[英]Class cast Exception while using Comparable interface
當我嘗試執行以下代碼時,編譯器在第13行以“ java.lang.ClassCastException”引發錯誤。 有人可以讓我知道以下代碼有什么問題嗎?
package chapter11;
import java.util.*;
public class ComparableExample {
public static void main(String[] args) {
// TODO Auto-generated method stub
Item[] items = new Item[3];
items[0] = new Item(102, "Duct Tape");
items[1] = new Item(103, "Bailing Wire");
items[2] = new Item(104, "Chewing Gum");
Arrays.sort(items);
for (Item i : items) {
System.out.println(i.getNumber() + ":" + i.getDescription());
}
}
}
interface Comparable {
int compareTo(Object o);
}
class Item implements Comparable {
private int number;
private String description;
public Item(int number, String description) {
this.number = number;
this.description = description;
}
public int getNumber() {
return number;
}
public String getDescription() {
return description;
}
public int compareTo(Object o) {
Item i = (Item) o;
if (this.getNumber() < i.getNumber())
return -1;
if (this.getNumber() < i.getNumber())
return 1;
return 0;
}
}
任何幫助表示贊賞,謝謝!
刪除您的Comparable
接口,然后從Java api使用Comparable
接口。 而且,也許你可以改變
public int compareTo(Object o) {
Item i = (Item) o;
if (this.getNumber() < i.getNumber())
return -1;
if (this.getNumber() < i.getNumber())
return 1;
return 0;
}
進入:
public int compareTo(Object o) {
Item i = (Item) o;
if (this.getNumber() < i.getNumber())
return -1;
if (this.getNumber() > i.getNumber())
return 1;
return 0;
}
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