1

到目前为止，这个论坛上的各位给了我很大的帮助，我学到了很多东西，但是我确实有一个（希望是）最后一个问题，我的代码无法编译，我收到以下错误：

 no suitable constructor found for AttributedString(java.util.List<java.lang.String>) 
constructor java.text.ArributedString(java.text.AttributedCharacterator,int,int,java.text.AttributedCharacterator.Attribute[]) is not applicable (actual and formal argument lists differ in length

当我收到上述错误时，突出显示以下代码行：

AttributedString mStyledText = new AttributedString(list);

在另一个线程的帮助下有人建议这是因为我传递的是整个字符串列表而不是单个字符串。

是什么导致了这个错误？更重要的是我如何克服它

代码如下

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.print.*;
import java.text.*;
import java.io.*;
import javax.swing.*;
import java.util.List;
import java.util.ArrayList;

public class PrintText implements Printable {

    private String text; // Constructor argument for AttributedString.

    // Below the code will allow the user to select a file and then print out the contents of the file
    public static void main(String[] args) throws IOException {
        new PrintText();
    }

    public PrintText() {
        EventQueue.invokeLater(new Runnable() {
                @Override
                public void run() {
                    try {
                        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    }

                    //selects the file
                    JFileChooser chooser = new JFileChooser();
                    chooser.showOpenDialog(null);
                    File file = chooser.getSelectedFile();
                    String filename = file.getName();
                    //System.out.println("You have selected: " + filename);  testing to see if file seleected was right
                    String path = file.getAbsolutePath();

                    //Reads contents of file into terminal 
                    //FileReader fr = new FileReader("filename");
                    // FileReader fr = new FileReader("D:/Documents/" + "filename")); 

                    BufferedReader br = null;
                    try {
                        br = new BufferedReader(new FileReader(path));
                        StringBuilder stringBuilder = new StringBuilder();
                        String line;
                        while ((line = br.readLine()) != null) {
                            System.out.println(line);
                            stringBuilder.append(line).append("\n");
                        }
                        text = stringBuilder.toString();;

                        printer();
                    } catch (IOException exp) {
                        exp.printStackTrace();
                    } finally {
                        try {
                            br.close();
                        } catch (Exception e) {
                        }
                    }
                    //fr.close(); 
                }
            });
    }
    //private static final String mText = 
    //    "This is a test to see if this text will be printed "; //This works perfectly fine
    //AttributedString mStyledText = new AttributedString(mText);
    /**
     * Print a single page containing some sample text.
     */
    public void printer() {

        /* Get the representation of the current printer and 
         * the current print job.
         */
        PrinterJob printerJob = PrinterJob.getPrinterJob();
        /* Build a book containing pairs of page painters (Printables)
         * and PageFormats. This example has a single page containing
         * text.
         */
        Book book = new Book();
        book.append(this, new PageFormat());
        /* Set the object to be printed (the Book) into the PrinterJob.
         * Doing this before bringing up the print dialog allows the
         * print dialog to correctly display the page range to be printed
         * and to dissallow any print settings not appropriate for the
         * pages to be printed.
         */
        printerJob.setPageable(book);
        /* Show the print dialog to the user. This is an optional step
         * and need not be done if the application wants to perform
         * 'quiet' printing. If the user cancels the print dialog then false
         * is returned. If true is returned we go ahead and print.
         */
        boolean doPrint = printerJob.printDialog();
        if (doPrint) {
            try {
                printerJob.print();
            } catch (PrinterException exception) {
                System.err.println("Printing error: " + exception);
            }
        }
    }

    /**
     * Print a page of text.
     */
    public int print(Graphics g, PageFormat format, int pageIndex) {

        AttributedString mStyledText = new AttributedString(); 
        Graphics2D g2d = (Graphics2D) g;
        g2d.translate(format.getImageableX(), format.getImageableY());
        g2d.setPaint(Color.black);// Sets text colour
        Point2D.Float pen = new Point2D.Float();
        AttributedCharacterIterator charIterator = mStyledText.getIterator();
        LineBreakMeasurer measurer = new LineBreakMeasurer(charIterator, g2d.getFontRenderContext());
        float wrappingWidth = (float) format.getImageableWidth();
        while (measurer.getPosition() < charIterator.getEndIndex()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            pen.y += layout.getAscent();
            float dx = layout.isLeftToRight() ? 0 : (wrappingWidth - layout.getAdvance());
            layout.draw(g2d, pen.x + dx, pen.y);
            pen.y += layout.getDescent() + layout.getLeading();
        }
        return Printable.PAGE_EXISTS;
    }
}

将上面的代码更新为我现在正在运行的代码

4

4 回答 4

3

这些是该类的有效构造函数：

AttributedString(AttributedCharacterIterator text)
AttributedString(AttributedCharacterIterator text, int beginIndex, int endIndex)
AttributedString(AttributedCharacterIterator text, int beginIndex, int endIndex, AttributedCharacterIterator.Attribute[] attributes)
AttributedString(String text)
AttributedString(String text, Map<? extends AttributedCharacterIterator.Attribute,?> attributes)

它们都不接受字符串列表，因此您需要重新考虑传递给它的内容。可能：

list.get(0);
于 2012-12-23T01:20:28.793 回答
2

如果您查看AttributedString的 API，则没有将 List 作为参数的构造函数。因此，当您尝试将 List 传递给它时会出现编译时错误。

AttributedString mStyledText = new AttributedString(list);

以下是唯一允许的构造函数AttributedString class

AttributedString(AttributedCharacterIterator text)
AttributedString(AttributedCharacterIterator text, int beginIndex, int endIndex)
AttributedString(AttributedCharacterIterator text, int beginIndex, int endIndex, AttributedCharacterIterator.Attribute[] attributes)
AttributedString(String text)
AttributedString(String text, Map<? extends AttributedCharacterIterator.Attribute,?> attributes)
于 2012-12-23T01:20:38.523 回答
1

没有接受 a 的构造函数List<String>。

考虑到AttributedString处理单个字符串值，将列表传递给它没有意义。

也许你想要一个列表，即List<AttributedString>？在这种情况下，循环List<String>调用String构造函数并添加到List<AttributedString>.

于 2012-12-23T01:22:28.437 回答
1

使用 StringBuilder 构建单个字符串。

代替

private List<String> list;

...

                    // Wrong: List<String> list = new ArrayList<String>();
                    list = new ArrayList<String>(); //
                    String line;
                    while ((line = br.readLine()) != null) {
                        System.out.println(line);
                        list.add(line);
                    }

经过

private String text; // Constructor argument for AttributedString.

...

                    StringBuilder stringBuilder = new StringBuilder();
                    String line;
                    while ((line = br.readLine()) != null) {
                        System.out.println(line);
                        stringBuilder.append(line).append("\n");
                    }
                    text = stringBuilder.toString();
于 2012-12-23T01:24:00.627 回答