比较器不会与Arrays.sort一起使用 [英] Comparator won't work with Arrays.sort
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问题描述
所以我正在研究一个比较器问题,但我不知道为什么第一堂课中的 Array.sort
会给我以下错误:
So I'm working on a comparator problem and I can't figure out why the Array.sort
in this first class is giving me the error of:
Arrays类型的sort(T [],Comparator)方法不适用于参数(ArrayList,CalorieComparator)
The method sort(T[], Comparator) in the type Arrays is not applicable for the arguments (ArrayList, CalorieComparator)
餐厅等级:
import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;
public class Restaurant {
private ArrayList<Edible> elist;
public Restaurant() {
}
public void addEdibleItem(Edible item){
elist.add(item);
}
public List<Edible> orderByCalories(){
Arrays.sort(elist, new CalorieComparator());
}
CalorieComparator类:
CalorieComparator class:
import java.util.Comparator;
public class CalorieComparator implements Comparator {
public int compare(Object o1, Object o2){
Edible thisfood = (Edible)o1;
Edible otherfood = (Edible)o2;
if(thisfood.getCalories() > otherfood.getCalories())
return 1;
else if (thisfood.getCalories() < otherfood.getCalories())
return -1;
else
return 0;
}
}
推荐答案
ArrayList
与Java数组不同.由于您使用的是列表,因此 Arrays.sort
在这里无济于事.
An ArrayList
is different from a Java array; since you're using a List, Arrays.sort
won't help you here.
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