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() ...

* Java always passes arguments _by value_, NOT by reference. 1. Declaring a reference named `f` of type `Foo` and assign it a new object of type `Foo` with an attribute `"f"`. 2. From the method side, ...