4 个 byte 4 × 8 个 bit 00000000 00000000 00000000 00000000 int 取值范围在正负 21 亿之间，这也解释了黄子韬直播间为啥点赞变为负数，因为溢出了 ```java public final class Integer extends Number implements Comparable<Integer> { public static final int MIN_VALUE = -21 4748 3648; public static final int MAX_VALUE = 21 4748 3647; ``` int 取值范围在正负 21 亿之间，这也解释了黄子韬直播间为啥点赞变为负数，因为溢出了 ```java public final class Integer extends Number implements Comparable<Integer> { public static final int MIN_VALUE = -21 4748 3648; public static final int MAX_VALUE = 21 4748 3647; ```