到目前为止，你们在这个论坛上一直是一个很好的帮助，我学到了很多东西，但是我确实有一个（希望）的最后一个问题，我的代码没有编译，我获取错误：
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
当我获得上述错误时，请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了整个字符串列表，而不是一个字符串。
是什么导致此错误？更重要的是我如何克服它
代码在
下面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;
}
}
将上述代码更新为我现在正在运行的
这些是类的有效构造函数：
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)
它们都没有列出字符串，因此您需要重新考虑您所传递的内容。可能：
list.get(0);
如果您查看属性string 的API，则没有构造器将列表作为参数。因此，当您尝试将其传递给列表时，您会遇到编译时间错误。
AttributedString mStyledText = new AttributedString(list);
以下是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)
使用StringBuilder构建一个单字符串。
替换
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);
}
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();
没有构造函数接受 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。
也许您想要一个列表，即List<AttributedString>？在这种情况下，循环循环List<String>调用String构造函数并添加到List<AttributedString>。