Mire

MinimoComunMultiplo.java

package com.example;

import javax.swing.JOptionPane;

public class MinimoComunMultiplo {
	
	public static void main(String[] args) 
	{
		int a, b, t, t1, x;
		a = Integer.parseInt(JOptionPane.showInputDialog("A"));
		b = Integer.parseInt(JOptionPane.showInputDialog("B"));
		t = 1; // constante inicializada para evitar la multiplicidad x cero
		x = 2; // constante inicial

		while (x <= a && x <= b) 
		{
			while (a % x == 0 && b % x == 0) 
			{
				a = a / x;
				b = b / x;
				t = t * x;
			}
			x++;
		}
		t1 = t;
		t = t * a * b;
		System.out.println("El mcm es :" + t);
		System.out.println("El mcd es :" + t1);
	}

}