Summary

Update core libraries for JDK 26 by adding an enum constant to ClassFileFormatVersion and a constant to ClassFile.

Problem

With a new release, ClassFileFormatVersion and ClassFile need constants to model that release.

Solution

Add the new constants. As a consequence of defining new constants, the behavior of the ClassFile.latestMajorVersion() and ClassFileFormatVersion.latest() methods is updated accordingly.

Specification

diff --git a/src/java.base/share/classes/java/lang/classfile/ClassFile.java b/src/java.base/share/classes/java/lang/classfile/ClassFile.java
index 4b529c39099..216facbdddf 100644
--- a/src/java.base/share/classes/java/lang/classfile/ClassFile.java
+++ b/src/java.base/share/classes/java/lang/classfile/ClassFile.java
@@ -1030,6 +1030,14 @@ default List<VerifyError> verify(Path path) throws IOException {
      */
     int JAVA_25_VERSION = 69;

+    /**
+     * The class major version introduced by Java SE 26, {@value}.
+     *
+     * @see ClassFileFormatVersion#RELEASE_26
+     * @since 26
+     */
+    int JAVA_26_VERSION = 70;
+
     /**
      * A minor version number {@value} indicating a class uses preview features
      * of a Java SE release since 12, for major versions {@value
@@ -1041,7 +1049,7 @@ default List<VerifyError> verify(Path path) throws IOException {
      * {@return the latest class major version supported by the current runtime}
      */
     static int latestMajorVersion() {
-        return JAVA_25_VERSION;
+        return JAVA_26_VERSION;
     }

     /**
diff --git a/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java b/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java
index 70eb921a124..4a63dd157f8 100644
--- a/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java
+++ b/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java
@@ -371,6 +371,18 @@ public enum ClassFileFormatVersion {
      * <cite>The Java Virtual Machine Specification, Java SE 25 Edition</cite></a>
      */
     RELEASE_25(69),
+
+    /**
+     * The version introduced by the Java Platform, Standard Edition
+     * 26.
+     *
+     * @since 26
+     *
+     * @see <a
+     * href="https://docs.oracle.com/javase/specs/jvms/se26/html/index.html">
+     * <cite>The Java Virtual Machine Specification, Java SE 26 Edition</cite></a>
+     */
+    RELEASE_26(70),
     ; // Reduce code churn when appending new constants

     // Note to maintainers: when adding constants for newer releases,
@@ -386,7 +398,7 @@ private ClassFileFormatVersion(int major) {
      * {@return the latest class file format version}
      */
     public static ClassFileFormatVersion latest() {
-        return RELEASE_25;
+        return RELEASE_26;
     }

     /**