Why "==" working differently for strings in java

Question

let's take strings as

a ="a"
b="b"
c=a+b // so it will be "ab"
d = "ab"

Then why a & d are not equal as per the following code
https://code.sololearn.com/cIU375SG6BhG/?ref=app

Answer 1

== compare references for strings and objects.. Not the conntents.
Use equals() method for comparing content.
c, d reference are different so returns false.

Try :
d = c; now both will have same reference so returns true..
Hope it helps..