src/main/java/org/fest/assertions/ObjectArrayAssert.java
public @NotNull ObjectArrayAssert hasAllElementsOfType(@NotNull Class<?> type) {
    checkNotNull(type);
    isNotNull();
    for (Object o : actual) {
      if (type.isInstance(o)) {
        continue;
      }
      failIfCustomMessageIsSet();
      fail(format("not all elements in array:<%s> belong to the type:<%s>", actual, type));
    }
    return this;
  }
public @NotNull ObjectArrayAssert hasAllElementsOfType(@NotNull Class<?> type) {
    checkNotNull(type);
    isNotNull();
    for (Object o : actual) {
      if (type.isInstance(o)) {
        continue;
      }
      failIfCustomMessageIsSet();
      fail(format("not all elements in array:<%s> belong to the type:<%s>", actual, type));
    }
    return this;
  }
Verifies that all the elements in the actual {@code Object} array belong to the specified type. Matching includes
subclasses of the given type.
<p/>
For example, consider the following code listing:
<pre>
Number[] numbers = { 2, 6, 8 };
assertThat(numbers).hasAllElementsOfType(Integer.class);
</pre>
<p/>
The assertion {@code hasAllElementsOfType} will be successful.

@param type the expected type.
@return this assertion object.
@throws NullPointerException if the given type is {@code null}.
@throws AssertionError       if the component type of the actual {@code Object} array is not the same as the specified
one.