621 }
622 high = h;
623
624 cache = new Integer[(high - low) + 1];
625 int j = low;
626 for(int k = 0; k < cache.length; k++)
627 cache[k] = new Integer(j++);
628 }
629
630 private IntegerCache() {}
631 }
632
633 /**
634 * Returns an {@code Integer} instance representing the specified
635 * {@code int} value. If a new {@code Integer} instance is not
636 * required, this method should generally be used in preference to
637 * the constructor {@link #Integer(int)}, as this method is likely
638 * to yield significantly better space and time performance by
639 * caching frequently requested values.
640 *
641 * @param i an {@code int} value.
642 * @return an {@code Integer} instance representing {@code i}.
643 * @since 1.5
644 */
645 public static Integer valueOf(int i) {
646 assert IntegerCache.high >= 127;
647 if (i >= IntegerCache.low && i <= IntegerCache.high)
648 return IntegerCache.cache[i + (-IntegerCache.low)];
649 return new Integer(i);
650 }
651
652 /**
653 * The value of the {@code Integer}.
654 *
655 * @serial
656 */
657 private final int value;
658
659 /**
660 * Constructs a newly allocated {@code Integer} object that
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621 }
622 high = h;
623
624 cache = new Integer[(high - low) + 1];
625 int j = low;
626 for(int k = 0; k < cache.length; k++)
627 cache[k] = new Integer(j++);
628 }
629
630 private IntegerCache() {}
631 }
632
633 /**
634 * Returns an {@code Integer} instance representing the specified
635 * {@code int} value. If a new {@code Integer} instance is not
636 * required, this method should generally be used in preference to
637 * the constructor {@link #Integer(int)}, as this method is likely
638 * to yield significantly better space and time performance by
639 * caching frequently requested values.
640 *
641 * This method will always cache values in the range -128 to 127,
642 * inclusive, and may cache other values outside of this range.
643 *
644 * @param i an {@code int} value.
645 * @return an {@code Integer} instance representing {@code i}.
646 * @since 1.5
647 */
648 public static Integer valueOf(int i) {
649 assert IntegerCache.high >= 127;
650 if (i >= IntegerCache.low && i <= IntegerCache.high)
651 return IntegerCache.cache[i + (-IntegerCache.low)];
652 return new Integer(i);
653 }
654
655 /**
656 * The value of the {@code Integer}.
657 *
658 * @serial
659 */
660 private final int value;
661
662 /**
663 * Constructs a newly allocated {@code Integer} object that
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