Java - random integer number in range with exclusive max value example

In this short article we want to show how in Java randomize integer number in range with exclusive max value.

1. Custom random method examples

package com.dirask.examples;

public class RandomUtil {
	
	public static int randomize() throws Exception {
		return randomize(Integer.MAX_VALUE);
	}
	
	public static int randomize(int max) throws Exception {
		return randomize(0, max);
	}
	
	public static int randomize(int min, int max) throws Exception {
	  	if(min > max - 1) {
	    	throw new Exception("Incorrect arguments.");
	    }
	    return (int) (min + (max - min) * Math.random());
	}
}

Usage example:

package com.dirask.examples;

public class Program {

    public static void main(String[] args) throws Exception {

        System.out.println( RandomUtil.randomize() );         //  5547382624322139
        System.out.println( RandomUtil.randomize( 5 ) );      //  3
        System.out.println( RandomUtil.randomize( 10, 80 ) ); //  62
        System.out.println( RandomUtil.randomize(-50, 50 ) ); // -8
    }   
}