在下面的代码中使用toString()方法的目的是什么？

Question

据我理解，toString()方法允许转换类型，例如: int = 5，sys.(x.toString())，它将5打印到控制台。但是，与下面的代码相比，这样做有什么好处/失败呢？(没有说我的更好，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());
    }
}

Answer 1

将public String output()更改为public String toString()。你已经建好了，给它取了个名字。

Answer 2

如果我已经很好地理解了您的观点，那么您希望向对象中添加一个toString()方法。

实际上，您的output()方法可以被toString()方法替换(当您想要打印对象时将调用该方法)。

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?";

在你的主旋律中：

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(吉他)；)，并将其添加到您的对象中，如上面所示，将覆盖它。

Answer 3

每个类都有一个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()。

在一般情况下，toString()方法用于获取有关类内容的信息。我