The pit of the = = symbol in Java

In a technical group to see such an interview topic:

This is the answer of a Java practitioner with 4 years of experience.

What's your answer?

The correct answer is true.

Why?

In fact, when using string A= "a" + "B" +1, the program will create a string buffer pool (string pool), put a into the, when again use stirng b= "AB1", the program first in this String buffer pool to find the same value of the object; Then a, a, object that references the same value.

We can find a lot of data related to string pool.

Related information:

The difference between = = and Equel in Java examples of the concept of the Java String buffer pool (interview questions)

The pit of the = = symbol in Java