代码重构技巧方法

标签：重构   程序员   需求   经验   

得来的，需要在编程中养成一种好习惯，让写好代码成为一种习惯吧！！！！！

1、使用卫语句
在什么情况下可以使用卫语句呢，如下

public void add(Object element) {
		if (!readOnly) {
			int newSize = size + 1;
			if (newSize > elements.length) {
				Object[] newElement = new Object[elements.length + 10];
				for (int i = 0; i < size; i++) {
					newElements[i] = elements[i];
				}
				elements = newElements;
			}
			elements[size++] = element;
		}
	}

public void add(Object element) {
		if (readOnly)
			return;

		int newSize = size + 1;
		if (newSize > elements.length) {
			Object[] newElement = new Object[elements.length + 10];
			for (int i = 0; i < size; i++) {
				newElements[i] = elements[i];
			}
			elements = newElements;
		}
		elements[size++] = element;
	}

public List getUsers(){
		List users = new ArrayList<User>();
		//.........
		//sort by most recently registered users
		Collections.sort(users, new User.UserComparatorByDescendingRegistration());
		return users;
	}

public List getUsers(){
		List users = new ArrayList<User>();
		//.........
		sortByMostRecentlyRegistered(users);
		return users;
	}

void printOwing(double amount){
        printBanner();

        System.out.println("name:" + _name);
        System.out.println("amount" + amount);
    }

void printOwing(double amount){
        printBanner();
        printDetails(amount);
    }

public double getPrice(){
    	double basePrice = _quantity*_itemPrice;
        if (basePrice > 1000){
            return basePrice * 0.95;
        }else{
            return basePrice * 0.98;
        }
    }

public double getPrice(){
        if (BasePrice() > 1000){
            return BasePrice() * 0.95;
        }else{
            return BasePrice() * 0.98;
        }
    }
    
    private int BasePrice(){
        return _quantity* _itemPrice;
    }

private double calculateAverage(){
		Iterator grades = clines.iterator();
		double avg = 0.0;
		while(grades.hasNext()){
			grade = (CourseGrade)grades.next();
			if(!(grade.grade == "F")){
				avg = avg + grade.grade - 64;
			}
		}
		avg = avg / clines.size();
		return avg;
	}

MARKETING_DATA *marketingData = new MARKETING_DATA;
    SALES_DATA *salesData = new SALES_DATA;
    TRAVEL_DATA *travelData = new TRAVEL_DATA;
    
    travelData.ComputeQuarterly();
    salesData.ComputeQuarterly();
    marketingData.ComputeQuarterly();
    
    salesData.ComputeAnnual();
    marketingData.ComputeAnnual();
    travelData.ComputeAnnual();
    
    salesData.print();
    travelData.print();
    marketingData.print();

MARKETING_DATA *marketingData = new MARKETING_DATA;
    marketingData.ComputeQuarterly();
    marketingData.ComputeAnnual();
    
    SALES_DATA *salesData = new SALES_DATA;
    salesData.ComputeQuarterly();
    salesData.ComputeAnnual();
    salesData.print();
    
    TRAVEL_DATA *travelData = new TRAVEL_DATA;
    travelData.ComputeQuarterly();
    travelData.ComputeAnnual();
    travelData.print();

1、http://www.cnblogs.com/matchcolor/archive/2010/08/02/1784888.html

代码重构技巧方法

标签：重构   程序员   需求   经验   

原文地址：http://blog.csdn.net/deng0zhaotai/article/details/44461879