Feature Envy

When a class wants to access way too much of another class's internals - it wants to be a part of that other class and get all of its data. Sometimes, this is unavoidable howerver in order to avoid tight internal coupling and provide proper abstraction.

public class HourlyEmployeeReport {
    private HourlyEmployee employee ;
    public HourlyEmployeeReport(HourlyEmployee e) {
        this.employee = e;
    }
    String reportHours() {
        return String.format(
            "Name: %s\tHours:%d.%1d\n",
            employee.getName(),
            employee.getTenthsWorked()/10,
            employee.getTenthsWorked()%10);
    }
}

Here the reportHours function "envies" the data inside of employee; however we don't want to expose how the employee report is formatted (string.format) to the employee, who doesn't care about this information. Thus we will leave it as is.