Improve links, primarily to Guava and the JDK.

- Use https.
- Link to docs.oracle.com instead of download.oracle.com.
- Link to guava.dev instead of google.github.io/guava.
- Link to `snapshot-jre` instead of `snapshot`, consistent with what we do in our `README` and in shortlinks like guava.dev/ImmutableList. (Consistency might help the snapshot docs in search-engine ratings, as touched upon in discussions of `<link rel="canonical" ...>` in b/69667335 and #7597.)
- Link to JDK 25 and Guava's head/snapshot docs.
  - But continue to link to JDK 7 for a few `Forwarding*` classes that specifically want to show which methods existed at that point.
  - And continue to link to earlier JDKs when I couldn't easily find equivalents in newer JDKs' docs, like for assertions and try-with-resources (though I was still sometimes able to bump the version slightly, like from 7 to 8 for spurious wakeups and multicatch).
  - But I did find equivalents for various docs (e.g., jar spec, crypto spec, serialization spec), albeit with rather different URLs.
  - In one Google-internal class, I noticed that the newer JLS has a section title that doesn't match the old section title, so I changed the link text to match the new title.
  - In `ImmutableCollection`, I noticed that the relevant link to `Set` needed to change from `#immutable` to `#unmodifiable`.
- Use `#foo(A,B)` instead of `#foo-A-B-`, as required by modern Javadoc.
  - I also noticed one appearance of a stray `%20` (in "Object common methods"), which I removed.
  - In `MacHashFunctionTest`, I added the new link but kept the old one in place, since the old one matches the list in the source code. Possibly we should update the source code to match the new list.
- Update a couple Spring links in the EventBus `README`.
- Fix a wiki link about range-check elimination in `Utf8`.

One thing that did **not** do was change links to point to shortlinks like guava.dev/ImmutableList. Maybe I should.

RELNOTES=n/a
PiperOrigin-RevId: 862868752

Author: cpovirk

android/guava-tests/test/com/google/common/base/PreconditionsTest.java

@@ -426,7 +426,7 @@ private static ImmutableList<ImmutableList<Class<?>>> allSignatures(Class<?> pre
   // 'test' to demonstrate some potentially ambiguous overloads.  This 'test' is kind of strange,
   // but essentially each line will be a call to a Preconditions method that, but for a documented
   // change would be a compiler error.
-  // See http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.12.2 for the spec on
+  // See https://docs.oracle.com/javase/specs/jls/se25/html/jls-15.html#jls-15.12.2 for the spec on
   // how javac selects overloads
   @SuppressWarnings("null")
   public void overloadSelection() {

android/guava-tests/test/com/google/common/collect/FluentIterableTest.java

@@ -165,8 +165,8 @@ static class B implements X, Y {}
    * This test passes if the {@code concat(…).filter(…).filter(…)} statement at the end compiles.
    * That statement compiles only if {@link FluentIterable#concat concat(aIterable, bIterable)}
    * returns a {@link FluentIterable} of elements of an anonymous type whose supertypes are the <a
-   * href="https://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls-4.9">intersection</a> of
-   * the supertypes of {@code A} and the supertypes of {@code B}.
+   * href="https://docs.oracle.com/javase/specs/jls/se25/html/jls-4.html#jls-4.9">intersection</a>
+   * of the supertypes of {@code A} and the supertypes of {@code B}.
    */
   public void testConcatIntersectionType() {
     Iterable<A> aIterable = ImmutableList.of();

android/guava-tests/test/com/google/common/hash/MacHashFunctionTest.java

@@ -54,7 +54,9 @@ public class MacHashFunctionTest extends TestCase {
   private static final SecretKey SHA512_KEY =
       new SecretKeySpec("secret key".getBytes(UTF_8), "HmacSHA512");
 
-  // From http://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Mac
+  // From https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Mac
+  // TODO(cpovirk): Evaluate newer list:
+  // https://docs.oracle.com/en/java/javase/25/docs/specs/security/standard-names.html#mac-algorithms
   private static final ImmutableTable<String, SecretKey, HashFunction> ALGORITHMS =
       new ImmutableTable.Builder<String, SecretKey, HashFunction>()
           .put("HmacMD5", MD5_KEY, Hashing.hmacMd5(MD5_KEY))

android/guava-tests/test/com/google/common/hash/MessageDigestHashFunctionTest.java

@@ -37,7 +37,7 @@ public class MessageDigestHashFunctionTest extends TestCase {
   private static final ImmutableSet<String> INPUTS = ImmutableSet.of("", "Z", "foobar");
 
   // From "How Provider Implementations Are Requested and Supplied" from
-  // http://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html
+  // https://docs.oracle.com/en/java/javase/25/security/java-cryptography-architecture-jca-reference-guide.html#:~:text=How%20Provider%20Implementations%20Are%20Requested%20and%20Supplied
   //  - Some providers may choose to also include alias names.
   //  - For example, the "SHA-1" algorithm might be referred to as "SHA1".
   //  - The algorithm name is not case-sensitive.

android/guava/src/com/google/common/base/CharMatcher.java

@@ -41,7 +41,7 @@
  * assigned characters, including important CJK characters and emoji.
  *
  * <p>Supplementary characters are <a
- * href="https://docs.oracle.com/javase/8/docs/api/java/lang/Character.html#supplementary">encoded
+ * href="https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/Character.html#supplementary">encoded
  * into a {@code String} using surrogate pairs</a>, and a {@code CharMatcher} treats these just as
  * two separate characters. {@link #countIn} counts each supplementary character as 2 {@code char}s.
  *

android/guava/src/com/google/common/base/Strings.java

@@ -233,7 +233,7 @@ static boolean validSurrogatePairAt(CharSequence string, int index) {
    * <p><b>Note:</b> For most string-formatting needs, use {@link String#format String.format},
    * {@link java.io.PrintWriter#format PrintWriter.format}, and related methods. These support the
    * full range of <a
-   * href="https://docs.oracle.com/javase/9/docs/api/java/util/Formatter.html#syntax">format
+   * href="https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/Formatter.html#syntax">format
    * specifiers</a>, and alert you to usage errors by throwing {@link
    * java.util.IllegalFormatException}.
    *

android/guava/src/com/google/common/collect/ImmutableCollection.java

@@ -95,8 +95,9 @@
  * <p>Expressing the immutability guarantee directly in the type that user code references is a
  * powerful advantage. Although Java offers certain immutable collection factory methods, such as
  * {@link Collections#singleton(Object)} and <a
- * href="https://docs.oracle.com/javase/9/docs/api/java/util/Set.html#immutable">{@code Set.of}</a>,
- * we recommend using <i>these</i> classes instead for this reason (as well as for consistency).
+ * href="https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/Set.html#unmodifiable">{@code
+ * Set.of}</a>, we recommend using <i>these</i> classes instead for this reason (as well as for
+ * consistency).
  *
  * <h4>Creation</h4>
  *

android/guava/src/com/google/common/io/Closer.java

@@ -32,7 +32,7 @@
 /**
  * A {@link Closeable} that collects {@code Closeable} resources and closes them all when it is
  * {@linkplain #close closed}. This was intended to approximately emulate the behavior of Java 7's
- * <a href="http://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html"
+ * <a href="https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html"
  * >try-with-resources</a> statement in JDK6-compatible code. Code using this should be
  * approximately equivalent in behavior to the same code written with try-with-resources.
  *

android/guava/src/com/google/common/math/IntMath.java

@@ -383,7 +383,7 @@ public static int divide(int p, int q, RoundingMode mode) {
    * }
    *
    * @throws ArithmeticException if {@code m <= 0}
-   * @see <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.17.3">
+   * @see <a href="https://docs.oracle.com/javase/specs/jls/se25/html/jls-15.html#jls-15.17.3">
    *     Remainder Operator</a>
    */
   public static int mod(int x, int m) {

android/guava/src/com/google/common/math/LongMath.java

@@ -444,7 +444,7 @@ public static long divide(long p, long q, RoundingMode mode) {
    * }
    *
    * @throws ArithmeticException if {@code m <= 0}
-   * @see <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.17.3">
+   * @see <a href="https://docs.oracle.com/javase/specs/jls/se25/html/jls-15.html#jls-15.17.3">
    *     Remainder Operator</a>
    */
   @GwtIncompatible // TODO
@@ -468,7 +468,7 @@ public static int mod(long x, int m) {
    * }
    *
    * @throws ArithmeticException if {@code m <= 0}
-   * @see <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.17.3">
+   * @see <a href="https://docs.oracle.com/javase/specs/jls/se25/html/jls-15.html#jls-15.17.3">
    *     Remainder Operator</a>
    */
   @GwtIncompatible // TODO