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Nov 19th, 2008

Need urgent help in code!

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Hi,
I am new at java.
I have made the search class of an address book program
with the functions of add, modify and delete.

Please have a look into the code.

Please also explain the function of

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

Java Syntax (Toggle Plain Text)
import java.io.*;
import java.util.*;
class search
{
	private String str,sval;
	private String arr[]=new String[8];
	private int ch;
	private int pos,ctr;
	clear c1=new clear();
	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 
	public void calc()throws IOException
	{
 
                DataInputStream in=DataInputStream(new FileInputStream("adbk.txt"));
		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:");
		ch=Integer.parseInt(br.readLine());
 
 
		switch(ch)
		{
			case 1:
			{
				System.out.println("enter fn");
				pos=0;
				break;
			}
			case 2:
			{
				System.out.println("enter ln");
				pos=2;
				break;
			}
			case 3:
			{
				System.out.println("enter arcd");
				pos=3;
				break;
			}
			case 4:
			{
				System.out.println("enter city");
				pos=5;
				break;
			}
			case 5:
			{
				System.out.println("enter state");
				pos=6;
				break;
			}
			default:
			{
				System.out.println("error");
				break;
			}
		}
		sval=br.readLine();
 
 
																					//clr here
		while((str=in.readLine())!=null)
		{
 
			StringTokenizer st=new StringTokenizer(str,"_");
			for(int i=0;i<=7;i++)
			{
				arr[i]=st.nextToken();
			}
 
			if(sval==arr[pos])
			{
				ctr++;
				for(int i=0;i<=7;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];
	private int ch;
	private int pos,ctr;
	clear c1=new clear();
	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

	public void calc()throws IOException
	{
			
                DataInputStream in=DataInputStream(new FileInputStream("adbk.txt"));
		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:");
		ch=Integer.parseInt(br.readLine());
																							

		switch(ch)
		{
			case 1:
			{
				System.out.println("enter fn");
				pos=0;
				break;
			}
			case 2:
			{
				System.out.println("enter ln");
				pos=2;
				break;
			}
			case 3:
			{
				System.out.println("enter arcd");
				pos=3;
				break;
			}
			case 4:
			{
				System.out.println("enter city");
				pos=5;
				break;
			}
			case 5:
			{
				System.out.println("enter state");
				pos=6;
				break;
			}
			default:
			{
				System.out.println("error");
				break;
			}
		}
		sval=br.readLine();


																					//clr here
		while((str=in.readLine())!=null)
		{

			StringTokenizer st=new StringTokenizer(str,"_");
			for(int i=0;i<=7;i++)
			{
				arr[i]=st.nextToken();
			}

			if(sval==arr[pos])
			{
				ctr++;
				for(int i=0;i<=7;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");
			}
		}
}

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shubhang

Reputation Points: 10

Solved Threads: 0

Light Poster

Offline

25 posts
since Oct 2008

Permalink

Nov 19th, 2008

Re: Need urgent help in code!

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

Please have a look into the code.

Why? Is there something wrong with it? If so, what specifically?

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

Please also explain the function of
Java Syntax (Toggle Plain Text)
 e.printstacktrace();
e.printstacktrace();

There is no such function as you have written it. There is, however, a printStackTrace() method on Throwable. Read that API link to see what it does.

Ezzaral

Moderator

Featured Poster

Reputation Points: 3239

Solved Threads: 838

Posting Genius

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6,756 posts
since May 2007

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Nov 20th, 2008

Re: Need urgent help in code!

When I run the program,the search part(HIGHLIGHTED) does not work.
Please tell me where I am going wrong.

(Toggle Plain Text)

import java.io.*;
import java.util.*;
class search
{
	private String str,sval;
	private String arr[]=new String[8];
	private int ch;
	private int pos,ctr;

	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

	public void calc()throws IOException
	{
		BufferedReader in=new BufferedReader(new FileReader("adbk.txt"));			//file read
		//DataInputStream in=DataInputStream(new FileInputStream("adbk.txt"));
		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:");
		ch=Integer.parseInt(br.readLine());
																							

		switch(ch)
		{
			case 1:
			{
				System.out.println("enter fn");
				pos=0;
				break;
			}
			case 2:
			{
				System.out.println("enter ln");
				pos=2;
				break;
			}
			case 3:
			{
				System.out.println("enter arcd");
				pos=3;
				break;
			}
			case 4:
			{
				System.out.println("enter city");
				pos=5;
				break;
			}
			case 5:
			{
				System.out.println("enter state");
				pos=6;
				break;
			}
			default:
			{
				System.out.println("error");
				break;
			}
		}
		sval=br.readLine();
																							//clr here
		while((str=in.readLine())!=null)
		{

			StringTokenizer st=new StringTokenizer(str,"_");
			for(int i=0;i<=7;i++)
			{
				arr[i]=st.nextToken();


			}
			System.out.println();

			if(sval==arr[pos])
			{
				ctr++;
				for(int i=0;i<=7;i++)
				{
					System.out.print(arr[i]+" ");
				}
				System.out.println("");
			}

		}

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

	}

}

Thanks.

shubhang

Reputation Points: 10

Solved Threads: 0

Light Poster

Offline

25 posts
since Oct 2008

Permalink

Nov 20th, 2008

Re: Need urgent help in code!

Define "does not work".

masijade

Moderator

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Solved Threads: 490

Industrious Poster

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4,043 posts
since Feb 2006

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Nov 20th, 2008

Re: Need urgent help in code!

It doesn't work because you compare strings using "==". Try this:

java Syntax (Toggle Plain Text)
if(sval.equals(arr[pos]))
if(sval.equals(arr[pos]))

Antenka

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Solved Threads: 82

Posting Whiz

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361 posts
since Nov 2008

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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