错误：“线程“main”中出现异常” java.lang.ClassCastException: Manycard.Main$Card 无法转换为 java.lang.Comparable”
嘿大家。我正在尝试使用 Array.sort 方法对整数数组进行排序，但不断收到上述错误。我已经查找了正在使用的此方法的示例，并且我使用相同的语法。因为我确信这是必要的，所以这是我正在使用的代码：
public class Card
{
int suit, rank;
public Card () {
this.suit = 0; this.rank = 0;
}
public Card (int suit, int rank) {
this.suit = suit; this.rank = rank;
}
}
class Deck {
Card[] cards;
public Deck (int n) {
cards = new Card[n];
}
public Deck () {
cards = new Card[52];
int index = 0;
for (int suit = 0; suit <= 3; suit++) {
for (int rank = 1; rank <= 13; rank++) {
cards[index] = new Card (suit, rank);
index++;
}
}
}
public int median (Deck deck) {
Arrays.sort(deck.cards);
return deck.cards[2].rank;
}
Hey all. I'm trying to sort an array of integers using the Array.sort method, and I keep getting the above error. I've looked up examples of this method in use, and I'm using the same syntax. Because I'm sure it will be necessary, here's the bit of code I'm using:
public class Card
{
int suit, rank;
public Card () {
this.suit = 0; this.rank = 0;
}
public Card (int suit, int rank) {
this.suit = suit; this.rank = rank;
}
}
class Deck {
Card[] cards;
public Deck (int n) {
cards = new Card[n];
}
public Deck () {
cards = new Card[52];
int index = 0;
for (int suit = 0; suit <= 3; suit++) {
for (int rank = 1; rank <= 13; rank++) {
cards[index] = new Card (suit, rank);
index++;
}
}
}
public int median (Deck deck) {
Arrays.sort(deck.cards);
return deck.cards[2].rank;
}
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您的
Card类需要实现Comparable。这是必需的，以便Arrays.sort方法可以调用您将在Card中实现的compareTo(Card card)方法并进行排序基于其返回值。来自文档 ,
compareTo执行以下操作：Your
Cardclass needs to implementComparable<Card>. This is needed so that theArrays.sortmethod can call thecompareTo(Card card)method that you will implement inCardand do the sorting based on its return value.From the documentation,
compareTodoes the following:Card需要实现Comparable接口，特别是compareTo方法。
Card needs to implement the Comparable interface, specifically the compareTo method.
您在
deck.cards上调用Arrays.sort，它是一个Card 对象数组，而不是一个整数数组。您的 Card 类需要实现可比性。You call
Arrays.sortondeck.cardsthat is an array of Card objects, not an array of integers. Your Card class needs to implement comparable.为了使用 Arrays.sort(Object[] o)，要排序的对象必须实现 Compareable 接口。
In order to use Arrays.sort(Object[] o), the object you're sorting must implement the Compareable interface.