我有一个ArrayList,我想对内容进行排序,以便先排序任何带有英文字母的内容,然后排序任何带有数字和非英文字符的内容。
例如:A,B,C ...... Z,1,2,3 ... 9,_test1,_2,......
目前我只知道如何按字母顺序对项目进行排序。建议?
class Comparator implements Comparator<Name> {
@Override
public int compare(Name name1, Name name2) {
return name1.getName().toLowerCase().compareTo(name2.getName().toLowerCase());
}
}
答案 0 :(得分:4)
您可以使用以下比较器实现:
Comparator<String> comparator = new Comparator<String>() {
@Override
public int compare(String lhs, String rhs) {
boolean lhsStartsWithLetter = Character.isLetter(lhs.charAt(0));
boolean rhsStartsWithLetter = Character.isLetter(rhs.charAt(0));
if ((lhsStartsWithLetter && rhsStartsWithLetter) || (!lhsStartsWithLetter && !rhsStartsWithLetter)) {
// they both start with letters or not-a-letters
return lhs.compareTo(lhs);
} else if (lhsStartsWithLetter) {
// the first string starts with letter and the second one is not
return -1;
} else {
// the second string starts with letter and the first one is not
return 1;
}
}
};