java - 启动时程序中的条目

这就是现在的样子。不是整个版本，而是我的问题所在。

我希望启动时在程序中有几条狗被添加到寄存器/数组列表中。

boolean toEnd = false;
Scanner keyboard = new Scanner(System.in);
ArrayList<Dog> dogRegister = new ArrayList<Dog>();

while (toEnd == false){

    System.out.println("\nWhat would you like to do? \n Press 1 to register
        a dog. \n Press 2 to get a look at the taillengths of the dogs. \n Press
        3 to delete a dog from the register.\n Press 4 to quit.");
        int command = keyboard.nextInt(); //alternatives stored in "command"

    switch (command){ //Execute chosen command in switch-statement

        case 1: //User registers a dog

        Dog d1 = new Dog();

        Dog d2 = new Dog("Mira", "Miniature Schnauzer", 1, 8);
        Dog d3 = new Dog("Jack", "Jack Russell", 3, 6);
        Dog d4 = new Dog("Charlie", "Pug", 5, 5);
        Dog d5 = new Dog("Max", "Dachshund", 9, 5);
        Dog d6 = new Dog("Bingo", "Golden Retriever", 5, 12);
    }
}

狗类

class Dog {
    private String name;
    private String race;
    private int fage;
    private double fweight;
    private double taillength;

    public Dog() { //Constructor
        this.name = name;
        this.race = race;
        this.fage = fage;
        this.fweight = fweight;
        this.taillength = taillength;
    }
}

最佳答案

只需添加，

   Dog(){
    }

into Dog class.

  通常，编译器会提供构造函数，但只有在这种情况下，
  不要定义任何一个，在这里您定义了一个参数化
  构造函数，因此编译器不会提供任何默认构造函数，因此
  要么添加我建议顶部的默认构造函数，要么总是
  具有适当参数的新对象。