代码如下：

/**	 * @comment:Integer 类型数值比较	 * @author:傅里叶级数	 * @date:2018年8月	 * @param args	 */	public static void main(String[] args) {		Integer a =127;		Integer b = 128;		Integer c =127;		Integer d =128;		Integer e=-128;		Integer f = -128;		Integer g = -129;		Integer h = -129;		//打印int类型的hash值：		System.out.println(System.identityHashCode(a));//644117698		System.out.println(System.identityHashCode(c));//644117698				System.out.println(System.identityHashCode(h));//1872034366		System.out.println(System.identityHashCode(g));//1581781576				System.out.println(a==c);//true		System.out.println(b==d);//false		System.out.println(f==e);//true		System.out.println(g==h);//false	}

源码解释：

/**     * Returns an {@code Integer} instance representing the specified     * {@code int} value.  If a new {@code Integer} instance is not     * required, this method should generally be used in preference to     * the constructor {@link #Integer(int)}, as this method is likely     * to yield significantly better space and time performance by     * caching frequently requested values.     *     * This method will always cache values in the range -128 to 127,     * inclusive, and may cache other values outside of this range.     *     * @param  i an {@code int} value.     * @return an {@code Integer} instance representing {@code i}.     * @since  1.5     */    public static Integer valueOf(int i) {        if (i >= IntegerCache.low && i <= IntegerCache.high)            return IntegerCache.cache[i + (-IntegerCache.low)];        return new Integer(i);    }

综上，如果两个Integer的值在[-128,127]之间，==比较返回值为true；否则可能（may）new一个对象，hash地址不同，==返回false。