1、TreeMap集合倒序排列

import java.util.Comparator;

/**

 * 比较算法的类，比较器

 * @author Administrator

 *

 */

public class MyCmp implements Comparator<Object> {

    // 实现倒序

    @Override

    public int compare(Object o1, Object o2) {

        int x =  o2.toString().compareTo(o1.toString());

        return x;

    }

}

import java.util.Iterator;

import java.util.TreeMap;

public class TestMap {

    public static void main(String[] args) {

        TreeMap<String,String>  map = new TreeMap<String,String> (new MyCmp());

        map.put("10001","张某");

        map.put("10005","孙某");

        map.put("10003","方某");

        map.put("10004","谭某");

        map.put("10002","李某");

        Iterator<String> it = map.keySet().iterator();

        while(it.hasNext()){

            String key = it.next();

            System.out.println(key+"="+map.get(key));

        }

    }

}

2、TreeMap中文排序

import java.text.CollationKey;

import java.text.Collator;

import java.util.Comparator;

/**

 * 处理中文排序

 * @author Administrator

 *

 */

public class MyCmp1 implements Comparator<Object> {

    Collator collator = Collator.getInstance();

    /**

     * 提供以与自然语言无关的方式来处理文本，日期，数字和消息的类和接口

     * 获取当前默认语言环境的Collator

     */

    @Override

    public int compare(Object o1, Object o2) {

        // TODO Auto-generated method stub

        CollationKey key1 = collator.getCollationKey(o1.toString());

        CollationKey key2 = collator.getCollationKey(o2.toString());

        return key1.compareTo(key2);

    }

}

import java.util.Iterator;

import java.util.Map.Entry;

import java.util.Set;

import java.util.TreeMap;

public class TestMap1 {

    public static void main(String[] args) {

        TreeMap<String,String> map = new TreeMap<String,String>(new MyCmp1());

        map.put("艾伦", "1001");

        map.put("过去", "1002");

        map.put("以后", "1003");

        map.put("明天", "1004");

        map.put("未来", "1005");

        Set<Entry<String,String>> set = map.entrySet();

        Iterator<Entry<String,String>> it = set.iterator();

        while(it.hasNext()){

            Entry<String, String> e = it.next();

            System.out.println(e.getKey()+"="+e.getValue());

        }

    }

}