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Thread: File not found exception

  1. #1
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    Default File not found exception

    I am using JGrasp. I am trying to write to a file. I am getting a file not found exception:

    Monthly_pay.java:50: error: unreported exception FileNotFoundException; must be caught or declared to be thrown
    PrintWriter outFile = new PrintWriter("C:\\program.txt");
    ^

    from what I read the book said that the file would not have to be there to output to the file. It said it would create it. So I don't understand
    why the exception?

    Here is my code:

    import javax.swing.*;
    import java.io.*;
     
    public class Monthly_pay
    {
    	static final double FED_TAX = .15;
    	static final double STATE_TAX = .035;
    	static final double SS_TAX = .0575;
    	static final double MEDICARE = .0275;
    	static final double PENSION = .05;
    	static final double HEALTH_INS = 75.00;
     
    	public static void main(String[] args)
    	{
    		String name, grossPay, outPut, dollarSign;
    		double netPay, dGrossPay, fedTax, stateTax, ssTax, medicare, pension, healthIns;
     
    		JOptionPane jop = new JOptionPane();
     
    		name = jop.showInputDialog("Please enter the employee name: ");
    		grossPay = jop.showInputDialog("Please enter the employee's gross pay: ");
     
    		dGrossPay = Double.parseDouble(grossPay);
     
    		fedTax = dGrossPay * FED_TAX;
    		stateTax = dGrossPay * STATE_TAX;
    		ssTax = dGrossPay * SS_TAX;
    		medicare = dGrossPay * MEDICARE;
    		pension = dGrossPay * PENSION;
    		netPay = dGrossPay - (fedTax + stateTax + ssTax + medicare + pension + HEALTH_INS);
     
    		dollarSign = "$";
    		outPut = "Here is the break down of" + " "  + name + "'s" + " " +
    		      "monthly pay. $" + "\n"
    		      + "Gross pay: $" +  String.format("%.2f", dGrossPay) + "\n"
    		      + "Federal Tax: $" + String.format("%.2f", fedTax) + "\n"
    		      + "State Tax: $" + String.format("%.2f", stateTax) + "\n"
    		      + "Social Security Tax: $" + String.format("%.2f", ssTax) + "\n"
    		      + "Medicare / Medicade: $" + String.format("%.2f", medicare) + "\n"
    		      + "Pension Plan: $" + String.format("%.2f", pension) + "\n"
    		      + "Health Insurance: $" + String.format("%.2f", HEALTH_INS) + "\n"
    		      + "Net Pay: $" + String.format("%.2f", netPay);
     
     
    		jop.showMessageDialog(null, outPut);
     
    		PrintWriter outFile = new PrintWriter("C:\\program.txt");
     
     
     
    		outFile.printf(outPut);
     
    		outFile.close();	
     
    		System.exit(0);
     
     
    	}
    }


  2. #2
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    Default Re: File not found exception

    Quote Originally Posted by mwr76 View Post
    I am using JGrasp. I am trying to write to a file. I am getting a file not found exception:

    Monthly_pay.java:50: error: unreported exception FileNotFoundException; must be caught or declared to be thrown
    PrintWriter outFile = new PrintWriter("C:\\program.txt");
    ^

    from what I read the book said that the file would not have to be there to output to the file. It said it would create it. So I don't understand
    why the exception?

    Here is my code:

    import javax.swing.*;
    import java.io.*;
     
    public class Monthly_pay
    {
    	static final double FED_TAX = .15;
    	static final double STATE_TAX = .035;
    	static final double SS_TAX = .0575;
    	static final double MEDICARE = .0275;
    	static final double PENSION = .05;
    	static final double HEALTH_INS = 75.00;
     
    	public static void main(String[] args)
    	{
    		String name, grossPay, outPut, dollarSign;
    		double netPay, dGrossPay, fedTax, stateTax, ssTax, medicare, pension, healthIns;
     
    		JOptionPane jop = new JOptionPane();
     
    		name = jop.showInputDialog("Please enter the employee name: ");
    		grossPay = jop.showInputDialog("Please enter the employee's gross pay: ");
     
    		dGrossPay = Double.parseDouble(grossPay);
     
    		fedTax = dGrossPay * FED_TAX;
    		stateTax = dGrossPay * STATE_TAX;
    		ssTax = dGrossPay * SS_TAX;
    		medicare = dGrossPay * MEDICARE;
    		pension = dGrossPay * PENSION;
    		netPay = dGrossPay - (fedTax + stateTax + ssTax + medicare + pension + HEALTH_INS);
     
    		dollarSign = "$";
    		outPut = "Here is the break down of" + " "  + name + "'s" + " " +
    		      "monthly pay. $" + "\n"
    		      + "Gross pay: $" +  String.format("%.2f", dGrossPay) + "\n"
    		      + "Federal Tax: $" + String.format("%.2f", fedTax) + "\n"
    		      + "State Tax: $" + String.format("%.2f", stateTax) + "\n"
    		      + "Social Security Tax: $" + String.format("%.2f", ssTax) + "\n"
    		      + "Medicare / Medicade: $" + String.format("%.2f", medicare) + "\n"
    		      + "Pension Plan: $" + String.format("%.2f", pension) + "\n"
    		      + "Health Insurance: $" + String.format("%.2f", HEALTH_INS) + "\n"
    		      + "Net Pay: $" + String.format("%.2f", netPay);
     
     
    		jop.showMessageDialog(null, outPut);
     
    		PrintWriter outFile = new PrintWriter("C:\\program.txt");
     
     
     
    		outFile.printf(outPut);
     
    		outFile.close();	
     
    		System.exit(0);
     
     
    	}
    }
    You have to handle the exception. That is what the compiler is complaining about
    Last edited by kc120us; September 10th, 2011 at 01:05 PM.

  3. #3
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    Default Re: File not found exception

    This is the thrown exception:

    Exception in thread "main" java.io.FileNotFoundException: C:\program.txt (Access is denied)
    at java.io.FileOutputStream.open(Native Method)

    We haven't gotten to handling exceptions. Does it have to be handled to figure out why its being thrown?

  4. #4
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    Default Re: File not found exception

    Quote Originally Posted by mwr76 View Post
    This is the thrown exception:

    Exception in thread "main" java.io.FileNotFoundException: C:\program.txt (Access is denied)
    at java.io.FileOutputStream.open(Native Method)

    We haven't gotten to handling exceptions. Does it have to be handled to figure out why its being thrown?
    In your main method, you have to either throw the Exception or put your I/O statements in a try/catch block. Try looking here to figure out how to do it. Catching and Handling Exceptions (The Java™ Tutorials > Essential Classes > Exceptions)

  5. #5
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    Default Re: File not found exception

    Quote Originally Posted by mwr76 View Post
    This is the thrown exception:

    Exception in thread "main" java.io.FileNotFoundException: C:\program.txt (Access is denied)
    at java.io.FileOutputStream.open(Native Method)

    We haven't gotten to handling exceptions. Does it have to be handled to figure out why its being thrown?
    The stack trace the exception prints (automatically if the exception is not caught, using the printStackTrace() method if you catch the exception) should have ample description...in your case an access denied based upon a FileNotFound. Make sure the file is in the correct location, and file name in the code is the same

    FYI, you should try and distinguish between a compile time versus runtime problem. Your original post concerned compile time, this latter case is runtime. Big difference.

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