源码看JAVA【十】Short

1、最大值与最小值

     /**
     * A constant holding the minimum value a {@code short} can
     * have, -2<sup>15</sup>.
     */
    public static final short   MIN_VALUE = -32768;

    /**
     * A constant holding the maximum value a {@code short} can
     * have, 2<sup>15</sup>-1.
     */
    public static final short   MAX_VALUE = 32767;

2、ShortCache

定义缓存-128~127

     private static class ShortCache {
        private ShortCache(){}

        static final Short cache[] = new Short[-(-128) + 127 + 1];

        static {
            for(int i = 0; i < cache.length; i++)
                cache[i] = new Short((short)(i - 128));
        }
    }

3、hashCode与equals

返回相应的short值

     /**
     * Returns a hash code for a {@code short} value; compatible with
     * {@code Short.hashCode()}.
     *
     * @param value the value to hash
     * @return a hash code value for a {@code short} value.
     * @since 1.8
     */
    public static int hashCode(short value) {
        return (int)value;
    }

    /**
     * Compares this object to the specified object.  The result is
     * {@code true} if and only if the argument is not
     * {@code null} and is a {@code Short} object that
     * contains the same {@code short} value as this object.
     *
     * @param obj       the object to compare with
     * @return          {@code true} if the objects are the same;
     *                  {@code false} otherwise.
     */
    public boolean equals(Object obj) {
        if (obj instanceof Short) {
            return value == ((Short)obj).shortValue();
        }
        return false;
    }

4、其余与Integer功能类似