I created 3 classes for code below:

this is the first class:

public class StateListIMP {

public static void main(String[] args)

{

StateList sl=new StateList();

//LOAD FROMFILE

try

{

sl.LoadStateFile();

}

catch(Exception EXP12)

{

EXP12.printStackTrace();

}

//SEARCH FOR STATE INFO

sl.SearchState();

//PRINT STATE LIST

sl.printStateList();

}

}

the second class:

import java.io.*;

import java.lang.*;

import java.util.*;

class StateList

{

ListNode nodeHead;

// LinkedList constructor

public StateList()

{

nodeHead = null;

}

//LOAD STATE INFO FROMFILE

public void LoadStateFile()throws Exception

{

//BUFFEREDREADER TO READ FROMFILE

BufferedReader b=new BufferedReader(new FileReader("statedata.txt"));

String stateName;

//READ UNTIL THERES IS INFO

while((stateName=b.readLine())!=null)

{

String stateCapital=b.readLine();

int pop=Integer.parseInt(b.readLine());

ListNode t = new ListNode(stateName,stateCapital,pop);

ListNode crList = nodeHead;

if(nodeHead==null)

{

nodeHead=t;

}

else

{

t.setNextLink(nodeHead);

nodeHead=t;

}

}

b.close();//CLOSE BUFFEREDREADER

}

//SEARCH FOR THE GIVEN STATE

public void SearchState()

{

Scanner list_Scan12=new Scanner(System.in);

System.out.println("Enter state name tosearch:");

String stName= list_Scan12.nextLine();

ListNode crList = nodeHead;

while(crList != null)

{

if(crList.getStateName().equals(stName))

{

System.out.println("State Capital:"+crList.getStateCapital());

System.out.println("State Population:"+crList.getStatePopulation());

return;

}

else

crList = crList.getNextLink();

}

System.out.println("State is not found in list");

}

//PRINT STATES IN THE LINKEDLIST

public void printStateList()

{

ListNode crList = nodeHead;

System.out.println("STATE LIST");

while(crList != null)

{

System.out.println("State Name:"+crList.getStateName()+" Capital:"+crList.getStateCapital()+" Population:"+crList.getStatePopulation());

crList = crList.getNextLink();

}

}

}

the third class:

class ListNode { //VARIABLESFOR STATE NAME, CAPITAL POPULATION

ListNode nxtLink;

String name;

String capital;

int population;

public ListNode(String stName,String stCapital,int stPop)

{

name=stName;

capital=stCapital;

population=stPop;

nxtLink=null;

}

//CONSTRUCTOR

public ListNode(String stName,String stCapital,int stPop, ListNode _nxtLink)

{

nxtLink = _nxtLink;

name=stName;

capital=stCapital;

population=stPop;

}

//GET STATE NAME

public String getStateName()

{

return name;

}

public void setStateName(String stName)

{

name=stName;

}

//GET STATE CAPITAL

public String getStateCapital()

{

return capital;

}

public void setStateCapital(String stCapital)

{

capital=stCapital;

}

//GET STATE POPULATION

public int getStatePopulation()

{

return population;

}

public void setStatePopulation(int stPop)

{

population=stPop;

}

//GET NEXT NODE

public ListNode getNextLink()

{

return nxtLink;

}

//SET LINK

public void setNextLink(ListNode _nxtLink)

{

nxtLink = _nxtLink;

}

}

the resutl comed out like this:

run:

java.lang.NumberFormatException: For input string: ""

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)

at java.lang.Integer.parseInt(Integer.java:592)

at java.lang.Integer.parseInt(Integer.java:615)

at statelistimp.StateList.LoadStateFile(StateList.java:52)

at statelistimp.StateListIMP.main(StateListIMP.java:26)

Enter state name tosearch:

Alaska

State Capital:Juneau

State Population:738432

STATE LIST

State Name:Wyoming Capital:Cheyenne Population:586107

State Name:Wisconsin Capital:Madison Population:5771337

State Name:West Virginia Capital:Charleston Population:1844128

State Name:Washington Capital:Olympia Population:7170351

State Name:Virginia Capital:Richmond Population:8382993

State Name:Vermont Capital:Montpelier Population:626042

State Name:Utah Capital:Salt Lake City Population:2995919

State Name:Texas Capital:Austin Population:27469114

State Name:Tennessee Capital:Nashville Population:6600299

State Name:South Dakota Capital:Pierre Population:858469

State Name:South Carolina Capital:Columbia Population:4896146

State Name:Rhode Island Capital:Providence Population:1056298

State Name:Pennsylvania Capital:Harrisburg Population:12802503

State Name:Oregon Capital:Salem Population:4028977

State Name:Oklahoma Capital:Oklahoma City Population:3911338

State Name:Ohio Capital:Columbus Population:11613423

State Name:North Dakota Capital:Bismarck Population:756927

State Name:North Carolina Capital:Raleigh Population:10042802

State Name:New York Capital:Albany Population:19795791

State Name:New Mexico Capital:Santa Fe Population:2085109

State Name:New Jersey Capital:Trenton Population:8958013

State Name:New Hampshire Capital:Concord Population:1330608

State Name:Nevada Capital:Carson City Population:2890845

State Name:Nebraska Capital:Lincoln Population:1896190

State Name:Montana Capital:Helena Population:1032949

State Name:Missouri Capital:Jefferson City Population:6083672

State Name:Mississippi Capital:Jackson Population:2992333

State Name:Minnesota Capital:Saint Paul Population:5489594

State Name:Michigan Capital:Lansing Population:9922576

State Name:Massachusetts Capital:Boston Population:6794422

State Name:Maryland Capital:Annapolis Population:6006401

State Name:Maine Capital:Augusta Population:1329328

State Name:Louisiana Capital:Baton Rouge Population:4670724

State Name:Kentucky Capital:Frankfort Population:4425092

State Name:Kansas Capital:Topeka Population:2911641

State Name:Iowa Capital:Des Moines Population:3123899

State Name:Indiana Capital:Indianapolis Population:6619680

State Name:Illinois Capital:Springfield Population:12859995

State Name:Idaho Capital:Boise Population:1654930

State Name:Hawaii Capital:Honolulu Population:1431603

State Name:Georgia Capital:Atlanta Population:10214860

State Name:Florida Capital:Tallahassee Population:20271272

State Name:Delaware Capital:Dover Population:945934

State Name:Connecticut Capital:Hartford Population:3590886

State Name:Colorado Capital:Denver Population:5456574

State Name:California Capital:Sacramento Population:39144818

State Name:Arkansas Capital:Little Rock Population:2978204

State Name:Arizona Capital:Phoenix Population:6828065

State Name:Alaska Capital:Juneau Population:738432

what is the problem?