在下面的代码中使用 toString() 方法的目的是什么？ [复制]答案

【问题标题】：what would be the purpose of using the toString() method in the code below? [duplicate]在下面的代码中使用 toString() 方法的目的是什么？ [复制]
【发布时间】：2016-05-29 18:51:28
【问题描述】：

据我了解，toString() 方法允许转换类型示例：int x = 5, sys....(x.toString()) 并将 5 打印到控制台。但是与下面的代码相比，这样做的好处/坏处是什么？（不是说我的更好，我真的很好奇）

这是我的代码：

public class GitFiddle {

    //Initalize class variables.
    private String guitarMake;
    private String guitarModel;
    private int numOfStrings;
    private String notes;
    private int jumboFrets;
    private String neckType;
    private String fingerBoard;
    private String humPickUps;
    private boolean tuned;


    //A constructor that has specific variables assigned to it.
    public GitFiddle (String guitarMake, String guitarModel, int    numOfStrings,
    String notes, int jumboFrets, String neckType, String fingerBoard,
    String humPickUps, boolean tuned) {
        this.guitarMake = guitarMake;
        this.guitarModel = guitarModel;
        this.numOfStrings = numOfStrings;
        this.notes = notes;
        this.jumboFrets = jumboFrets;
        this.neckType = neckType;
        this.fingerBoard = fingerBoard;
        this.humPickUps = humPickUps;
        this.tuned = tuned;
    }

    //Created the output that will be displayed to the user. 
    public String output()
    {
        return "My guitar is an " + guitarMake + "," + " " + guitarModel + "  which is a " + 
        numOfStrings + "-string, electric guitar." + "\nThe standard tuning for this guitar is as follows(from low to high): " 
        + notes + "." + "\nIt has " + jumboFrets + " jumbo frets on a " + neckType + ", a " + fingerBoard + 
        " fingerboard and pearl, dot inlays." + "\nIt also has dual " + humPickUps + 
        " humbucker pickups which is perfect for some sweet metal action!" + 
        "\nIs this 7-string beauty tuned up and ready to play?: " + tuned +   "\nAre you ready?";
    }

    public static void main(String args[])
    {
        //Create an instance of household item method.
        GitFiddle guitar = new GitFiddle ("Ibanez", "S-7 320 EX", 7, "B E A D G B E", 22, "Wizard, W-7 II neck", "rosewood", "EMG 81 85", true);

        //Output the status of the household item.
        System.out.println(guitar.output());
    }
}

【问题讨论】：

据我了解，toString() 方法将返回有关仪器的信息，所以它不正是您在 output() 方法中所做的吗？
您的output() 方法本质上是在做toString() 通常做的事情。改变它的名字，你就有了一个toString() 方法。
为什么还要回复一个重复的答案生成的帖子，如果你不愿意在不居高临下的情况下表现出建设性，那么为什么还要回复帖子

标签： java constructor static-methods tostring getter-setter

【解决方案1】：

在接受建议并编辑适当部分后回答：

public class GitFiddle {

    //Initalize class variables.
    private String guitarMake;
    private String guitarModel;
    private int numOfStrings;
    private String notes;
    private int jumboFrets;
    private String neckType;
    private String fingerBoard;
    private String humPickUps;
    private boolean tuned;


    //A constructor that has specific variables assigned to it.
    public GitFiddle (String guitarMake, String guitarModel, int numOfStrings, String notes, int jumboFrets, String neckType, String fingerBoard, String humPickUps, boolean tuned) {
        this.guitarMake = guitarMake;
        this.guitarModel = guitarModel;
        this.numOfStrings = numOfStrings;
        this.notes = notes;
        this.jumboFrets = jumboFrets;
        this.neckType = neckType;
        this.fingerBoard = fingerBoard;
        this.humPickUps = humPickUps;
        this.tuned = tuned;
    }

    //Created the output that will be displayed to the user. 
    public String toString()
    {
        return "My guitar is an " + guitarMake + "," + " " + guitarModel + " which is a " + 
        numOfStrings + "-string, electric guitar." + "\nThe standard tuning for this guitar is as follows(from low to high): " 
        + notes + "." + "\nIt has " + jumboFrets + " jumbo frets on a " + neckType + ", a " + fingerBoard + 
        " fingerboard and pearl, dot inlays." + "\nIt also has dual " + humPickUps + 
        " humbucker pickups which is perfect for some sweet metal action!" + 
        "\nIs this 7-string beauty tuned up and ready to play?: " + tuned +  "\nAre you ready?";
    }

    public static void main(String args[])
    {
        //Create an instance of household item method.
        GitFiddle guitar = new GitFiddle ("Ibanez", "S-7 320 EX", 7, "B E A D G B E", 22, "Wizard, W-7 II neck", "rosewood", "EMG 81 85", true);

        //Output the status of the household item.
        System.out.println(guitar.toString());
    }
}

再次感谢大家！

【讨论】：

您更新我们真是太好了 :) 由于这是在您收到建议之后，您不需要发布答案。您只需要对对您有帮助的答案进行投票，并接受对您帮助最大的答案（如果有的话）。这样一来，您将奖励所有帮助过您的贡献者 :) - 顺便说一句，这个练习很有趣！
哈哈@shlublu，很高兴知道，除了是 java/programming 的新手，我显然对 stackoverflow 还是陌生的，但所有答案都得到了支持，因为他们都帮助并检查了我使用的答案！再次感谢

【解决方案2】：

每个类都已经有一个toString() 方法。你只需要覆盖它。

@Override
public String toString(){
   return output();
}

或者您可以将output() 重命名为toString()

通常 toString() 方法用于获取有关类内容的信息。我

【讨论】：

【解决方案3】：

如果我很好地理解了您的观点，您想为您的对象添加一个 toString() 方法。

实际上，您的 output() 方法可以替换为 toString() 方法（当您要打印对象时会调用该方法）。

public String toString():
    return "My guitar is an " + guitarMake + "," + " " + guitarModel + "  which is a " + 
    numOfStrings + "-string, electric guitar." + "\nThe standard tuning for this guitar is as follows(from low to high): " 
    + notes + "." + "\nIt has " + jumboFrets + " jumbo frets on a " + neckType + ", a " + fingerBoard + 
    " fingerboard and pearl, dot inlays." + "\nIt also has dual " + humPickUps + 
    " humbucker pickups which is perfect for some sweet metal action!" + 
    "\nIs this 7-string beauty tuned up and ready to play?: " + tuned +   "\nAre you ready?";

在你的主要：

System.out.println(guitar); // here toString() method is called to print your guitar object's description.

此外，toString() 方法已经实现（尝试 System.out.println(guitar);），如上将其添加到您的对象将覆盖它。

【讨论】：

【解决方案4】：

将public String output() 更改为public String toString()。你已经建立了它，只是给它起了另一个名字。

【讨论】：

我会删除"My guitar is an " +，因为可以预期toString() 是客观的，但我完全同意。

【解决方案5】：

新建类：

 public class GitFiddle {
    private String guitarMake;
    private String guitarModel;
    private int numOfStrings;
    private String notes;
    private int jumboFrets;
    private String neckType;
    private String fingerBoard;
    private String humPickUps;
    private boolean tuned;

    //A constructor that has specific variables assigned to it.
    public GitFiddle (String guitarMake, String guitarModel, int    numOfStrings,
                      String notes, int jumboFrets, String neckType, String fingerBoard,
                      String humPickUps, boolean tuned) {
        this.guitarMake = guitarMake;
        this.guitarModel = guitarModel;
        this.numOfStrings = numOfStrings;
        this.notes = notes;
        this.jumboFrets = jumboFrets;
        this.neckType = neckType;
        this.fingerBoard = fingerBoard;
        this.humPickUps = humPickUps;
        this.tuned = tuned;
    }


    @Override
    public String toString() {
        return "my guitar Marke is: "+this.guitarMake + " and ,..";
    }

}

【讨论】：

【解决方案6】：

你只需添加一个函数

public String toString(){
 String text = "Your text.";
 return text;
}

到你的班级。就是这样。

【讨论】：

所以我喜欢所有的建议，但是为了保持简单并得到我认为分配的要求，我所做的只是改变：Public String ouput() to Public String toString( ) 并制作 System.out.println 以反映更改，即：guitar.toString());感谢您的所有反馈，希望我在作业中继续保持 100% 的成绩！

【解决方案7】：

有很多奇妙的方法可以做到这一点。但如果你刚刚开始编程，我推荐一种简单的方法：

将此添加到您的代码中。

@Override
public String toString() {
    return "My guitar is an " + guitarMake + "," + " " + guitarModel + "  which is a " + 
    numOfStrings + "-string, electric guitar." + "\nThe standard tuning for this guitar is as follows(from low to high): " 
    + notes + "." + "\nIt has " + jumboFrets + " jumbo frets on a " + neckType + ", a " + fingerBoard + 
    " fingerboard and pearl, dot inlays." + "\nIt also has dual " + humPickUps + 
    " humbucker pickups which is perfect for some sweet metal action!" + 
    "\nIs this 7-string beauty tuned up and ready to play?: " + tuned +   "\nAre you ready?";
}

【讨论】：