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A class declaration tells the compiler what your class will be called, what data it will contain, and what methods it will have. For example, in Java and C# it looks roughly like this:
class MyClass {
private int x;
private int y;
public MyClass(int px, int py) {
x = px;
y = py;
}
public int sumXY() {
return x + y;
}
}
This declares a class called 'MyClass' with two data elements (or variables), called 'x' and 'y'. They are integers (whole numbers). The class has a constructor method (constructor methods always have the same name as the class, so the constructor method is also called 'MyClass'). You give two numbers to the constructor method, and it fills in the two numbers in the MyClass object with those two numbers.
The class also has another method, called 'sumXY', which returns the sum of the two numbers the object contains.
The 'public' and 'private' are used to determine who can or can't see the variables and methods of your class. If a variable or method is marked 'private', it can only be seen by methods inside the class. If it's marked 'public', other classes can reach inside and look at it or even change it.
Hope this helps.
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∙ 8y ago
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