一个简单的ArrayList排序方法
一、首先定义一个排序规则:
class MyComparator implements Comparator<FoodInfo> {
public int compare(FoodInfo foodInfo1, FoodInfo foodInfo2) {
if (Integer.valueOf(foodInfo1.getFoodPrice()) > Integer
.valueOf(foodInfo2.getFoodPrice()))
return 1;
else if (Integer.valueOf(foodInfo1.getFoodPrice()) < Integer
.valueOf(foodInfo2.getFoodPrice()))
return -1;
else
return 0;
}
}
呵呵，关于Comparator这个类可以看下面的解释:
A Comparator is used to compare two objects to determine their ordering with respect to each other. On a given Collection, a Comparator can be used to obtain a sorted Collection which is totally ordered. For a Comparator to be consistent with equals, its {code #compare(Object, Object)} method has to return zero for each pair of elements (a,b) where a.equals(b) holds true. It is recommended that a Comparator implements Serializable.
二、然后实例化排序规则
MyComparator com=new MyComparator();
调用Collections.sort(matchFoodList,com);就可以对matchFoodList进行排序了
