src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Target.java

@@ -59,11 +59,14 @@
 
     /** JDK 8. */
     JDK1_8("1.8", 52, 0),
 
     /** JDK 9. */
-    JDK1_9("1.9", 53, 0);
+    JDK1_9("1.9", 53, 0),
+
+    /** JDK 10, initially an alias for 9 */
+    JDK1_10("1.10", 53, 0);
 
     private static final Context.Key<Target> targetKey = new Context.Key<>();
 
     public static Target instance(Context context) {
         Target instance = context.get(targetKey);

@@ -89,10 +92,11 @@
         tab.put("5", JDK1_5);
         tab.put("6", JDK1_6);
         tab.put("7", JDK1_7);
         tab.put("8", JDK1_8);
         tab.put("9", JDK1_9);
+        tab.put("10", JDK1_10);
     }
 
     public final String name;
     public final int majorVersion;
     public final int minorVersion;

@@ -100,11 +104,11 @@
         this.name = name;
         this.majorVersion = majorVersion;
         this.minorVersion = minorVersion;
     }
 
-    public static final Target DEFAULT = JDK1_9;
+    public static final Target DEFAULT = values()[values().length - 1];
 
     public static Target lookup(String name) {
         return tab.get(name);
     }
 

@@ -144,7 +148,6 @@
     /** Value of platform release used to access multi-release jar files
      */
     public String multiReleaseValue() {
         return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);
     }
-
 }