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我正在研究一个简单的linkedList类，这个类的要求之一是使用recurs来实现contains方法、add方法和remove方法。

根据示例，我发现我已经实现了 remove 方法，但是 contains 一直为我抛出错误。

任何人都可以帮助指出我的包含方法有什么问题，谢谢和问候。

public class RecursiveLinkedList {

private int value;
private RecursiveLinkedList next;

/*
 * Default Constructor
 * 
 * @param value an absolute int value for the current Node
 * @param next an absolute RecursiveLinkedList value for the current Node
 */
public RecursiveLinkedList(int value, RecursiveLinkedList next) {
    this.value = value;
    this.next = next;
}

/*
 * Constructor Empty, when user supplies an empty for the construcot use 
 * value = - 1 and next = null as input parameters
 * 
 * @param value an absolute int value for the current Node
 * @param next an absolute RecursiveLinkedList value for the current Node
 */
public static final RecursiveLinkedList EMPTY = new RecursiveLinkedList(-1, null) 
{
    public RecursiveLinkedList remove(int n) { return this; };

    public String toString() { return ""; };
};

public RecursiveLinkedList remove(int n) {
    if (value == n){
        return next;
    }
    //Call the remove method of the next Node if the selected Node is not the current node
    return new RecursiveLinkedList(value, next.remove(n));
}

public boolean contains(int n) {
    if (value == n){
        return true;
    }else if(next == null){
        return false;
    }
    return new RecursiveLinkedList(value, next).contains(n);
} 

public String toString() {
    return value + "," + next.toString();
}

public static void main(String[] args) {
    RecursiveLinkedList l = new RecursiveLinkedList(1,
                    new RecursiveLinkedList(2, 
                    new RecursiveLinkedList(2,
                    new RecursiveLinkedList(3, 
                    new RecursiveLinkedList(4, EMPTY)))));
    System.out.println(" Test to String Method : " + l.toString());
    System.out.println(" Test remove method " + l.remove(1).toString());
    System.out.println(" Test contains method " + String.valueOf(l.contains(4)));
}

}

4

1 回答 1

0

为了防止StackOverflowError你应该改用：

public boolean contains(int n) {
    if (value == n){
        return true;
    }else if(next == null){
        return false;
    }
    return next.contains(n);
}
于 2013-04-07T00:06:46.483 回答