CS202 Java-3
CS202
Introduction to Java
lIn Java, we treat
everything as an object
We can have objects
of primitive types (like int, float, char) or objects of class types.
Objects of
primitive types can be created in the same way that we do in C++ (e.g., int object;)
Objects of class types cannot be created this way.
First, we must create identifiers for objects that we
desire these are actually
references to objects
Then, we must allocate memory on the heap for instances
So, when we
say: List obj; we have created only a reference not an object. If you want to send a message
to obj (i.e., call a member
function), you will get an error because
obj isnt actually pointing to anything:
List obj = new List();
So, for a string object we could say:
String s = CS202!; or
String s = new String(CS202!);