### Question:
Key { @Override public String toString() { StringBuilder buffer = new StringBuilder(); buffer.append("<BindingKey: "); buffer.append(typeLiteral); if (bindingName != null) { buffer.append(", '").append(bindingName).append('\''); } buffer.append('>'); return buffer.toString(); } protected  Key(TypeLiteral<T> type, String bindingName); static Key<T> get(Class<T> type); static Key<T> get(Class<T> type, String bindingName); static Key<List<T>> getListOf(Class<T> type); static Key<List<T>> getListOf(Class<T> type, String bindingName); static Key<Map<K, V>> getMapOf(Class<K> keyType, Class<V> valueType); static Key<Map<K, V>> getMapOf(Class<K> keyType, Class<V> valueType, String bindingName); @SuppressWarnings("unchecked") Class<T> getType(); String getBindingName(); @Override boolean equals(Object object); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testToString() { assertEquals("<BindingKey: java.lang.String>", Key.get(String.class).toString()); assertEquals("<BindingKey: java.lang.String, 'xyz'>", Key.get(String.class, "xyz").toString()); assertEquals("<BindingKey: java.util.List[java.lang.String]>", Key.getListOf(String.class).toString()); assertEquals("<BindingKey: java.util.List[java.lang.String], 'xyz'>", Key.getListOf(String.class, "xyz").toString()); }