Need help filling in the areas, unsure of how to do the code, JAVA. I\'ve highli

Question

 Need help filling in the areas, unsure of how to do the code, JAVA. I've highlited what needs completing. 

   import java.io.File ; import java.io.FileNotFoundException ; import java.io.PrintWriter ; import java.util.Scanner ; import javax.swing.JFileChooser ; import javax.swing.JOptionPane ; /**    LineNumbererChooser shows how to use the JFileChooser.    You will set it to the file "input1" in the current directory.    The program reads input1 and prepends each line with a line number.    For example, if the following is the input file (input1):  Mary had a little lamb whose fleece was white as snow. Every where that Mary went, the lamb was sure to go.     Then the following is the output file (ignoring the // comment symbols) */  //    /* 1 */ Mary had a little lamb //    /* 2 */ whose fleece was white as snow. //    /* 3 */ Every where that Mary went, //    /* 4 */ the lamb was sure to go. public class LineNumbererChooser {     //-----------Start below here. To do: approximate lines of code = 1     // 1. public static void main( ... so that file IO is possible without catching a possible FileNotFoundException          //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.     {         JOptionPane.showMessageDialog(null, "In the next file dialog box, please choose the file: input1") ;         JFileChooser jfc = new JFileChooser(".") ; //set to current directory         File infile = null ;         if (jfc.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {             //-----------Start below here. To do: approximate lines of code = 1             // 2. set infile to the file returned by message getSelectedFile() sent to jfc                          //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.         }         else              infile = new File("LineNumbererChooser.java") ;         Scanner scanner = new Scanner(infile) ;         PrintWriter pw = new PrintWriter("output1") ;         int lineNumber = 1 ;         //-----------Start below here. To do: approximate lines of code = 4         // 3-6. Write the while loop that goes threw the input file and prints the output file line by line with the commented line numbers.                                                      //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.         long length1 = infile.length() ;         pw.close() ;         scanner.close() ;         //This next part is just to show what is in the output file         infile = new File("output1") ;         scanner = new Scanner(infile) ;         while (scanner.hasNextLine()) {             System.out.println(scanner.nextLine()) ;         }         long length2 = infile.length() ;         if (length2 <= length1)             System.out.println("Error: You have to print to the given output file.") ;     } } 

Explanation / Answer

please find my answers below for each of 3 parts.

1.  public static void main(String[] args) throws FileNotFoundException

2.  infile = jfc.getSelectedFile();

3. while (scanner.hasNextLine())

  {

pw.println("/* " + lineNumber + "*/ " + scanner.nextLine());

lineNumber++;

  }

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