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Old Jul 18th, 2005, 9:24 AM   #1
JavaDummy
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Join Date: Jun 2005
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Try without catch
Hi there,

Having some problems with this Student Menu i've been doing. The menu works now, but on the final method ( Report on Courses ), i get a try without catch error, when both are stated and initilised.

(Toggle Plain Text) 
import java.io.*;
public class StudentMenu {

public static void main (String args[]) throws IOException
{
	PrintWriter Student = new PrintWriter (new FileWriter("F:/Students.txt"));

String choicemenu;
int choice;
boolean Finished = false;
DataInputStream kbd = new DataInputStream(System.in);
while (Finished == false) {

System.out.println(" ******Student Data******");
System.out.println(" Please make a choice ");
System.out.println(" 1 to 4 ");
System.out.println(" 1. Add Data ");
System.out.println(" 2. Find Data ");
System.out.println(" 3. Report On Courses ");
System.out.println(" 4. Quit ");
choicemenu = kbd.readLine();
choice = Integer.parseInt(choicemenu);
switch (choice) {
	     case 1: {
			 	 AddData ();
	     	     };break;
	     case 2: {
			 	 FindData ();
	     	     };break;
	     case 3: {
			     Report ();
	     	     };break;
	     case 4: {
			 	 Finished = true;
			 	 }
			 	;break;
	     default: System.out.println("That's not a valid option");
	     ;break	;
}
}
}
public static void AddData () throws java.io.IOException{
	String StudentName,temp;
	String StudentNameTemp;
	int StudentID;
	String StudentIDTemp;
	int x,mark;
	String marktemp;
	int coursecode;
	String coursecodeTemp;
	int Finished = 1;
	String f = "F:/Students.txt";
	PrintWriter out = new PrintWriter(new FileWriter(f));
	DataInputStream kbd = new DataInputStream(System.in);

	while (Finished == 1) {

	System.out.println("Add Data Selected");

	System.out.println(" Enter Student Name ");
	StudentName = kbd.readLine();

	System.out.println(" Enter mark ");
	marktemp = kbd.readLine();
	mark = Integer.parseInt(marktemp);

	System.out.println("Enter Course Code");
	coursecodeTemp = kbd.readLine();
	coursecode = Integer.parseInt(coursecodeTemp);

	System.out.println("Enter Student ID");
	StudentIDTemp = kbd.readLine();
	StudentID = Integer.parseInt(StudentIDTemp);

	            out.println(StudentName);
	            out.println(mark);
	            out.println(coursecode);
	            out.println(StudentID);

System.out.println("Continue Y =1 N = 2");
	temp = kbd.readLine();
	x = Integer.parseInt(temp) ;
	if (x == 2)
				Finished = -1;

}
out.close();
}
public static void FindData ()  {
	System.out.println("Find Data");
	String filenames = "F:/Students.txt";
	String StudentName,coursecode;
	int mark, StudentID;
	int code;
	int count = 0;
	String course;
	DataInputStream kbd = new DataInputStream(System.in);
	try {
		System.out.println("Enter Course Code");
		course = kbd.readLine();
		code = Integer.parseInt(course);


	            FileReader file = new FileReader("F:/Students.txt");
	            BufferedReader in = new BufferedReader(file);
	            String line;
	            while((line = in.readLine()) !=null) {
					if (count % 4 == 0) StudentName = line;
					if (count % 4 == 1) mark = Integer.parseInt(line);
					if (count % 4 == 2) coursecode = line;
					if (count % 4 == 3) StudentID = Integer.parseInt(line);
					if (coursecode.compareTo(course) == 0) {

	                System.out.println(StudentName);
	                System.out.println(mark);
	                System.out.println(StudentID);
					}
				}

	            in.close();
	        }
	        catch (IOException e) {
	            System.out.println("Input file not found!");
        }

}
public static void Report () {
	String StudentName = null;
	int coursecode = 0;
	int StudentID = 0;
	int mark = 0;
	try {
	System.out.println("Print report on Courses");
		FileReader file = new FileReader("F:/Students.txt");
		BufferedReader in = new BufferedReader(file);
		String line;
	            while((line = in.readLine()) !=null) {

				System.out.print("coursecode    ");
				System.out.print("StudentName   ");
				System.out.print("StudentID     ");
				System.out.print("mark   ");
				System.out.print(coursecode);
				System.out.print(StudentName);
				System.out.print(StudentID);
				System.out.print(mark);
			}
			in.close();
			catch (IOException e) {
		    System.out.println("Input file not found!");
        }
}
}
}

This is the error I get:

F:\HND Computing\Unit 8 - Introduction to Programming\StudentMenu.java:149: 'catch' without 'try'
catch (IOException e) {
^
F:\HND Computing\Unit 8 - Introduction to Programming\StudentMenu.java:132: 'try' without 'catch' or 'finally'
try {
^
2 errors

Tool completed with exit code 1

-

I can't seem to eradicate the error and it's stopping the whole thing from working. Any ideas?

Steve
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Old Jul 18th, 2005, 9:55 AM   #2
JavaDummy
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Posts: 10
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This is my code now, slightly different:

(Toggle Plain Text) 
import java.io.*;
public class StudentMenu {

public static void main (String args[]) throws IOException
{
	PrintWriter Student = new PrintWriter (new FileWriter("F:/Students.txt"));

String choicemenu;
int choice;
boolean Finished = false;
DataInputStream kbd = new DataInputStream(System.in);
while (Finished == false) {

System.out.println(" ******Student Data******");
System.out.println(" Please make a choice ");
System.out.println(" 1 to 4 ");
System.out.println(" 1. Add Data ");
System.out.println(" 2. Find Data ");
System.out.println(" 3. Report On Courses ");
System.out.println(" 4. Quit ");
choicemenu = kbd.readLine();
choice = Integer.parseInt(choicemenu);
switch (choice) {
	     case 1: {
			 	 AddData ();
	     	     };break;
	     case 2: {
			 	 FindData ();
	     	     };break;
	     case 3: {
			     Report ();
	     	     };break;
	     case 4: {
			 	 Finished = true;
			 	 }
			 	;break;
	     default: System.out.println("That's not a valid option");
	     ;break	;
}
}
}
public static void AddData () throws java.io.IOException{
	String StudentName,temp;
	String StudentNameTemp;
	int StudentID;
	String StudentIDTemp;
	int x,mark;
	String marktemp;
	int coursecode;
	String coursecodeTemp;
	int Finished = 1;
	String f = "F:/Students.txt";
	PrintWriter out = new PrintWriter(new FileWriter(f));
	DataInputStream kbd = new DataInputStream(System.in);

	while (Finished == 1) {

	System.out.println("Add Data Selected");

	System.out.println(" Enter Student Name ");
	StudentName = kbd.readLine();

	System.out.println(" Enter mark ");
	marktemp = kbd.readLine();
	mark = Integer.parseInt(marktemp);

	System.out.println("Enter Course Code");
	coursecodeTemp = kbd.readLine();
	coursecode = Integer.parseInt(coursecodeTemp);

	System.out.println("Enter Student ID");
	StudentIDTemp = kbd.readLine();
	StudentID = Integer.parseInt(StudentIDTemp);

	            out.println(StudentName);
	            out.println(mark);
	            out.println(coursecode);
	            out.println(StudentID);

System.out.println("Continue Y =1 N = 2");
	temp = kbd.readLine();
	x = Integer.parseInt(temp) ;
	if (x == 2)
				Finished = -1;

}
out.close();
}
public static void FindData ()  {
	System.out.println("Find Data");
	String filenames = "F:/Students.txt";
	String StudentName,coursecode;
	int mark, StudentID;
	int code;
	int count = 0;
	String course;
	DataInputStream kbd = new DataInputStream(System.in);
	try {
		System.out.println("Enter Course Code");
		course = kbd.readLine();
		code = Integer.parseInt(course);


	            FileReader file = new FileReader("F:/Students.txt");
	            BufferedReader in = new BufferedReader(file);
	            String line;
	            while((line = in.readLine()) !=null) {
					if (count % 4 == 0) StudentName = line;
					if (count % 4 == 1) mark = Integer.parseInt(line);
					if (count % 4 == 2) coursecode = line;
					if (count % 4 == 3) StudentID = Integer.parseInt(line);
					if (coursecode.compareTo(course) == 0) {

	                System.out.println(StudentName);
	                System.out.println(mark);
	                System.out.println(StudentID);
					}
				}

	            in.close();
	        }
	        catch (IOException e) {
	            System.out.println("Input file not found!");
        }

}
public static void Report () {
	String StudentName = null;
	int coursecode = 0;
	int StudentID = 0;
	int mark = 0;

	System.out.println("Print report on Courses");
	try {
		FileReader file = new FileReader("F:/Students.txt");
		BufferedReader in = new BufferedReader(file);
		String line;
	            while((line = in.readLine()) !=null) {

				System.out.print("coursecode    ");
				System.out.print("StudentName   ");
				System.out.print("StudentID     ");
				System.out.print("mark   ");
				System.out.print(coursecode);
				System.out.print(StudentName);
				System.out.print(StudentID);
				System.out.print(mark);
		}
			in.close();
			}

			catch (IOException e) {
		    System.out.println("Input file not found!");
}
}
}

Now it tells me when i try and run it it tells me there's an exception in the main thread - the only other errors that occur are that it says some of the variables might not have been initiliased - which of course they have.

I am getting very frustrated with this. Please help

Steve
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Old Jul 18th, 2005, 10:08 AM   #3
Ooble
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Tried throwing a try/catch around the entire contents of the main function and echoing the exception details?
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Old Jul 18th, 2005, 3:46 PM   #4
xavier
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At line 92 and 92 :
(Toggle Plain Text) 
String StudentName="",coursecode="";
int mark=0, StudentID=0;
I initialised them for you.

Oh, and please stop using those absolute paths it's anoying.
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Old Jul 30th, 2005, 5:20 PM   #5
JeffHeaton
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Try it like this, compiles just fine now.

Jeff
http://www.heatonresearch.com

(Toggle Plain Text) 
import java.io.*;
public class StudentMenu {

public static void main (String args[]) throws IOException
{
	PrintWriter Student = new PrintWriter (new FileWriter("F:/Students.txt"));

String choicemenu;
int choice;
boolean Finished = false;
DataInputStream kbd = new DataInputStream(System.in);
while (Finished == false) {

System.out.println(" ******Student Data******");
System.out.println(" Please make a choice ");
System.out.println(" 1 to 4 ");
System.out.println(" 1. Add Data ");
System.out.println(" 2. Find Data ");
System.out.println(" 3. Report On Courses ");
System.out.println(" 4. Quit ");
choicemenu = kbd.readLine();
choice = Integer.parseInt(choicemenu);
switch (choice) {
	     case 1: {
			 	 AddData ();
	     	     };break;
	     case 2: {
			 	 FindData ();
	     	     };break;
	     case 3: {
			     Report ();
	     	     };break;
	     case 4: {
			 	 Finished = true;
			 	 }
			 	;break;
	     default: System.out.println("That's not a valid option");
	     ;break	;
}
}
}
public static void AddData () throws java.io.IOException{
	String StudentName,temp;
	String StudentNameTemp;
	int StudentID;
	String StudentIDTemp;
	int x,mark;
	String marktemp;
	int coursecode;
	String coursecodeTemp;
	int Finished = 1;
	String f = "F:/Students.txt";
	PrintWriter out = new PrintWriter(new FileWriter(f));
	DataInputStream kbd = new DataInputStream(System.in);

	while (Finished == 1) {

	System.out.println("Add Data Selected");

	System.out.println(" Enter Student Name ");
	StudentName = kbd.readLine();

	System.out.println(" Enter mark ");
	marktemp = kbd.readLine();
	mark = Integer.parseInt(marktemp);

	System.out.println("Enter Course Code");
	coursecodeTemp = kbd.readLine();
	coursecode = Integer.parseInt(coursecodeTemp);

	System.out.println("Enter Student ID");
	StudentIDTemp = kbd.readLine();
	StudentID = Integer.parseInt(StudentIDTemp);

	            out.println(StudentName);
	            out.println(mark);
	            out.println(coursecode);
	            out.println(StudentID);

System.out.println("Continue Y =1 N = 2");
	temp = kbd.readLine();
	x = Integer.parseInt(temp) ;
	if (x == 2)
				Finished = -1;

}
out.close();
}
public static void FindData ()  {
	System.out.println("Find Data");
	String filenames = "F:/Students.txt";
	String StudentName,coursecode;
	int mark, StudentID;
	int code;
	int count = 0;
	String course;
	DataInputStream kbd = new DataInputStream(System.in);
	try {
		System.out.println("Enter Course Code");
		course = kbd.readLine();
		code = Integer.parseInt(course);


	            FileReader file = new FileReader("F:/Students.txt");
	            BufferedReader in = new BufferedReader(file);
	            String line;
	            while((line = in.readLine()) !=null) {
					if (count % 4 == 0) StudentName = line;
					if (count % 4 == 1) mark = Integer.parseInt(line);
					if (count % 4 == 2) coursecode = line;
					if (count % 4 == 3) StudentID = Integer.parseInt(line);
					if (coursecode.compareTo(course) == 0) {

	                System.out.println(StudentName);
	                System.out.println(mark);
	                System.out.println(StudentID);
					}
				}

	            in.close();
	        }
	        catch (IOException e) {
	            System.out.println("Input file not found!");
        }

}
public static void Report () {
	String StudentName = null;
	int coursecode = 0;
	int StudentID = 0;
	int mark = 0;

	System.out.println("Print report on Courses");
	try {
		FileReader file = new FileReader("F:/Students.txt");
		BufferedReader in = new BufferedReader(file);
		String line;
	            while((line = in.readLine()) !=null) {

				System.out.print("coursecode    ");
				System.out.print("StudentName   ");
				System.out.print("StudentID     ");
				System.out.print("mark   ");
				System.out.print(coursecode);
				System.out.print(StudentName);
				System.out.print(StudentID);
				System.out.print(mark);
		}
			in.close();
			}

			catch (IOException e) {
		    System.out.println("Input file not found!");
}
}
}
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