jodd-core/src/main/java/jodd/util/ArraysUtil.java
@SuppressWarnings({"unchecked"})
	public static <T> T[] join(T[]... arrays) {
		Class<T> componentType = (Class<T>) arrays.getClass().getComponentType().getComponentType();
		return join(componentType, arrays);
	}
@SuppressWarnings({"unchecked"})
	public static <T> T[] join(T[]... arrays) {
		Class<T> componentType = (Class<T>) arrays.getClass().getComponentType().getComponentType();
		return join(componentType, arrays);
	}
Joins arrays. Component type is resolved from the array argument.