Format file size as MB, GB, etc [duplicate] Format file size as MB, GB, etc [duplicate] java java

Format file size as MB, GB, etc [duplicate]


java string format numbers 

public static String readableFileSize(long size) {    if(size <= 0) return "0";    final String[] units = new String[] { "B", "kB", "MB", "GB", "TB" };    int digitGroups = (int) (Math.log10(size)/Math.log10(1024));    return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups)) + " " + units[digitGroups];}

This will work up to 1000 TB.... and the program is short!

java string format numbers

You'll probably have more luck with java.text.DecimalFormat. This code should probably do it (just winging it though...)

new DecimalFormat("#,##0.#").format(value) + " " + unit

java string format numbers

It is surprising for me, but a loop-based algorithm is about 10% faster.

public static String toNumInUnits(long bytes) {    int u = 0;    for ( ; bytes > 1024*1024; bytes >>= 10) {        u++;    }    if (bytes > 1024)        u++;    return String.format("%.1f %cB", bytes/1024f, " kMGTPE".charAt(u));}

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