Arthas-MathGame

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;
/**
 * MathGame.<br>
 * @author gongqiang <br>
 * @version 1.0.0 2021年6月4日<br>
 * @see 
 * @since JDK 1.5.0
 */
public class MathGame {
    private static Random random = new Random();
    private int illegalArgumentCount = 0;

    public List<Integer> primeFactors(int number) {
		if (number < 2) {
			++this.illegalArgumentCount;
            throw new IllegalArgumentException("number is: " + number + ", need >= 2");
        }
        ArrayList<Integer> result = new ArrayList<Integer>();
		int i = 2;
		while (i <= number) {
			if (number % i == 0) {
				result.add(i);
				number /= i;
				i = 2;
                continue;
            }
			++i;
        }
		return result;
    }

    public static void main(String[] args) throws InterruptedException {
        MathGame game = new MathGame();
        while (true) {
			game.run();
			TimeUnit.SECONDS.sleep(1L);
        }
    }

    public void run() throws InterruptedException {
        try {
			int number = random.nextInt() / 10000;
			List<Integer> primeFactors = this.primeFactors(number);
			MathGame.print(number, primeFactors);
        }
        catch (Exception e) {
			System.out.println(String.format("illegalArgumentCount:%3d,", this.illegalArgumentCount) + e.getMessage());
        }
    }

    public static void print(int number, List<Integer> primeFactors) {
        StringBuffer sb = new StringBuffer(number + "=");
		for (int factor : primeFactors) {
			sb.append(factor).append('*');
        }
		if (sb.charAt(sb.length() - 1) == '*') {
			sb.deleteCharAt(sb.length() - 1);
        }
		System.out.println(sb);
    }
}