比如定义一个类,在类中重新定义Collection.sort()排序规则:
class ComparatorDp implements Comparator{
public int compare(Object obj1, Object obj2) {
double temp=obj1.value()-obj2.value();
int a =
0;
if (temp>
0) {
a = -
1;
}
else {
a =
1;
}
return a;
}
}
降序排列:obj1-obj2>0的话返回-1,说明按照从大到小排序 升序排列:obj1-obj2>0的话返回1,说明按照从小到大排序
class ComparatorDp Comparator{
public int compare(Object obj1, Object obj2) {
return obj1.
value()-obj2.
value();
return -(obj1.
value()-obj2.
value());
}
}
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