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Java (
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| shubhang | Nov 19th, 2008 12:00 pm | |
| Need urgent help in code!
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 e.printstacktrace();
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");
}
}
} |
| Ezzaral | Nov 19th, 2008 4:28 pm | |
| Re: Need urgent help in code!
Quote:
Originally Posted by shubhang (Post 739709) Please have a look into the code.
| Why? Is there something wrong with it? If so, what specifically?
Quote:
Originally Posted by shubhang (Post 739709) Please also explain the function of 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. |
| shubhang | Nov 20th, 2008 1:27 pm | |
| 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.
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. |
| masijade | Nov 20th, 2008 2:17 pm | |
| Re: Need urgent help in code!
Define "does not work". |
| Antenka | Nov 20th, 2008 4:13 pm | |
| Re: Need urgent help in code!
It doesn't work because you compare strings using "==". Try this:
if(sval.equals(arr[pos])) |
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