List<User> list = new ArrayList<User>(); Arrays.sort(list, new Comparator() { public int compare(Object o1, Object o2) { User f1 = (User)o1; User f2 = (User)o2; if (f1.getPercent() < f2.getPercent()) return -1; if (f1.getPercent() > f2.getPercent()) return 1; return 0 ; } } );先转一下percent字段类型就OK了
public class ScoreComparator implements Comparator { @Override public int compare(Object arg0, Object arg1) { // TODO Auto-generated method stub Student s1 = (Student) arg0; Student s2 = (Student) arg1; if(s1.score > s2.score){//第一个比第二个大,返回-1 return -1; }else if(s1.score == s2.score){//第一个和第二个相等,返回0 return 0; }else{//第一个比第二个小,返回1 return 1; } } }//以下调用 //.... ScoreComparator sc = new ScoreComparator(); Collections.sort(list, sc); //....
List<User> list = new ArrayList<User>();
Arrays.sort(list, new Comparator()
{
public int compare(Object o1, Object o2)
{
User f1 = (User)o1;
User f2 = (User)o2; if (f1.getPercent() < f2.getPercent()) return -1;
if (f1.getPercent() > f2.getPercent()) return 1;
return 0 ;
}
}
);先转一下percent字段类型就OK了
public class ScoreComparator implements Comparator {
@Override
public int compare(Object arg0, Object arg1) {
// TODO Auto-generated method stub
Student s1 = (Student) arg0;
Student s2 = (Student) arg1;
if(s1.score > s2.score){//第一个比第二个大,返回-1
return -1;
}else if(s1.score == s2.score){//第一个和第二个相等,返回0
return 0;
}else{//第一个比第二个小,返回1
return 1;
}
}
}//以下调用
//....
ScoreComparator sc = new ScoreComparator();
Collections.sort(list, sc);
//....