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POHow to use a variable in a loop later on
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copied!<p>Im not sure if this is possible and im very new so hopefully some of you can shed some light on this, i have a function that reads all the contents of a txt file then prints this out in a terminal window, however i want to be able to store the data of the text file in a variable so i can use it later on is this possible </p> <p>heres the snip bit of code :</p> <pre><code>String mText; while((mText = br.readLine()) != null) { //Displays the contents of the file in terminal System.out.println(mText); } </code></pre> <p>becuase as i understand it once the loop finishes the contents of the variable mText in this case gets deleted ?</p> <p>ok becuase in my code below, i am wanting to print out to a printer, the contents of that file but when i run it, i can display the contents of the file just fine but it never comes up with printer option box, i thought this would be the problem, it looks like it is something else in my code :</p> <pre><code>import java.awt.*; import java.awt.font.*; import java.awt.geom.*; import java.awt.print.*; import java.text.*; import java.io.*; import javax.swing.*; public class PrintText implements Printable { private static String mText; // 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 { //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")); FileReader fr = new FileReader(path); BufferedReader br = new BufferedReader(fr); String mText; while((mText = br.readLine()) != null) { //Displays the contents of the file in terminal System.out.println(mText); } //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. */ static public void printer(String args[]) { /* 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(new PrintText(), 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) { /* We'll assume that Jav2D is available. */ Graphics2D g2d = (Graphics2D) g; /* Move the origin from the corner of the Paper to the corner * of the imageable area. */ g2d.translate(format.getImageableX(), format.getImageableY()); /* Set the text color. */ g2d.setPaint(Color.black); /* Use a LineBreakMeasurer instance to break our text into * lines that fit the imageable area of the page. */ 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; } } </code></pre> <p>This is the original code i have done, it prints out a pre typed in text in the program, i have tried to add the file reader in as above and now it does not work</p> <pre><code>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 static String mText; // 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 { //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")); FileReader fr = new FileReader(path); BufferedReader br = new BufferedReader(fr); List<String> list = new ArrayList<String>(); while((mText = br.readLine()) != null) { //Displays the contents of the file in terminal System.out.println(mText); list.add(mText); } //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. */ static public void main(String args[]) { /* 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(new PrintText(), 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) { /* We'll assume that Jav2D is available. */ Graphics2D g2d = (Graphics2D) g; /* Move the origin from the corner of the Paper to the corner * of the imageable area. */ g2d.translate(format.getImageableX(), format.getImageableY()); /* Set the text color. */ g2d.setPaint(Color.black); /* Use a LineBreakMeasurer instance to break our text into * lines that fit the imageable area of the page. */ 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; } } </code></pre>

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