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scope of varibles & conversion

Posted on 2009-04-06
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Last Modified: 2012-05-06
Hi All,
I have a variable as shown below:
String curVal=request.getParameter("curVal");
// values are like -> only 4 (or)  only 4, 5 (or)  only  4,  5,  6
so now I want to store this values in array, so lets think values in "curVal -> 4,  5,  6"
 int items[] = new int[4];
 java.util.StringTokenizer st = null;
   if(curVal.length() > 0)
   {
      st = new java.util.StringTokenizer(curVal,",");
   }
        int j;
       for(j=0;j<4;j++)
       {
          while(st.hasMoreTokens())
             {
                  items[j]= Integer.parseInt(st.nextToken());
                  System.out.println("array :"+items[j]);
             }
       }
            // now I am expecting  4, 5,6,0 in array in the below statements, but I am getting 6,0,0,0 why?
            System.out.println("array 0:"+items[0]);
            System.out.println("array 1:"+items[1]);
            System.out.println("array 2:"+items[2]);
            System.out.println("array 3:"+items[3]);
%>

Thanks in advance.
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Question by:prk_usa
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4 Comments
 
LVL 12

Expert Comment

by:basav_com
ID: 24079354
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LVL 12

Expert Comment

by:basav_com
ID: 24079500
Here you messed up the code.

                   for(j=0;j<4;j++)
                   {
                      while(st.hasMoreTokens())
                         {
                              items[j]= Integer.parseInt(st.nextToken());
                              System.out.println("array :"+items[j]);
                         }
                   }
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LVL 12

Accepted Solution

by:
basav_com earned 500 total points
ID: 24079548
Take a look at this example:

output:
array :4
array :5
array :6
array 0:4
array 1:5
array 2:6
array 3:0
public class SampleStringTest {
	public static void main(String args[]){
		//String curVal=request.getParameter("curVal");
		String curVal = "4,5,6";
        //		 values are like -> only 4 (or)  only 4, 5 (or)  only  4,  5,  6
		//so now I want to store this values in array, so lets think values in "curVal -> 4,  5,  6"
		 int items[] = new int[4];
		 java.util.StringTokenizer st = null;
		   if(curVal.length() > 0)
		   {
		      st = new java.util.StringTokenizer(curVal,",");
		   }
		        int j=0;
 
		          while(st.hasMoreTokens())
		             {
		                  items[j]= Integer.parseInt(st.nextToken());
		                  System.out.println("array :"+items[j]);
		                  j++;
		             }
		
		            // now I am expecting  4, 5,6,0 in array in the below statements, but I am getting 6,0,0,0 why?
		            System.out.println("array 0:"+items[0]);
		            System.out.println("array 1:"+items[1]);
		            System.out.println("array 2:"+items[2]);
		            System.out.println("array 3:"+items[3]); 
	}
}

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LVL 12

Expert Comment

by:basav_com
ID: 24079601
Your code is messed up because you are looping again using the for loop.  You have alread used while(st.hasMoreTokens) to loop thru all the tokens and you actually stored everything in the
items[0] element only.
  while(st.hasMoreTokens())
                         {
                              items[j]= Integer.parseInt(st.nextToken());
                              System.out.println("array :"+items[j]);    ---------------> Print j also here. Then you will understand.
                                                     
                                              }

And then again looped the array again using for loop.


So look at my code, I simply removed the for loop and stored the elements in items[0] to items[2] using the while loop and by incrementing 'j' each time.

Ask me more if you don't understand the explanation :)
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