Java tutorial
//package com.java2s; import java.util.Locale; public class Main { public static String formatPercent(long completed, long total) { if (completed <= 0 || total <= 0) { return "0.0%"; } final float c = completed; final float t = total; try { return String.format(Locale.US, "%.1f%%", c / t * 100); } catch (Exception e) { e.printStackTrace(); } return "0.0%"; } }