Value Types Variables contain the values of primitive data types
Value Types In Java, primitive data types such as int, float, double, char, and boolean are called value types A variable of one of these types is a container for one value of its appropriate type counter 7 price 5. 99 found. It false Value types of variables contain their values
Value Types Because a variable of a value type is a container for ONE value of the corresponding type, giving it a second value replaces the first value entirely with the second dependents 2 3
Reference Types in Java Objects of Classes
Reference Types A variable declared as a reference to an object of some class (either a built-in class or a user -defined class) is a reference type A reference variable DOES NOT contain the object to which it refers – instead, it refers to that object (i. e. , it points to that object) A reference variable is null (refers to nothing) until it is given an object for it to reference Reference Actual Object
Reference Types Called a shallow copy because only the reference is copied person. A person. B person. A null person. B null new creates an actual object of type Person initialized to Rachel Walling Two different references now refer to a single actual object
Reference types Just as value types may only have one value at a time, reference types may only refer to one actual instance at a time bob Bob Smith After line 5
Reference types As value types may only have one value at a time, reference types may only refer to one actual instance at a time bob Bob Smith Bob Jones Since nothing refers to this object now, it is destroyed (“garbage collected”) by Java After line 7