Writing a simple 4-digit verification code

2016.11.29

 

When we forget the password or verify the password, we always use the verification code. Then let's take a look at how the verification code is written?

Requirement: Write a function to randomly generate a 4-digit verification code

import java.util.Random;

public class Demo5 {

	public static void main(String[] args) {

		char[] arr = {'中','country','people','people','wan','years'};
		StringBuilder sb = new StringBuilder();
		Random random = new Random();
		//Need four random numbers, get the characters in the random number through the random number
		
		for(int i=0;i<4;i++){
			int index = random.nextInt(arr.length);//Generating random numbers must be an array range or something
			sb.append(arr[index]);
		}
		System.out.println("Verification code: "+sb);
	}
}

   Doesn't it feel very simple, just a few lines of code can be implemented, you can try it too.