A number of minor cleanups could be done in Arrays and Collections utility classes.
In Arrays:
- Redundant import jdk.internal.misc.Unsafe;
- C-style array declaration is used in public static boolean equals(short[] a, short a2[]) (that's the only place in the whole file)

In Collections:
- A few obsolete "unchecked" and "rawtypes" suppressions
- Unnecessary local variable initializer in get() method
- Raw type can be avoided in a number of casts
- Explicit type parameters could be omitted or converted to diamonds
- A couple of javadoc links on private APIs are malformed