H5oef1

package domein;

public class Berekening
{
	private int x, y;

	// setters, in UML met - dus private
	private void setX(int x)
	{
		this.x = x;
	}

	private void setY(int y)
	{
		this.y = y;
	}

	// constructor
	public Berekening(int g1, int g2)
	{
		int gr, kl;
		gr = Math.max(g1, g2);
		kl = Math.min(g1, g2);
		this.setX(gr);
		this.setY(kl);
	}

	// getters
	public int getX()
	{
		return this.x;
	}

	public int getY()
	{
		return this.y;
	}

	// andere methoden
	public String geefSom()
	{
		String s;
		s = String.format("De som van %d en %d is %d", this.x, this.y, this.x+this.y);
		return s;
	}

	public String geefVerschil()
	{
		String s;
		s = String.format("Het verschil tussen %d en %d is %d", this.x, this.y, this.x-this.y);
		return s;
	}

	public String geefProduct()
	{
		String s;
		s = String.format("Het product van %d en %d is %d", this.x, this.y, this.x*this.y);
		return s;
	}

	public String geefQuotient()
	{
		String s;
		if(this.y == 0)
			s = "Fout: deling door nul";
		else
			s = String.format("Het quotiënt van %d en %d is %d", this.x, this.y, this.x/this.y);
		return s;
	}

}

-------------

package ui;

import java.util.Scanner;

import domein.Berekening;

public class BerekeningApplicatie
{

	public static void main(String[] args)
	{
		int g1, g2, code;
		String s = "";
		Scanner input = new Scanner(System.in);

		do 			// input controleren: do while
		{
			System.out.println("code = 1: x + y");
			System.out.println("code = 2: grootste getal -  kleinste getal ");
			System.out.println("code = 3: x * y ");
			System.out.println("code = 4: grootste getal / kleinste getal (gehele deling!)");
			System.out.println("-1 om te stoppen");
			System.out.print("Geef een code in: ");
			code = input.nextInt();
		} while(!(code == 1 || code == 2 || code == 3 || code == 4 || code == -1));

		while(code != -1)		// schildwacht: while
		{
			System.out.print("Geef een geheel getal: ");
			g1 = input.nextInt();
			System.out.print("Geef nog een geheel getal: ");
			g2 = input.nextInt();

			Berekening berekening = new Berekening(g1, g2);

			switch(code)
			{
			case 1: s = berekening.geefSom();break;
			case 2: s = berekening.geefVerschil();break;
			case 3: s = berekening.geefProduct();break;
			case 4: s = berekening.geefQuotient();break;
			}

			System.out.printf("%s%n%n", s);

			do
			{
				System.out.println("code = 1: x + y");
				System.out.println("code = 2: grootste getal -  kleinste getal ");
				System.out.println("code = 3: x * y ");
				System.out.println("code = 4: grootste getal / kleinste getal (gehele deling!)");
				System.out.println("-1 om te stoppen");
				System.out.print("Geef een code in: ");
				code = input.nextInt();
			} while(!(code == 1 || code == 2 || code == 3 || code == 4 || code == -1));
		}
		System.out.println("Tot ziens!");
	}

}