object
an entity or data type that we create in java.
class
they contain instance fields or data that belong to the object and methods that are used to manipulate the data
Precedence
the order of operations in java
static variable
the variable belongs to the class itself, and is initialized only once at the start of the execution
immutable
the state of the object doesn’t change since it has been initialized
Method usage
when using methods of a class, remember the parameters used to call the method need to match the data types of the arguments of the defined method