Java Utililty Methods Random Long

List of utility methods to do Random Long

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Description

The list of methods to do Random Long are organized into topic(s).

Method

longrandomLong(long x, long y)
random Long 
return x + ((long) (Math.random() * (y - x)));
longrandomLongWithMinMax(long min, long max)
random Long With Min Max 
return (long) (min + (Math.random() * (max - min + 1)));
voidrandomSleep(long ms)
Sleep for a short random amount of time 
try {
    Thread.sleep((long) (ms * Math.random()));
} catch (InterruptedException e) {
StringrandomStr(long strLen)
random Str 
char freshChar;
String freshString;
freshString = "";
while (freshString.length() < (strLen - 1)) {
    freshChar = (char) (Math.random() * 128);
    if (Character.isLetter(freshChar)) {
        freshString += freshChar;
return (freshString);
StringrandomStr(long strLen)
This is slow! 
char freshChar;
StringBuilder sb = new StringBuilder();
while (sb.length() < (strLen - 1)) {
    freshChar = (char) (Math.random() * 128);
    if (Character.isLetter(freshChar)) {
        sb.append(freshChar);
return sb.toString();
longrandPosLong()
simply uses Math.random, only 0 and positive longs returned 
return randPosLong(Long.MAX_VALUE);
longsecureRandomLong()
secure Random Long 
return UUID.randomUUID().getLeastSignificantBits();