Developers use variables in Java to hold data, with all variables having a data type and a name. The data type determines the values that ... Called primitive types, integral and floating point ...

Primitive types ... the JDK hold data as objects. If a developer has a set of int values they want to store in an ArrayList, it can’t be done. Unless, of course, they use a corresponding wrapper class ...

Therefore, even though Java passes parameters to methods by value, if the variable points to an object reference, the real object will also be changed. Like object types, primitive types are also ...