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How to sort a treemap based on its values?

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萌比男神i
萌比男神i 2020-12-01 04:53

How can I sort a treemap using its values rather than the key?

9条回答
  • 天命终不由人
    天命终不由人 (楼主)
    2020-12-01 05:35

    That's I have done this..

    package Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;

class MyComparator implements Comparator {

    public int compare(Object o1, Object o2) {
        return (((Integer) o2).compareTo((Integer) o1));
    }
}

class MyComparator1 implements Comparator {
    Map map;

    public MyComparator1(Map m) {
        this.map = m;
    }

    public int compare(Object o1, Object o2) {
        return (((String) map.get(o1)).compareTo((String) map.get(o2)));
    }
}

public class Map1 {
    public static void main(String[] args) {
        Map hmap = new HashMap();
        hmap.put(5, "Ashok");
        hmap.put(21, "Bhanu");
        hmap.put(7, "chaman");
        hmap.put(28, "dheeraj");
        hmap.put(761, "edison");
        hmap.put(1, "frank");
        hmap.put(-6, "gopal");
        hmap.put(78, "hari");
        System.out.println("Hash Map:" + hmap);
        Map tmap = new TreeMap<>(hmap);
        System.out.println("Tree Map:" + tmap);
        MyComparator comp = new MyComparator();
        Map itmap = new TreeMap<>(comp);
        itmap.putAll(hmap);
        System.out.println("Tree Map Inreverse order:" + itmap);
        Map orderValuemap = new TreeMap(new 
            MyComparator1(hmap));
            orderValuemap.putAll(hmap);
            orderValuemap.put(22,"hello");
        for(Entry mp:orderValuemap.entrySet())
            System.out.println("Value : "+mp.getValue());
    }
}

    
    
             
    
                                                        
    
            
            
    
              
                
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