Arrays.java has two occurrences of bad unicode constants in Javadoc.

src/java.base/share/classes/java/util/Arrays.java:3619: * the original, the copy will contain {@code '\\u000'}. Such indices
src/java.base/share/classes/java/util/Arrays.java:3945: * {@code '\\u000'} is placed in all elements of the copy whose index is

both cases require an extra zero.