Code sharing of a random number generation module in Java programming

Generating Java random numbers is simple, it can be done through

Random rand = new Random(47); 
System.out.println(rand.nextInt()); 

can be generated, or generated as follows:

double d = Math.random(); 

Of course, the former in the code uses a fixed seed47Therefore, the value is the same each time, and it can also be used

Random rand = new Random(); 
System.out.println(rand.nextInt()); 

For the code2Then the random number generated is a double type.

Let's talk about3method, there is a requirement at present to generate4For random numbers, which are used for generating SMS registration codes, random numbers need to be used, so the code3To implement this. If the code between them is used, the result will not meet the conditions, so the following method is used to implement it:

//Method 1 
Random rand = new Random();
for (int i = 0; i < 4; i++{
	System.out.print(Math.abs(rand.nextInt() % 10))
}
//Random numbers are generated through rand.next, as there may be negative numbers, Math.abs is used to take the absolute value, and then modulo is taken.10，and the generated results are in}}10within 
//Method two 
Random rand = new Random();
for (int i = 0; i < 4; i++{
	System.out.print(rand2.nextInt(10))
}
//The above are directly generated using the api10within

This is a Java random number module I wrote recently, encapsulating various practical methods related to randomness, which I specially bring to share.

There is nothing high-tech here; the function names also indicate their usage, so a simple comment is enough. If you have any questions, please leave a message.

Source code (RandomSet.java):

import java.awt.Color;
import java.util.Collection;
import java.util.Iterator;
import java.util.Random;
public class RandomSet 
{
	static Random random = new Random();
	//obtains a random integer within a given range 
	public static int getRandomNum(int smallistNum, int BiggestNum) 
	 {
		return (Math.abs(random.nextInt()) % (BiggestNum-smallistNum+1))+smallistNum;
	}
	//obtains a random boolean value 
	public static Boolean getRandomBoolean() 
	 {
		return (getRandomNum(0,1) ==== 1);
	}
	//obtains a random number in the range of 0~1a floating-point number 
	public static float getRandomFloatIn_1()) 
	 {
		return (float) getRandomNum(0,1000)/1000;
	}
	//obtains a random color 
	public static Color getRandomColor() 
	 {
		float R = (float) getRandomNum(0,255)/255;
		float G = (float) getRandomNum(0,255)/255;
		float B = (float) getRandomNum(0,255)/255;
		return new Color(R, G, B);
	}
	//returns a boolean value with a certain probability 
	public static Boolean getRate(int rate) 
	 {
		if(rate<0 || rate > 100) 
		  {
			return false;
		} else 
		  {
			if(getRandomNum(0,100)<rate) 
			   {
				return true;
			} else 
			   {
				return false;
			}
		}
	}
	//Return a random element from the given array 
	public static <T> T getElement(T[] t) 
	 {
		int index = getRandomNum(0,t.length); - 1);
		return t[index];
	}
	//Return a random element from the given Collection 
	public static <T> T getElement(Collection<? extends T> c) 
	 {
		int atmp = getRandomNum(0,c.size()); - 1);
		Iterator<? extends T> iter = c.iterator();
		while(atmp > 0) 
		  {
			atmp--;
			iter.next();
		}
		return iter.next();
	}
}

Summary

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