Objects

Computer Science: OCR A Level, topic 2.4.10

Objects

Objects are made from classes.

Creating an Object

Creating an Object

Objects are created from classes.
To create an object we use the keyword new and the name of the class:
MyClass myObj = new MyClass();

Accessing attributes

Accessing attributes

If an attribute of an object is public, then it can be accessed from outside the class.
Object attributes are accessed using dot notation:
int attr = myObj.attr;

Calling methods

Calling methods

If a method of an object is public, then it can be accessed from outside the class.
Object methods are accessed using dot notation:
myObj.doSomething();

Test yourself on Objects

Which keyword is used to create an object?
How would the attribute name of the class myClass be accessed?

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