如何为对象的 ArrayList 创建 toString 方法? [英] How do I create a toString method for an ArrayList of objects?

问题描述

我的任务是为 ArrayList 中的每个对象创建一个 toString() 方法.我不知道该怎么做.这是带有 ArrayList

I am tasked with creating a toString() method for each and every object in an ArrayList. I have no idea how to go about doing this. This is the class with the ArrayList

public class DogManager {
    private ArrayList<Dog> dogList;

    public DogManager() {
        this.dogList = new ArrayList<Dog>();
    }

    public void addDog(String nameOfDog) {
        this.dogList.add(new Dog(nameOfDog));
    }

    public String toString() {
        String results = "+";
        for (int i = 0; i < this.dogList.size(); i++) {
            results += " " + this.dogList.get(i);
        }
        return results;
    }
}

我知道 toString() 是错误的，但我不知道如何让它返回该列表中每个对象的描述.

I know the toString() is wrong, but I can't figure out how to make it return a description for each of the objects in that list.

推荐答案

你已经接近了.我能想到的最简单的方法是也为 Dog 实现 toString().然后在您的 DogManager 类中，您可以遍历每个 Dog 并调用它的 toString().

You are close. The easiest way I can think of is to also implement toString() for Dog. Then in your DogManager class you can loop through each Dog and call its toString().

即:

public String toString() {
    String results = "+";
    for(Dog d : dogList) {
        results += d.toString(); //if you implement toString() for Dog then it will be added here
    }
    return results;
  }
}

您也可以随意格式化.我注意到有些答案用,"分隔每只狗

edit: You can also format it however you like. I notice some answers separate each Dog by ","

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