]);
}
public static void main(String[] args) {
MetricPrefix j = new MetricPrefix();
System.out.println(j.getResult(56).getValue());
}
}
