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Nov 14th, 2008

Need help in code

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I am new at java.
I am making an address book program.
Below is a code of the Search class.
Could anyone please look into it?
The program is giving a problem while runtime.

Java Syntax (Toggle Plain Text)
import java.io.*;
import java.util.*;
class search
{
	private String str,sval;
	private String arr[]=new String[8];
	char ch1='y',ch2;
	private int n,ctr;
	clear c1=new clear();
	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 
	public void calc()throws IOException
	{
		DataInputStream in=new DataInputStream(new FileInputStream("adbk.txt"));			//file read
		System.out.println("How would you like to search?");
		System.out.println("1)by fn");
		System.out.println("2)by ln");
		System.out.println("3)by area code");
		System.out.println("4)by city");
		System.out.println("5)by state");
		System.out.println("enter choice:");
		n=Integer.parseInt(br.readLine())-1;
		c1.clr();																			//clr here
 
		switch(n)
		{
			case 1:
			{
				System.out.println("enter fn");
			}
			case 2:
			{
				System.out.println("enter ln");
			}
			case 3:
			{
				System.out.println("enter arcd");
			}
			case 4:
			{
				System.out.println("enter city");
			}
			case 5:
			{
				System.out.println("enter state");
			}
			default:
			{
				System.out.println("error");
				break;
			}
		}
		sval=br.readLine();
 
 
				c1.clr();																			//clr here
 
 
		while(in.available()!=0)
		{
			str=in.readLine();
			StringTokenizer st=new StringTokenizer(str," ");
			for(int i=0;i<8;i++)
			{
				arr[i]=st.nextToken();
			}
 
			if(sval==arr[n])
			{
				ctr++;
				for(int i=0;i<8;i++)
				{
					System.out.print(arr[i]+" ");
					System.out.println();
				}
			}
		}
 
		System.out.println("Total hits="+ctr);
 
	}
	public static void main(String args[])
		{
			search s=new search();
 
			try
			{
				s.calc();
			}
 
			catch(IOException e)
			{
				System.out.println("error");
			}
		}
}
import java.io.*;
import java.util.*;
class search
{
	private String str,sval;
	private String arr[]=new String[8];
	char ch1='y',ch2;
	private int n,ctr;
	clear c1=new clear();
	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

	public void calc()throws IOException
	{
		DataInputStream in=new DataInputStream(new FileInputStream("adbk.txt"));			//file read
		System.out.println("How would you like to search?");
		System.out.println("1)by fn");
		System.out.println("2)by ln");
		System.out.println("3)by area code");
		System.out.println("4)by city");
		System.out.println("5)by state");
		System.out.println("enter choice:");
		n=Integer.parseInt(br.readLine())-1;
		c1.clr();																			//clr here

		switch(n)
		{
			case 1:
			{
				System.out.println("enter fn");
			}
			case 2:
			{
				System.out.println("enter ln");
			}
			case 3:
			{
				System.out.println("enter arcd");
			}
			case 4:
			{
				System.out.println("enter city");
			}
			case 5:
			{
				System.out.println("enter state");
			}
			default:
			{
				System.out.println("error");
				break;
			}
		}
		sval=br.readLine();


				c1.clr();																			//clr here


		while(in.available()!=0)
		{
			str=in.readLine();
			StringTokenizer st=new StringTokenizer(str," ");
			for(int i=0;i<8;i++)
			{
				arr[i]=st.nextToken();
			}

			if(sval==arr[n])
			{
				ctr++;
				for(int i=0;i<8;i++)
				{
					System.out.print(arr[i]+" ");
					System.out.println();
				}
			}
		}

		System.out.println("Total hits="+ctr);

	}
	public static void main(String args[])
		{
			search s=new search();

			try
			{
				s.calc();
			}

			catch(IOException e)
			{
				System.out.println("error");
			}
		}
}

Help will be highly appreciated.

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shubhang

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Nov 14th, 2008

-1

Re: Need help in code

What are the error messages? Post the whole stack.

peter_budo

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Code tags enforcer

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Nov 14th, 2008

Re: Need help in code

Please try running the program.
It is a part of my address book program.
The class searches records by first name,surname,area code,city and state.
The clear class just prints 100 blank lines to make it look as if the screen has cleared(I did not know of any other method).

shubhang

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Nov 14th, 2008

Re: Need help in code

You really should change

Java Syntax (Toggle Plain Text)
System.out.println("error");
System.out.println("error");

Java Syntax (Toggle Plain Text)
e.printStackTrace();
e.printStackTrace();

Ezzaral

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Posting Genius

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Nov 15th, 2008

Re: Need help in code

Sir , but what does this do? e.printStackTrace();
Was this the main problem in the code?

shubhang

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Nov 15th, 2008

Re: Need help in code

Sir,
I tried the

Java Syntax (Toggle Plain Text)
 e.printStackTrace();
 e.printStackTrace();

,instead of

Java Syntax (Toggle Plain Text)
System.out.println("error");
System.out.println("error");

But now I get a compile time error as follows:

C:\Documents and Settings\comp1\My Documents\search.java:49: cannot resolve symbol
symbol : variable e
location: class search
e.printStackTrace();

shubhang

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Nov 15th, 2008

Re: Need help in code

This is the modified code.
It is not working properly.
Please look into it.

Java Syntax (Toggle Plain Text)
import java.io.*;
import java.util.*;
class search
{
	private String str,sval;
	private String arr[]=new String[8];
	char ch1='y',ch2;
	private int n,ctr;
	clear c1=new clear();
	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 
	public void calc()throws IOException
	{
		DataInputStream in=new DataInputStream(new FileInputStream("adbk.txt"));			//file read
		System.out.println("How would you like to search?");
		System.out.println("1)by fn");
		System.out.println("2)by ln");
		System.out.println("3)by area code");
		System.out.println("4)by city");
		System.out.println("5)by state");
		System.out.println("enter choice:");
		n=Integer.parseInt(br.readLine());
																							//clr here
 
		switch(n)
		{
			case 1:
			{
				System.out.println("enter fn");
				break;
			}
			case 2:
			{
				System.out.println("enter ln");
				break;
			}
			case 3:
			{
				System.out.println("enter arcd");
				break;
			}
			case 4:
			{
				System.out.println("enter city");
				break;
			}
			case 5:
			{
				System.out.println("enter state");
				break;
			}
			default:
			{
				System.out.println("error");
				break;
			}
		}
		sval=br.readLine();
 
 
		while(in.available()!=0)
		{
			str=in.readLine();
			StringTokenizer st=new StringTokenizer(str," ");
			for(int i=0;i<8;i++)
			{
				arr[i]=st.nextToken();
			}
 
			if(sval==arr[n])
			{
				ctr++;
				for(int i=0;i<8;i++)
				{
					System.out.print(arr[i]+" ");
					System.out.println();
				}
			}
		}
 
		System.out.println("Total hits="+ctr);
 
	}
	public static void main(String args[])
		{
			search s=new search();
 
			try
			{
				s.calc();
			}
 
			catch(IOException e)
			{
				e.printStackTrace();
			}
		}
}
import java.io.*;
import java.util.*;
class search
{
	private String str,sval;
	private String arr[]=new String[8];
	char ch1='y',ch2;
	private int n,ctr;
	clear c1=new clear();
	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

	public void calc()throws IOException
	{
		DataInputStream in=new DataInputStream(new FileInputStream("adbk.txt"));			//file read
		System.out.println("How would you like to search?");
		System.out.println("1)by fn");
		System.out.println("2)by ln");
		System.out.println("3)by area code");
		System.out.println("4)by city");
		System.out.println("5)by state");
		System.out.println("enter choice:");
		n=Integer.parseInt(br.readLine());
																							//clr here

		switch(n)
		{
			case 1:
			{
				System.out.println("enter fn");
				break;
			}
			case 2:
			{
				System.out.println("enter ln");
				break;
			}
			case 3:
			{
				System.out.println("enter arcd");
				break;
			}
			case 4:
			{
				System.out.println("enter city");
				break;
			}
			case 5:
			{
				System.out.println("enter state");
				break;
			}
			default:
			{
				System.out.println("error");
				break;
			}
		}
		sval=br.readLine();
		
												
		while(in.available()!=0)
		{
			str=in.readLine();
			StringTokenizer st=new StringTokenizer(str," ");
			for(int i=0;i<8;i++)
			{
				arr[i]=st.nextToken();
			}

			if(sval==arr[n])
			{
				ctr++;
				for(int i=0;i<8;i++)
				{
					System.out.print(arr[i]+" ");
					System.out.println();
				}
			}
		}

		System.out.println("Total hits="+ctr);

	}
	public static void main(String args[])
		{
			search s=new search();

			try
			{
				s.calc();
			}

			catch(IOException e)
			{
				e.printStackTrace();
			}
		}
}

shubhang

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Nov 15th, 2008

Re: Need help in code

Click to Expand / Collapse Quote originally posted by shubhang ...

This is the modified code.
It is not working properly.
Please look into it.

That's really not enough information to go by. What specifically isn't working? I'm not seeing any compilation issues so whatever isn't working is most likely a logic error.

jasimp

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Nov 15th, 2008

Re: Need help in code

The error i get while runtime is as follows:

Java Syntax (Toggle Plain Text)
Exception in thread "main" java.util.NoSuchElementException
                                   at java.util.StringTokenizer.nextToken(StringTokenizer.java:232)
                                   at search.calc(search.java:70)
                                   at search.main(search.java:93)
Exception in thread "main" java.util.NoSuchElementException
                                   at java.util.StringTokenizer.nextToken(StringTokenizer.java:232)
                                   at search.calc(search.java:70)
                                   at search.main(search.java:93)

What does this indicate?

shubhang

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