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Thread: String Index Out of range

  1. #1
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    Default String Index Out of range

    Hii, this code is giving string index out of range exception

    import java.net.*;
    import java.io.*;
    import javax.swing.*;
    import java.util.Scanner;
    public class EraseClient{
    public static void main(String args[]){
    try {
    	String s = JOptionPane.showInputDialog("Enter the string message");
    	int len=s.length();
    	System.out.println("msg size is ="+len);
    	String block=JOptionPane.showInputDialog("enter the block size as a prime number");
    	int j,result;
    	boolean flag=false;	 
    	int b=Integer.parseInt(block);
     
    	while(flag==false)
    	{
    	     for (j=2; j< b ;j++ )
    		{
    	     result = b%j;
     
    	if(result==0)
    	{
    	flag=false;
    	break;
    	}
    	else{flag=true;}
     
    	  }
    	if (flag==false)
    	{
    	String str=JOptionPane.showInputDialog("Reenter the block size as a prime number between 1-100");
    		  b=Integer.parseInt(str);
     
     
    	    }
    	}
    	System.out.println("Block Size is=" +b);
    	int num=  (len/b);
    	String rep=JOptionPane.showInputDialog("enter the replication factor");
    	int r=Integer.parseInt(rep);
    	System.out.println(" replication factor is ="+ r);
    	int noOfBlocks;
    	if(len%b==0)
    		{		
    		noOfBlocks=len/b;
    		}
    	else
    		{
    		noOfBlocks=(len/b)+1;
    		int a=b-(len%b);
    		for(int i=0;i<a;i++)
    			{s=s+"*";}
    		}
    System.out.println("Message string after adding dummy bits");
    System.out.println(s);
    System.out.println("System will generate total number of blocks=" +noOfBlocks );
    int l=0;
    String[] s3 = new String[100];
    for(int i=1;i<=noOfBlocks;i++)
    		{
    System.out.println("block number"+ i +":"+s.substring(l,l+b));
    l=i*b;
    		}
    for(int k=1;k<=noOfBlocks;k++)
     
    		{
    	System.out.println("replication of block"+ k + ":");
    		int value=97;		
    	for(int i=1;i<=r;i++)
    		{
     
     
     
    		s3[k] = new String(s.substring(l,l+b));
    		String strk = Integer.toString(k);
    		String message= strk+ (char)value +" " +s3[k];
    			value=value+1;
    		System.out.println(message);
    		}
    		}
    }
     
    	catch(Exception e)
    	{
    		System.out.println(e);
    	}
    		}
    }


  2. #2
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    Default Re: String Index Out of range

    Could you show us the stack trace (error)? Also, what is the general purpose of this program? It seems a bit odd to just say "this doesn't work, fix it" without giving any other information.
    Simplicity calls for Complexity. Think about it.

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