标明这种有限自动机的初始状态 [英] Marking the Initial State of this Finite Automaton
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问题描述
我正在研究基于这个。
从此代码：
public void markInitialState (int initialStateId) {
State theInitialState = allStates.get(initialStateId);
theInitialState.isInitial=true;
allStates.add(initialStateId, theInitialState);
/*DEBUG*/
System.out.println(" THE INITIAL STATE ID IS " + initialStateId);
theInitialState = allStates.get(initialStateId);
if ((theInitialState.isInitial)==true)
System.out.println("THE STATE " + theInitialState + " IS MARKED AS INITIAL");
}
我得到的是：
THE STATE {d=(this Map), e=(this Map), a=(this Map)} IS MARKED AS INITIAL
应该说：
THE STATE 2 IS MARKED AS INITIAL
为什么地图这样做？
我不明白为什么正确使用相同的aproach标记最终状态。
I don't get why it's marking the final states correctly using the same aproach.
输入文件是：
4
3 2 1
ab
1 0
2 0
2 0
2
0 3
abaa
aab
aba
3 3 2
ade
0 1 2
1 2 0
2 1 0
1 2
2 2
a
de
3 2 1
ab
1 0
2 0
2 0
2
0 3
abaa
aab
aba
3 3 2
ade
0 1 2
1 2 0
2 1 0
1 2
2 2
a
de
代码：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package afd;
import java.io.*;
import java.util.*;
/**
*
* @author Administrator
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws IOException {
// TODO code application logic here
FileReader fr = new FileReader("E://Documents and Settings//Administrator//My Documents//NetBeansProjects//AFD//src//afd//dfa.in");
BufferedReader br = new BufferedReader(fr);
String firstLine= br.readLine();
String [] firstLineSplitted = firstLine.split(" ");
/*debug*/
System.out.println("firstLine is " + firstLine);
int numberOfTestCases = Integer.parseInt(firstLine);
for (int indexOfTestCases =0; indexOfTestCases < numberOfTestCases; indexOfTestCases++ ){
String caseStartLine = br.readLine();
/*debug*/
System.out.println("caseStarLine is " + caseStartLine);
String [] caseStartLineSplitted = caseStartLine.split(" ");
int numberOfStates;
int numberOfAlphabetSymbols;
int numberOfFinalStates;
numberOfStates = Integer.parseInt(caseStartLineSplitted[0]);
numberOfAlphabetSymbols = Integer.parseInt(caseStartLineSplitted[1]);
numberOfFinalStates = Integer.parseInt(caseStartLineSplitted[2]);
Automaton automaton = new Automaton();
automaton.setAllStates(numberOfStates);
// automaton.size = numberOfStates;
// automaton.numberOfAlphabetSymbols = numberOfAlphabetSymbols;
// automaton.numberOfFinalStates = numberOfFinalStates;
//Automaton a = new Automaton(numberOfStates);
String alphabetLine = br.readLine();
System.out.println("alphabetLine is " + alphabetLine);
automaton.setAlphabet (alphabetLine);
// automaton.alphabetSymbols =new StringBuffer(alphabetLine);
for (int indexOfStates = 0; indexOfStates < numberOfStates; indexOfStates++){
String transitionsLine = br.readLine();
/*debug*/
System.out.println("transitionsLine is " + transitionsLine);
automaton.setTransitions(indexOfStates,transitionsLine);
/*String [] ijLineSplitted = ijLine.split(" ");
int i = Integer.parseInt(ijLineSplitted[0]);
int j = Integer.parseInt(ijLineSplitted[1]);
*/
}
String finalStatesLine = br.readLine();
/*debug*/
System.out.println("finalStatesLine is " + finalStatesLine);
String finalStatesLineSplitted [] = finalStatesLine.split(" ");
automaton.markFinalStates(finalStatesLineSplitted);
String initialStateAndNumberOfStringsLine = br.readLine();
/*debug*/
System.out.println("initialStateAndNumberOfStringsLine is " +initialStateAndNumberOfStringsLine);
String [] splittedInitialStateLine = initialStateAndNumberOfStringsLine.split(" ");
int initialState = Integer.parseInt(splittedInitialStateLine[0]);
int numberOfStrings = Integer.parseInt(splittedInitialStateLine[1]);
automaton.markInitialState(initialState);
for (int stringIndex =0; stringIndex<numberOfStrings; stringIndex++){
String stringToProcess = br.readLine();
/*debug*/
System.out.println("stringToProcess is " + stringToProcess);
}
}
}
}
class State extends HashMap<Character, State>{
boolean isFinal;
boolean isInitial;
State () {
isInitial=false;
isFinal = false;
}
}
class Automaton{
List <State> allStates;
//private List<State> finalStates;
State initialState;
State currentState;
char [] alphabet;
Automaton() {
allStates = new ArrayList<State>();
}
public void setAllStates (int numberOfStates) {
for (int i =0; i <numberOfStates; i++) {
State newState = new State();
allStates.add(newState);
}
}
public void setAlphabet (String alphabetLine){
alphabet = alphabetLine.toCharArray();
}
public void markFinalStates (String [] finalStates){
for (int index =0; index<finalStates.length; index++) {
int aFinalStateId = Integer.parseInt(finalStates[index]);
State aFinalState = allStates.get(aFinalStateId);
aFinalState.isFinal = true;
allStates.add(aFinalStateId, aFinalState);
/*DEBUG*/
aFinalState = allStates.get(aFinalStateId);
if ((aFinalState.isFinal)==true)
System.out.println("THE STATE " + aFinalStateId + " IS MARKED AS FINAL");
}
}
public void markInitialState (int initialStateId) {
State theInitialState = allStates.get(initialStateId);
theInitialState.isInitial=true;
allStates.add(initialStateId, theInitialState);
/*DEBUG*/
System.out.println(" THE INITIAL STATE ID IS " + initialStateId);
theInitialState = allStates.get(initialStateId);
if ((theInitialState.isInitial)==true)
System.out.println("THE STATE " + theInitialState + " IS MARKED AS INITIAL");
}
public void setTransitions(int stateId, String transitionsLine){
State theOneToChange = allStates.get(stateId);
String [] statesToReachStringSplitted = transitionsLine.split(" ");
for (int symbolIndex=0; symbolIndex<statesToReachStringSplitted.length;symbolIndex++){
int reachedState= Integer.parseInt(statesToReachStringSplitted[symbolIndex]);
theOneToChange.put(alphabet[symbolIndex],allStates.get(reachedState));
System.out.println("THE STATE " + stateId + " REACHES THE STATE " + reachedState + " WITH THE SYMBOL " + alphabet[symbolIndex]);
}
allStates.add(stateId, theOneToChange);
}
public boolean processString (String string)
{
boolean accepted = false;
return accepted;
}
}
推荐答案
public void markInitialState (int initialStateId) {
State theInitialState = allStates.get(initialStateId);
theInitialState.isInitial=true;
allStates.add(initialStateId, theInitialState);
/*DEBUG*/
System.out.println(" THE INITIAL STATE ID IS " + initialStateId);
theInitialState = allStates.get(initialStateId);
if ((theInitialState.isInitial)==true)
System.out.println("THE STATE " + theInitialState + " IS MARKED AS INITIAL");
}
在此方法的最后一行，您正在打印 theInitialState 而不是 initialStateID 。
On the last line of this method, you're printing theInitialState instead of initialStateID.
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