如何排序在java中有字符串，整数和字母数字的集合 [英] how to sort a collection which has strings, integers and alphanumerics in java

问题描述

有一些值，如AB，A012B，CD，1,10,01,9
我要分配它们
输出shud是
01,1,9,10 ，A012B，AB，CD
可以使用任何集合
我试图使用collection.sort函数
，但它认为一切都是字符串
和打印像01,1,10,9 ，A012B，AB，CD
it not my req ... Pls help

there are some values like AB, A012B, CD,1,10,01,9 I HAVE TO SORT THE THEM the output shud be 01,1,9,10,A012B,AB,CD can use any collection im trying to use collection.sort function but its considering everything as string and printing like 01,1,10,9,A012B,AB,CD its not my req... Pls help

推荐答案

//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

//这里是鱼

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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