Question

我正在尝试创建一个带有文件类型参数的构造函数（例如，公共TextRead（File textFile））。我将如何编写此构造函数，以便在main方法中实例化时可以使用在我使用JFileChooser在main方法中选择的文件中？

我想简单地说一下，我如何将使用文件选择器选择的文件放入构造函数的参数中？我需要如何设置构造函数才能使其正常工作？

//My main method has this
public static void main(String[] args)
{
    JFileChooser fileChooser = new JFileChooser();
    Scanner in = null;
    if(fileChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
    {
        //Constructor goes here to read the file I selected using the file chooser
    }
}

//The class that has the constructor
public class TextRead
{
    public TextRead(File textFile)
    {
        //What do I need to write here
    }
}

Answer 1

根据this documentation。您只需要使用fileChooser.getSelectedFile()。然后您的代码应该像这样

//My main method has this
public static void main(String[] args) {
    JFileChooser fileChooser = new JFileChooser();
    Scanner in = null;
    if(fileChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
        //Constructor goes here to read the file I selected using the file chooser
        TextRead textRead = new TextRead(fileChooser.getSelectedFile());
    }
}

//The class that has the constructor
public class TextRead {
    private File file;  

    public TextRead(File textFile) {
        this.file = textFile; 
    }
}

如何在另一个将读取文件然后在main方法中实例化的类中创建构造函数？

1 个答案: