Why the output is true and false?

Question

Question is:

Integer i1=127;
Integer i2=127;
System.out.print(i1==i2);
i1=128;
i2=128;
System.out.print(i1==i2);

Can anyone tell me why output is 'true false'?

Answer 1

Sure

Java stores integers till 127 as primitive and you can compare primitives with == operator

However Integer x = 128 is not primitive - it's a wrapper class and should be compared using proper methods

i1.CompareTo(i2);

Read more about it here (object interning)

https://stackoverflow.com/questions/10149959/using-operator-in-java-to-compare-wrapper-objects

Answer 2

Thank you HNNX 🐿