Java Utililty Methods Formatter Usage

List of utility methods to do Formatter Usage

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Description

The list of methods to do Formatter Usage are organized into topic(s).

Method

StringnumberWithLeadingZeroes(int n, int totalChars)
number With Leading Zeroes 
Formatter formatter = new Formatter(Locale.US);
String suffix = "" + formatter.format("%0" + totalChars + "d", n);
formatter.close();
return suffix;
voidshowVxlanHeaderOutput()
show Vxlan Header Output 
StringBuilder sb = new StringBuilder();
Formatter fmt = new Formatter(sb);
System.out.println(fmt.format(VXLAN_OUTPUT_FORMAT_LINE1, "Name", "Description"));
sb.setLength(0);
System.out.println(fmt.format(VXLAN_OUTPUT_FORMAT, "Local IP", "Remote IP", "Gateway IP", "AdmState"));
sb.setLength(0);
System.out.println(fmt.format(VXLAN_OUTPUT_FORMAT, "OpState", "Parent", "Tag", ""));
sb.setLength(0);
...
voidsubstitution(Formatter formatter, int flags, int width, int precision, StringBuilder obj)
substitution 
StringBuilder sb = new StringBuilder(obj.length());
if (precision == -1 || obj.length() < precision) {
    sb.append(obj.toString());
} else {
    sb.append(obj.substring(0, precision - 3)).append("...");
final int L = sb.length();
if (L < width) {
...
StringtoHexString(final byte[] data)
Converts the given byte array to hex string 
try (Formatter formatter = new Formatter()) {
    for (final byte b : data) {
        formatter.format("%02x", b);
    return formatter.toString();
StringtoReadableSize(long bytes)
to Readable Size 
if (bytes < KB && bytes >= 0) {
    return Long.toString(bytes) + " bytes";
StringBuilder builder = new StringBuilder();
Formatter format = new Formatter(builder, Locale.getDefault());
if (bytes < MB) {
    format.format("%.2f KB", (float) bytes / (float) KB);
} else if (bytes < GB) {
...
StringtoTwoDigit(double f)
gets two digit string 
if (Double.isNaN(f))
    return "";
Formatter fmt = new Formatter();
if (Math.abs(Math.floor(f) - f) < .00001) {
    Double floor = new Double(Math.floor(f));
    long asInt = floor.longValue();
    return fmt.format("%d", asInt).toString();
return fmt.format("%.2f", f).toString();
StringtoUUIDFormat(byte[] bytes)
to UUID Format 
byte[] switched = new byte[] { bytes[3], bytes[2], bytes[1], bytes[0], bytes[5], bytes[4], bytes[7],
        bytes[6], bytes[8], bytes[9], bytes[10], bytes[11], bytes[12], bytes[13], bytes[14], bytes[15] };
StringBuilder sb = new StringBuilder(bytes.length * 2);
Formatter formatter = new Formatter(sb);
for (byte b : switched) {
    formatter.format("%02x", b);
sb.insert(8, "-");
...
voidvalidateCondition(boolean condition, String messageFormat, Object... messageArgs)
Validates that a condition is true . 
if (!condition) {
    throw new IllegalArgumentException(String.format(messageFormat, messageArgs));
voidwarnfErr(String format, String... params)
warnf Err 
System.err.println(new Formatter().format("WARN: " + format, params));