//捕鱼技术
List<String> values = new ArrayList<String>();
values.add("AB");
values.add("A012B");
values.add("CD");
values.add("1");
values.add("10");
values.add("01");
values.add("9");
values.add("I");
Collections.sort(values, new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
// TODO tweak the comparator here
try{
Integer integer1 = Integer.valueOf(o1);
Integer integer2 = Integer.valueOf(o2);
return integer1.compareTo(integer2);
}catch (java.lang.NumberFormatException e) {
return o1.compareTo(o2);
}
}
});
System.out.println(values);
}
//不够？？？
//这是鱼
public static void main(String[] args) throws Exception {
List<String> values = new ArrayList<String>();
values.add("AB");
values.add("A012B");
values.add("CD");
values.add("1");
values.add("10");
values.add("01");
values.add("9");
int maxLen = 0;
for (String string : values) {
if (string.length() > maxLen) {
maxLen = string.length();
}
}
Collections.sort(values, new MyComparator(maxLen));
System.out.println(values);
}
public static class MyComparator implements Comparator<String> {
private int maxLen;
private static final String REGEX = "[0-9]+";
public MyComparator(int maxLen) {
this.maxLen = maxLen;
}
@Override
public int compare(String obj1, String obj2) {
String o1 = obj1;
String o2 = obj2;
// both numbers
if (o1.matches("[1-9]+") && o2.matches("[1-9]+")) {
Integer integer1 = Integer.valueOf(o1);
Integer integer2 = Integer.valueOf(o2);
return integer1.compareTo(integer2);
}
// both string
if (o1.matches("[a-zA-Z]+") && o2.matches("[a-zA-Z]+")) {
return o1.compareTo(o2);
}
Pattern p = Pattern.compile(REGEX);
Matcher m1 = p.matcher(o1);
Matcher m2 = p.matcher(o2);
List<String> list = new ArrayList<String>();
while (m1.find()) {
list.add(m1.group());
}
for (String string : list) {
o1.replaceFirst(string, leftPad(string, "0", maxLen));
}
list.clear();
while (m2.find()) {
list.add(m2.group());
}
for (String string : list) {
o2.replaceFirst(string, leftPad(string, "0", maxLen));
}
return o1.compareTo(o2);
}
}
public static String leftPad(String stringToPad, String padder, Integer size) {
final StringBuilder strb = new StringBuilder(size.intValue());
final StringCharacterIterator sci = new StringCharacterIterator(padder);
while (strb.length() < (size.intValue() - stringToPad.length())) {
for (char ch = sci.first(); ch != CharacterIterator.DONE; ch = sci.next()) {
if (strb.length() < (size.intValue() - stringToPad.length())) {
strb.insert(strb.length(), String.valueOf(ch));
}
}
}
return strb.append(stringToPad).toString();
}
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