尝试使用此比较器,该比较器将删除所有非数字字符,然后将其余字符与数字进行比较:
Collections.sort(strings, new Comparator<String>() { public int compare(String o1, String o2) { return extractInt(o1) - extractInt(o2); } int extractInt(String s) { String num = s.replaceAll("\D", ""); // return 0 if no digits found return num.isEmpty() ? 0 : Integer.parseInt(num); }});
这是一个测试:
public static void main(String[] args) throws IOException { List<String> strings = Arrays.asList("room1.2", "foo1.1", "foo", "room2.3", "room100.999", "room10", "room.3"); Collections.sort(strings, new Comparator<String>() { public int compare(String o1, String o2) { return extractInt(o1) - extractInt(o2); } int extractInt(String s) { String num = s.replaceAll("\D", ""); // return 0 if no digits found return num.isEmpty() ? 0 : Integer.parseInt(num); } }); System.out.println(strings);}
输出:
[foo, room1, room2, room10, room100]
当数字为小数时(也表示Java 8+样式):
public static void main(String[] args) { List<String> strings = Arrays.asList("room1.2", "foo1.1", "room2.3", "room100.999", "room10", "room.3"); Collections.sort(strings, Comparator.comparing(Application::extractDouble)); System.out.println(strings);}static double extractDouble(String s) { String num = s.replaceAll("[^\d.]", ""); // return 0 if no digits found return num.isEmpty() ? 0 : Double.parseDouble(num);}
结果:
[foo, room.3, foo1.1, room1.2, room2.3, room10, room100.999]
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