diff -r 251d0ed461fb -r 58ec6da75f6f task4/solution11/src/org/apidesign/apifest08/currency/CurrencyValue.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/task4/solution11/src/org/apidesign/apifest08/currency/CurrencyValue.java	Sat Oct 11 23:38:46 2008 +0200
@@ -0,0 +1,72 @@
+package org.apidesign.apifest08.currency;
+
+import java.io.Serializable;
+
+/**
+ * Value class, holding an amount of the currency & an identifier of the currency.
+ * Designed to be an immutable.
+ * 
+ * Because of a vague definition of types of the both fields,
+ * the class has generic types, used as types of the fields.
+ * These types should be immutable classes, too.
+ * 
+ * @author ked
+ */
+public final class CurrencyValue<AmountType, IdentifierType> implements Serializable {
+
+    private final AmountType amount;
+    private final IdentifierType identifier;
+
+    private CurrencyValue(AmountType amount, IdentifierType identifier) {
+        this.amount = amount;
+        this.identifier = identifier;
+    }
+
+    public AmountType getAmount() {
+        return amount;
+    }
+
+    public IdentifierType getIdentifier() {
+        return identifier;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final CurrencyValue other = (CurrencyValue) obj;
+        if (this.amount != other.amount && (this.amount == null || !this.amount.equals(other.amount))) {
+            return false;
+        }
+        if (this.identifier != other.identifier && (this.identifier == null || !this.identifier.equals(other.identifier))) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        int hash = 7;
+        hash = 97 * hash + (this.amount != null ? this.amount.hashCode() : 0);
+        hash = 97 * hash + (this.identifier != null ? this.identifier.hashCode() : 0);
+        return hash;
+    }
+
+    /**
+     * Creates new instance.
+     * Generic types of the new instance are derived from types of the parameters.
+     * 
+     * @param <AmountType> type of the currency amount
+     * @param <IdentifierType> type of the currency identifier
+     * @param amount currency amount
+     * @param identifier currency identifier
+     * @return new instance
+     */
+    public static <AmountType, IdentifierType> CurrencyValue<AmountType, IdentifierType> getCurrencyValue(AmountType amount, IdentifierType identifier) {
+        return new CurrencyValue<AmountType, IdentifierType>(amount, identifier);
+    }
+}