Java Language Generating Random number using apache-common lang3


Example

We can use org.apache.commons.lang3.RandomUtils to generate random numbers using a single line.

int x = RandomUtils.nextInt(1, 1000);

The method nextInt(int startInclusive, int endExclusive) takes a range.

Apart from int, we can generate random long, double, float and bytes using this class.

RandomUtils class contains the following methods-

static byte[] nextBytes(int count) //Creates an array of random bytes.
static double nextDouble() //Returns a random double within 0 - Double.MAX_VALUE
static double nextDouble(double startInclusive, double endInclusive) //Returns a random double within the specified range.
static float nextFloat() //Returns a random float within 0 - Float.MAX_VALUE
static float nextFloat(float startInclusive, float endInclusive) //Returns a random float within the specified range.
static int nextInt() //Returns a random int within 0 - Integer.MAX_VALUE
static int nextInt(int startInclusive, int endExclusive) //Returns a random integer within the specified range.
static long nextLong() //Returns a random long within 0 - Long.MAX_VALUE
static long nextLong(long startInclusive, long endExclusive) //Returns a random long within the specified range.