You might know that Java passes by value, but it helps to understand why. Here's what happens when you pass mutable and immutable object references in Java.

When the code is first executed, we will enter the main() method and initialize number to the value of 10.; We will then output the value of number before calling the change() method.; In the change() ...

The Default is Pass By Value. Which can be the reason why concepts like Shallow Copy And Deep Copy are so popular in Java. Java also works same as JS, It has both as default, but in different cases.