发现个有趣的

1 Integer i5 = 127;//编译的时候,被翻译成-> Integer i5 = Integer.valueOf(127);
2 Integer i6 = 127;
3 System.out.println(i5 == i6);
4 
5 Integer i5 = 128;
6 Integer i6 = 128;
7 System.out.println(i5 == i6)；

public static Integer valueOf(int i) {
         assert IntegerCache.high >= 127;
         if (i >= IntegerCache.low && i <= IntegerCache.high)
             return IntegerCache.cache[i + (-IntegerCache.low)];
        return new Integer(i);
}