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Now we have the test, let's implement the code

public class Money { 
  // ... all the previous code 
  public boolean equals(Object anObject) {
    if (anObject instanceof Money) {
        Money aMoney= (Money)anObject;
        return aMoney.currency().equals(currency())
            & & amount() == aMoney.amount();
    }
    return false;
}

• Money is a value object, must first check it is of the correct type, and then check the inside values.
• go back and check we have handled all cases in the test.

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