src/java.base/share/classes/java/lang/Byte.java

rev 13019 : 8141678: sun.invoke.util.Wrapper eagerly initializes all integral type caches
Reviewed-by: TBD

@@ -63,10 +63,15 @@
      */
     @SuppressWarnings("unchecked")
     public static final Class<Byte>     TYPE = (Class<Byte>) Class.getPrimitiveClass("byte");
 
     /**
+     * Zero {@code Byte} constant.
+     */
+    private static final Byte ZERO = new Byte((byte)0);
+
+    /**
      * Returns a new {@code String} object representing the
      * specified {@code byte}. The radix is assumed to be 10.
      *
      * @param b the {@code byte} to be converted
      * @return the string representation of the specified {@code byte}

@@ -80,12 +85,14 @@
         private ByteCache(){}
 
         static final Byte cache[] = new Byte[-(-128) + 127 + 1];
 
         static {
-            for(int i = 0; i < cache.length; i++)
-                cache[i] = new Byte((byte)(i - 128));
+            for(int i = 0; i < cache.length; i++) {
+                int val = i - 128;
+                cache[i] = (val == 0) ? ZERO : new Byte((byte)val);
+            }
         }
     }
 
     /**
      * Returns a {@code Byte} instance representing the specified