java==比较int值问题

Question

Integer a = 127; //Integer.valueOf(127)
Integer b = 127; //Integer.valueOf(127)
log.info(a == b); // true

Integer c = 128; //Integer.valueOf(128)
Integer d = 128; //Integer.valueOf(128)
log.info(c == d); //false

Integer e = 127; //Integer.valueOf(127)
Integer f = new Integer(127); //new instance
log.info(e == f); //false

Integer g = new Integer(127); //new instance
Integer h = new Integer(127); //new instance
log.info(g == h); //false

Integer i = 128;
int j = 128;
log.info(i == j); //true

谁知道以上是为什么呀

Answer 1

https://www.cnblogs.com/ryelqy/p/11014766.html
这个文章解释了为啥127行，128不行
Integer也是封装对象，值相等判断还是用equals吧