Java Utililty Methods Random Int

List of utility methods to do Random Int

  1. HOME
  2. Java
  3. R
  4. Random Int

Description

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

Method

intrandomIntInRange(int lowerBound, int upperBound)
random Int In Range 
if (upperBound < lowerBound)
    throw new IllegalArgumentException("lowerBound must be smaller than upperBound");
if (upperBound == lowerBound)
    return upperBound;
double rand = Math.random();
rand = rand * (upperBound - lowerBound);
rand += lowerBound;
float r = (float) rand;
...
intrandomIntRange(int low, int high)
Get a random integer in the given half-open range. 
return low + ((int) Math.floor(Math.random() * (high - low)));
intrandomIntWithDigits(int digits)
random Int With Digits 
int max = (int) Math.pow(10, digits) + 1;
return randomIntWithMinMax(0, max);
StringrandomKey(int sLen)
random Key 
String base;
String temp;
int i;
int p;
base = "1234567890abcdefghijklmnopqrstuvwxyz";
temp = "";
for (i = 0; i < sLen; i++) {
    p = (int) (Math.random() * 37);
...
int[][]randomMatrix(int x, int y)
random Matrix 
int[][] matrix = new int[x][y];
for (int i = 0; i < matrix.length; i++) {
    for (int j = 0; j < matrix[0].length; j++) {
        matrix[i][j] = (int) (Math.random() * 10);
return matrix;
StringrandomModuleName(int count)
Generate random module name. 
String upperCaseAlpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String lowerCaseAlpha = "abcdefghijklmnopqrstuvwxyz";
String alpha = upperCaseAlpha + lowerCaseAlpha;
StringBuilder builder = new StringBuilder();
while (count-- != 0) {
    int character = (int) (Math.random() * alpha.length());
    builder.append(alpha.charAt(character));
return builder.toString();
intrandomNum(int n)
random Num 
return (int) (Math.random() * Math.pow(10, n));
StringrandomNum(int number)
random Num 
StringBuffer result = new StringBuffer();
for (int i = 0; i < number; i++) {
    int random = (int) (Math.random() * 10);
    result.append(random);
return result.toString();
intrandomNumber(int lower, int upper)
random Number 
return lower + (int) (Math.random() * ((upper - lower) + 1));
intrandomNumber(int lower_bound, int higher_bound)
Random number. 
int random_number = lower_bound + (int) (Math.random() * ((higher_bound - lower_bound) + 1));
return random_number;