Java Utililty Methods Random Int

List of utility methods to do Random Int

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Description

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

Method

intgenerateRandomInt(final int max)
generate Random Int 
return (int) (Math.random() * max);
intgenerateRandomInt(int min, int max)
generate Random Int 
Random random = new Random();
return random.nextInt(max) + min;
intgenerateRandomInteger(int aStart, int aEnd, Random aRandom)
Erzeugt eine Zufallszahl 
if (aStart > aEnd) {
    throw new IllegalArgumentException("Start cannot exceed End.");
long range = (long) aEnd - (long) aStart + 1;
long fraction = (long) (range * aRandom.nextDouble());
int randomNumber = (int) (fraction + aStart);
return randomNumber;
intgenerateRandomInteger(int start, int end)
Generates a random integer in the interval [start, end] (interval includes both start and end) and returns it. 
int range = end - start;
if (_randomNumberGenerator == null)
    _randomNumberGenerator = new Random();
if (range > 0)
    return _randomNumberGenerator.nextInt(range) + start;
return start;
Integer[]generateRandomIntegerArray(int size, int min, int max)
generate Random Integer Array 
Random random = new Random(System.currentTimeMillis());
Integer array[] = new Integer[size];
for (int i = 0; i < size; i++) {
    array[i] = random.nextInt(max - min + 1) + min;
return array;
SetgenerateRandomIntegers(int numbersNeeded, int bound)
generate Random Integers 
if (numbersNeeded > bound) {
    throw new RuntimeException("Can not generate number more than bound");
Random rng = new Random();
Set<Integer> generated = new LinkedHashSet<Integer>();
while (generated.size() < numbersNeeded) {
    Integer next = rng.nextInt(bound);
    generated.add(next);
...
intgenerateRandomIntInRange(int min, int max)
generate Random Int In Range 
return min + (int) (Math.random() * ((max - min) + 1));
Integer[]generateRandomIntObj(int range, int noOfElements)
generate Random Int Obj 
int arr[] = generateRandomInts(range, noOfElements);
Integer generatedInts[] = new Integer[arr.length];
for (int i = 0; i < arr.length; i++) {
    generatedInts[i] = arr[i];
return generatedInts;
int[]generateRandomInts(int range, int noOfElements)
generate Random Ints 
Random randomGenerator = new Random();
int generatedInts[] = new int[noOfElements];
for (int i = 0; i < generatedInts.length; i++) {
    generatedInts[i] = randomGenerator.nextInt(range);
return generatedInts;
intgenerateRandomIntUpto(int max)
generate Random Int Upto 
return nextInt(max);