我如何可以覆盖在Java中一个ArrayList的toString方法？ [英] How can I override the toString method of an ArrayList in Java?

问题描述

我想有自己的执行toString（）方法的在Java的ArrayList。但是，我不能得到，即使我说我的toString（）像这样包含的ArrayList类能够正常工作。

I would like to have my own implementation of the toString() method for an ArrayList in Java. However, I can't get it working even though I added my toString() like this to the class that contains the ArrayList.

@Override
public String toString() {
    String result = "+";
    for (int i = 0; i < list.size(); i++) {
        result += " " + list.get(i);
    }
    return result;
}

当我打电话给我的ArrayList这样的 list.toString（），我还是得到默认的重新presentation。我缺少的东西吗？

When I call my ArrayList like this list.toString(), I still get the default representation. Am I missing something?

推荐答案

您应该做这样的事情。

public static String listToString(List<?> list) {
    String result = "+";
    for (int i = 0; i < list.size(); i++) {
        result += " " + list.get(i);
    }
    return result;
}

和传递名单 listToString的参数（）。您的可以的技术上延长的ArrayList （无论是与一个匿名类或具体的）和实施的toString 自己，但似乎没有必要在这里。

and pass the list in as an argument of listToString(). You can technically extend ArrayList (either with an anonymous class or a concrete one) and implement toString yourself, but that seems unnecessary here.

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