Scope

Definition:

Scope refers to the lifetime and accessibility of a variable. How large the scope is depends on where a variable is declared. For example, if a variable is declared at the top of a class then it will accessible to all of the class methods. If it’s declared in a method then it can only be used in that method.

For more information, have a look at the Understanding Variable Scope and Using Modifiers With Variables.

Examples:

For example, the scope of the variable NUMBER_OF_HOURS_IN_A_DAY is the whole class. Whereas the scope of NUMBER_OF_DAYS_IN_A_WEEK is just the calculateHoursInWeeks method:


public class AllAboutHours{
private final int NUMBER_OF_HOURS_IN_A_DAY = 24;
public int calculateHoursInDays(int days)
{
return days * NUMBER_OF_HOURS_IN_A_DAY;
}
public int calculateHoursInWeeks(int weeks)
{
final int NUMBER_OF_DAYS_IN_A_WEEK = 7;
return weeks * NUMBER_OF_DAYS_IN_A_WEEK * NUMBER_OF_HOURS_IN_A_DAY;
}
}