重写toString方法 [英] Overriding toString method

问题描述

我正在使用.toString返回对象的字符串表示形式，即

I am using .toString to return a string representation of an object, i.e.

jcb.engineMove(move.toString());

将产生e2e4.

我想做的是将这个对象(e2e4)的文本提取为字符串.谷歌搜索后，我遇到了重写toString方法的问题，所以我想到了:

What I am trying to do is to extract the text of this object (e2e4) as a string. After Googling I came across overriding the toString method so I came up with this:

@Override
public String toString() {
    String s = "";
    int newRank = getRank();
    int newFile = getFile();
    final Move move = new Move(rank, file, newRank, newFile);
    s+="" + move;
    return s;
}

我的问题很基本:

1. 这是正确的方法
2. 在尝试获取对象的文本时如何调用此例程?

推荐答案

覆盖 Object.toString 是一个好方法.

但是，您当前的实现通过创建一个新的 Move 对象(见下文)而犯了一个重大错误.

However, your current implementation makes a major mistake by creating a new Move object (see below).

要调用例程(一旦您修复了该例程)，请完全执行您已经在做的事情:

To call the routine (once you fix it), do exactly what you're already doing:

jcb.engineMove(move.toString());

如果 toString()仅应用于调试(如mre所说)，则可以实现另一个名为 getText 的方法，该方法具有相同的作用.

If toString() should only be used for debugging (as mre says) you could implement another method named getText that does the same thing.

重要提示:

您不应在其 toString 方法内创建一个新的 Move 对象.

You should not be creating a new Move object inside its toString method.

这是一个非常糟糕的主意(正如其他人提到的那样).

This is a very bad idea (as mentioned by others).

您的 toString 方法应该只构建一个字符串并将其返回.

Your toString method should simply build a string and return it.

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