错误：未报告的异常IllegalMoveException;必须被捕或被宣布被抛出

Question

不知道我做错了什么。如果我能得到一些很棒的帮助。这里是有错误的类：

import java.util.Scanner; 

/** The solitaire card game Idiot's Delight. */ 
public class IdiotsDelight { 

    /** For reading from the console. */ 
    public static final Scanner INPUT = new Scanner(System.in); 

    /** The four Stacks of Cards. */ 
    private Stack<Card>[] stacks; 

    /** The Deck of Cards. */ 
    private Deck deck; 

    /** Create and shuffle the Deck. Deal one Card to each Stack. */ 
    public IdiotsDelight() { 
     deck = new Deck(); 
     deck.shuffle(); 
     stacks = new Stack[4]; // This causes a compiler warning 
     for (int i = 0; i < 4; i++) { 
      stacks[i] = new ArrayStack<Card>(); 
     } 
     deal(); 
    } 

    /** Deal one Card from the Deck onto each Stack. */ 
    public void deal() { 
     for (Stack<Card> s : stacks) { 
      s.push(deck.deal()); 
     } 
    } 

    /** Play the game. */ 
    public void play() { 
     while (true) { 
     // Print game state 
      System.out.println("\n" + this); 
      // Check for victory 
      boolean done = true; 
      for (Stack<Card> s : stacks) { 
       if (!(s.isEmpty())) { 
        done = false; 
        break; 
       } 
      } 
      if (done) { 
       System.out.println("You win!"); 
       return; 
      } 
      // Get command 
      System.out.print("Your command (pair, suit, deal, or quit)? "); 
      String command = INPUT.nextLine(); 
      // Handle command 
      if (command.equals("pair")) { 
       removePair(); 
      } else if (command.equals("suit")) { 
       removeLowCard(); 
      } else if (command.equals("deal")) { 
       deal(); 
      } else { 
       return; 
      } 
     } 
    } 

    /** 
    * Remove the lower of two Cards of the same suit, as specified by 
    * the user. 
    */ 
    public void removeLowCard() throws IllegalMoveException { 
     System.out.print("Location (1-4) of low card? "); 
     int i = INPUT.nextInt(); 
     System.out.print("Location (1-4) of high card? "); 
     int j = INPUT.nextInt(); 
     INPUT.nextLine(); // To clear out input 
     stacks[i - 1].pop(); 
    } 

    /** 
    * Remove two Cards of the same rank, as specified by the user. 
    */ 
    public void removePair() throws IllegalMoveException { 
     System.out.print("Location (1-4) of first card? "); 
     int i = INPUT.nextInt(); 
     System.out.print("Location (1-4) of second card? "); 
     int j = INPUT.nextInt(); 
     INPUT.nextLine(); // To clear out input 
     stacks[i - 1].pop(); 
     stacks[j - 1].pop(); 
    } 

    public String toString() { 
     String result = ""; 
     for (int i = 0; i < 4; i++) { 
      if (stacks[i].isEmpty()) { 
       result += "-- "; 
      } else { 
       result += stacks[i].peek() + " "; 
      } 
     } 
     return result + "\n" + deck.size() + " cards left in the deck"; 
    } 

    /** Create and play the game. */  
    public static void main(String[] args) {  
     System.out.println("Welcome to Idiot's Delight."); 
     IdiotsDelight game = new IdiotsDelight(); 
     game.play(); 
    } 

} 

错误是在play（）方法，特别是在这两条线具有相同的错误：

removePair(); 

removeLowCard();  

IllgalMoveException类只是在需要它的情况下：

/** Thrown when a player attempts an illegal move in a game. */ 
public class IllegalMoveException extends Exception { 
} 

Answer 1

捕捉使用try-catch块的异常，例如：

//... 
try{ 
    removePair(); 
}catch(IllegalMoveException e){ 
    //... 
} 
//... 

//... 
try{ 
    removeLowCard();  
}catch(IllegalMoveException e){ 
    //... 
} 
//...