rename

This refactoring I use most often and is one of the most useful refactoring. All too often we do not name methods/classes/parameters properly that leads to a misunderstanding as to what the method/class/parameter’s function is. When this occurs, assumptions are made and bugs are introduced to the system. As simple of a refactoring this seems, it is one of the most important to leverage.

public class Person
{
     private String FN;
     public String getFN() {
		return FN;
	}
	public void setFN(String fN) {
		this.FN = fN;
	}
	public double ClcHrlyPR() {
        // code to calculate hourly payrate
        return 0.0;
    }
}

As you can see here, we have a class/method/parameter that all have very non-descriptive, obscure names. They can be interpreted in a number of different ways. Applying this refactoring is as simple as renaming the items at hand to be more descriptive and convey what exactly they do. Simple enough.

public class Person
{
     private String firstName;
     public String getFirstName() {
		return firstName;
	}
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	public double calculateHourlyPayRate() {
        // code to calculate hourly payrate
        return 0.0;
    }
}

Original C# Code from the book

public class Person
{
    public string FN { get; set; }

    public decimal ClcHrlyPR()
    {
        // code to calculate hourly payrate
        return 0m;
    }
}

// Changed the class name to Employee
public class Employee
{
    public string FirstName { get; set; }

    public decimal CalculateHourlyPay()
    {
        // code to calculate hourly payrate
        return 0m;
    }
}