小编典典

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() {

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 strings = Arrays.asList("room1.2", "foo1.1", "foo", "room2.3", "room100.999", "room10", "room.3");

Collections.sort(strings, new Comparator() {

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 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]

2020-09-08