The code below have some logic error. Here is the code import java.io.File; impo

ID: 3756018 • Letter: T

Question

The code below have some logic error.

Here is the code

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
class Validator
{
public static void main(String args[]) throws IOException
{

Scanner scanner = new Scanner(new File(args[0]));

Map<StateTransition, Integer> stateTransitions = new HashMap<StateTransition, Integer>();

while(scanner.hasNextLine())
{
stateTransitions.put(new StateTransition(scanner.nextInt(), scanner.next().toCharArray()[0]), scanner.nextInt());
}

scanner = new Scanner(new File(args[1]));
String inputString = scanner.next();
scanner.close();

Integer currentState = 0;
int i=0;
System.out.println("Testing with input string : " + inputString);

for(i=0; i<inputString.length(); i++)
{
currentState = stateTransitions.get(new StateTransition(currentState, inputString.charAt(i)));

if(currentState == null)
{
System.out.println("Failure at position " + i + " found character " + inputString.charAt(i));
break;
}

else if(currentState == 999)
{
System.out.println("Success");
break;
}
}

if(i == inputString.length())
{
System.out.println("Input string ended before success transition");
}
}
}

> run Validator

java.lang.ArrayIndexOutOfBoundsException: 0

at Validator.main(Validator.java:12)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:267)

> run Validator statemachine.txt 112.txt

Testing with input string : aCb

Failure at position 1 found character C

112.txt has more than one line content. However this code only read and deal with first line. There should be some problem with the loop.

Explanation / Answer

mport java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
class Validator
{
public static void main(String args[]) throws IOException
{