我尝试在我的代码中处理多个异常，同时使用扫描程序让用户输入新路径（如果当前的路径不正确），但我一直收到相同的错误，＆＃34; No Line实测值＆＃34 ;.任何帮助，将不胜感激。问题发生在＆＃34; path = sc.nextLine（）＆＃34;的catch块中。
public class Deck {
private static ArrayList<Card> monsters = new ArrayList<Card>();
private static ArrayList<Card> spells = new ArrayList<Card>();
private ArrayList<Card> deck = new ArrayList<Card>();
private static String monstersPath = "Database-Monster.csv";
private static String spellsPath = "Database-Spells.csv";
// private static Board board;
public Deck() throws IOException, UnknownCardTypeException,
UnknownSpellCardException, MissingFieldException,
EmptyFieldException {
if (monsters== null) {
monsters = loadCardsFromFile(monstersPath);
}
if (spells == null) {
spells = loadCardsFromFile(spellsPath);
}
// shuffleDeck();
buildDeck(monsters, spells);
shuffleDeck();
}
/*
* public static Board getBoard() { return board; }
*
* public static void setBoard(Board board) { Deck.board = board; }
*/
public ArrayList<Card> loadCardsFromFile(String path) throws IOException,
UnknownCardTypeException, UnknownSpellCardException,
MissingFieldException, EmptyFieldException {
Scanner sc = new Scanner(System.in);
int trials = 3;
String currentLine = null;
//String newPath = "";
for (int i = 0; i <=trials ; i++) {
try {
FileReader fileReader = new FileReader(path);
BufferedReader br = new BufferedReader(fileReader);
ArrayList<Card> temp = new ArrayList<Card>();
int sourceLineNumber = 1; // Source line
while ((currentLine = br.readLine()) != null) {
String[] mOrS = new String[6]; // Monsters or Spells
mOrS = currentLine.split(",");
int sourceFieldNumber = 0;
while (sourceFieldNumber < mOrS.length) {
if (mOrS[sourceFieldNumber].equals("")
|| mOrS[sourceFieldNumber].equals(" ")) {
throw new EmptyFieldException(path,
sourceLineNumber, sourceFieldNumber + 1); // Depends
// on
// the
// Splitted
// String
// array,
// loop
// on
// every
// field
// and
// check
}
sourceFieldNumber++;
}
if (mOrS[0].equals("Monster")) {
if (mOrS.length == 6) {
int attack = (int) (Integer.parseInt(mOrS[3]));
int defense = (int) (Integer.parseInt(mOrS[4]));
int level = (int) (Integer.parseInt(mOrS[5]));
MonsterCard monster = new MonsterCard(mOrS[1],
mOrS[2], level, attack, defense);
temp.add(monster);
} else {
throw new MissingFieldException(path,
sourceLineNumber); // Depends on the amount
// of fields in the
// String array, Monster
// should have 6, Type
// and 5 attributes.
}
} else if (mOrS[0].equals("Spell")) {
if (mOrS.length != 3) {
throw new MissingFieldException(path,
sourceLineNumber); // Depends on the amount
// of fields in the
// String Array, Spells
// should have 3, Type
// and 2 attributes
}
if (mOrS[1].equals("Card Destruction")) {
CardDestruction cardDestruction = new CardDestruction(
mOrS[1], mOrS[2]);
temp.add(cardDestruction);
} else if (mOrS[1].equals("Change Of Heart")) {
ChangeOfHeart changeOfHeart = new ChangeOfHeart(
mOrS[1], mOrS[2]);
temp.add(changeOfHeart);
} else if (mOrS[1].equals("Dark Hole")) {
DarkHole darkHole = new DarkHole(mOrS[1], mOrS[2]);
temp.add(darkHole);
} else if (mOrS[1].equals("Graceful Dice")) {
GracefulDice gracefulDice = new GracefulDice(
mOrS[1], mOrS[2]);
temp.add(gracefulDice);
} else if (mOrS[1].equals("Harpie's Feather Duster")) {
HarpieFeatherDuster harpieFeatherDuster = new HarpieFeatherDuster(
mOrS[1], mOrS[2]);
temp.add(harpieFeatherDuster);
} else if (mOrS[1].equals("Heavy Storm")) {
HeavyStorm heavyStorm = new HeavyStorm(mOrS[1],
mOrS[2]);
temp.add(heavyStorm);
} else if (mOrS[1].equals("Mage Power")) {
MagePower magePower = new MagePower(mOrS[1],
mOrS[2]);
temp.add(magePower);
} else if (mOrS[1].equals("Monster Reborn")) {
MonsterReborn monsterReborn = new MonsterReborn(
mOrS[1], mOrS[2]);
temp.add(monsterReborn);
} else if (mOrS[1].equals("Pot of Greed")) {
PotOfGreed potOfGreed = new PotOfGreed(mOrS[1],
mOrS[2]);
temp.add(potOfGreed);
} else if (mOrS[1].equals("Raigeki")) {
Raigeki raigeki = new Raigeki(mOrS[1], mOrS[2]);
temp.add(raigeki);
} else {
throw new UnknownSpellCardException(path,
sourceLineNumber, mOrS[1]); // We have 10
// spells, if
// there is an
// unknown one
// we throw the
// exception
}
} // else of Spell code
else {
throw new UnknownCardTypeException(path,
sourceLineNumber, mOrS[0]); // We have two
// types, Monster
// and Spell.
}
sourceLineNumber++;
}// While loop close
br.close();
return temp;
}// try Close
catch (FileNotFoundException exception) {
if (i == 3) {
throw exception;
}
System.out
.println("The file was not found, Please enter a correct path:");
path = sc.nextLine();
//path = newPath;
} catch (MissingFieldException exception) {
if (i == 3) {
throw exception;
}
System.out.print("The file path: " + exception.getSourceFile()
+ "At Line" + exception.getSourceLine()
+ "Contians a missing Field");
System.out.print("Enter New Path");
path = sc.nextLine();
//path = newPath;
} catch (EmptyFieldException exception) {
if (i == 3) {
throw exception;
}
System.out.println("The file path" + exception.getSourceFile()
+ "At Line" + exception.getSourceLine() + "At field"
+ exception.getSourceField()
+ "Contains an Empty Field");
System.out.println("Enter New Path");
path = sc.nextLine();
//path = newPath;
} catch (UnknownCardTypeException exception) {
if (i == 3) {
throw exception;
}
System.out.println("The file path:" + exception.getSourceFile()
+ "At Line" + exception.getSourceLine()
+ "Contains an Unknown Type"
+ exception.getUnknownType());
System.out.println("Enter New Path");
path = sc.nextLine();
//path = newPath;
} catch (UnknownSpellCardException exception) {
if (i == 3) {
throw exception;
}
System.out.println("The file Path" + exception.getSourceFile()
+ "At Line" + exception.getSourceLine()
+ "Contains an Unknown Spell"
+ exception.getUnknownSpell());
System.out.println("Enter New Path");
path = sc.nextLine();
//path = newPath;
}
} // For loop close
ArrayList<Card> noHope = null;
return noHope;
}// Method Close
答案 0 :(得分：0)
在分配hasNext()
path = sc.nextLine();
类似的东西： -
if (sc.hasNext()){
path = sc.nextLine();
}
else{
//print something else.
}
public String next（）查找并返回下一个完整标记 这个扫描仪。之前是一个完整的标记，然后是输入 匹配分隔符模式。此方法可能会在等待时阻止 输入到扫描，即使先前调用hasNext（）返回 真正。指定者：接口Iterator中的next返回： next token抛出：NoSuchElementException - 如果没有更多的令牌 available IllegalStateException - 如果此扫描程序已关闭参见： 迭代器