TreeMap中文排序,TreeMap倒序输出排列

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());
        }
    }
}