Question

public static void main(String[] args) {

/*The following is the code to a Class containing two elements, name and boardFootage. I'll get the data from a Scanner, store it in an ArrayList in my Furniture object, then print out the items of the ArrayList in ascending order. 
*/

    class Furniture implements Comparable<Furniture> {
        public String toString() {
            return getName() + ": " + getBoardFootage() + "\n";
        }

        private String name;
        private double boardFootage;

        Furniture() {
            name = "";
            boardFootage = 0.0;
        }

        Furniture(String nameInput, double boardFootageInput) {
            name = nameInput;
            boardFootage = boardFootageInput;
        }


        public String getName() 
        {
            Scanner keyboard = new Scanner(System.in);
            String name = "";
            while (!name.equalsIgnoreCase("quit"))
            {
                name = keyboard.next();
                if (name == "quit") {
                    System.out.println("Project Summary");
                    // PRINT LIST SORTED BY PROJECT SIZE FROM SMALLEST
                    // TO LARGEST USING Collections.sort METHOD
                }
            }
            return name;
        }


        public void setName(String name) {
            Scanner keyboard = new Scanner(System.in);
            this.name = keyboard.next();
        }


        public double getBoardFootage() {
            Scanner keyboard = new Scanner(System.in);
            double boardFootage = 0.0;
            boardFootage = keyboard.nextDouble();
            return boardFootage;
        }


        public void setBoardFootage(double boardFottage) {
            Scanner keyboard = new Scanner(System.in);
            this.boardFootage = keyboard.nextDouble();
        }

        public int compareTo(Furniture o) {
            if (this.boardFootage < o.boardFootage) {
                return -1;
            } else if (this.boardFootage > o.boardFootage) {
                return 1;
            }
            return this.name.compareTo(o.name);
        }
    }



    Furniture furniture = new Furniture();

    ArrayList<Furniture> furnitureList = new ArrayList<Furniture>();

Answer 1

你随时可以的方式？

//furnitureRef is a reference to a member of the list
for( Furniture furnitureRef : furnitureList ) {
    //Do stuff with furnitureRef
}

这看起来像是一个家庭作业问题，所以我很谨慎，如果没有你至少尝试自己做一些事情就给予更多帮助。

此外，通常接受的方法是为您定义的每个对象创建一个toString方法。这个toString函数应该返回一个对象的字符串，序列化，如：

class Car {
    String make;
    String model;

    public String toString() {
        return "{ make: " + make + " model: "+model+" }"; 
    }
}

这将允许你写：

//furnitureRef is a reference to a member of the list
for( Furniture furnitureRef : furnitureList ) {
    System.out.println( furnitureRef.toString() );
}

如何打印包含带有数据的对象的ArrayList？

1 个答案: