RFR: 8301042: Need methods to check null elements in an array or a collection

[Tingjun Yuan]

Adding the following methods to check the nullity of elements of an array or a collection:


java.util.Arrays:
public static <E> E[] requireNoNulls(E[] array)
public static <E> E[] requireNoNulls(E[] array, String message)
public static <E> E[] requireNoNulls(E[] array, IntFunction<String> messageGenerator)
public static <E> E[] requireNoNullsCopied(E[] array)
public static <E> E[] requireNoNullsCopied(E[] array, IntFunction<String> messageGenerator)
public static <E> E[] requireNoNullsCopied(E[] array, String message)

java.util.Collections:
public static <C extends Iterable<?>> C requireNoNulls(C collection)
public static <M extends Map<?, ?>> M requireNoNulls(M map)
public static <C extends Iterable<?>> C requireNoNulls(C collection, String message)
public static <M extends Map<?, ?>> M requireNoNulls(M map, String message)
public static <C extends Iterable<?>> C requireNoNulls(C collection, Supplier<String> messageSupplier)
public static <M extends Map<?, ?>> M requireNoNulls(M map, Supplier<String> messageSupplier)
public static <L extends List<?>> L requireNoNulls(L list, IntFunction<String> messageGenerator)

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Commit messages:
 - Update Arrays.java
 - Update Collections.java
 - Fix whitespace
 - Fix whitespace
 - Update Collections.java
 - Update Arrays.java
 - Update Collections.java
 - Update Arrays.java

Changes: https://git.openjdk.org/jdk/pull/12276/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12276&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301042
  Stats: 377 lines in 2 files changed: 377 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12276.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12276/head:pull/12276

PR: https://git.openjdk.org/jdk/pull/12276