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  • algorithm diagram

    - by tunl
    This is the max searching algorithm diagram: So, I wonder how can draw diagram for Recursion in HaNoi Tower program: package tunl; public class TowersApp { static int n = 3; public static void main(String[] args) { TowersApp.doTowers(3, 'A', 'B', 'C'); } public static void doTowers(int n, char from, char inter, char to) { if (n == 1) { System.out.println("disk 1 from "+ from + " to " + to); } else { doTowers(n-1, from, to, inter); System.out.println("disk " + n + " from " + from + " to " + to); doTowers(n-1, inter, from, to); } } } I can't draw it. Anyone can help me !!!

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  • Mock Object and Interface

    - by tunl
    I'm a newbie in Unit Test with Mock Object. I use EasyMock. I try to understand this example: import java.io.IOException; public interface ExchangeRate { double getRate(String inputCurrency, String outputCurrency) throws IOException; } import java.io.IOException; public class Currency { private String units; private long amount; private int cents; public Currency(double amount, String code) { this.units = code; setAmount(amount); } private void setAmount(double amount) { this.amount = new Double(amount).longValue(); this.cents = (int) ((amount * 100.0) % 100); } public Currency toEuros(ExchangeRate converter) { if ("EUR".equals(units)) return this; else { double input = amount + cents/100.0; double rate; try { rate = converter.getRate(units, "EUR"); double output = input * rate; return new Currency(output, "EUR"); } catch (IOException ex) { return null; } } } public boolean equals(Object o) { if (o instanceof Currency) { Currency other = (Currency) o; return this.units.equals(other.units) && this.amount == other.amount && this.cents == other.cents; } return false; } public String toString() { return amount + "." + Math.abs(cents) + " " + units; } } import junit.framework.TestCase; import org.easymock.EasyMock; import java.io.IOException; public class CurrencyTest extends TestCase { public void testToEuros() throws IOException { Currency testObject = new Currency(2.50, "USD"); Currency expected = new Currency(3.75, "EUR"); ExchangeRate mock = EasyMock.createMock(ExchangeRate.class); EasyMock.expect(mock.getRate("USD", "EUR")).andReturn(1.5); EasyMock.replay(mock); Currency actual = testObject.toEuros(mock); assertEquals(expected, actual); } } So, i wonder how to Currency use ExchangeRate in toEuros(..) method. rate = converter.getRate(units, "EUR"); The behavior of getRate(..) method is not specified because ExchangeRate is an interface.

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