How to sort a property object wrt its values?

[pjerald]

Hello,

I have a bit of code that prints the counts of objects in a list. i want to sort it by its count.

code :

package util;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import org.apache.commons.collections.CollectionUtils;

public class Count
{
    public static void main(String args[]) throws Exception
    {
        ArrayList al = new ArrayList();
        al.add("a");
        al.add("a");
        al.add("a");
        al.add("a");
        al.add("a");
        al.add("b");
        al.add("b");
        al.add("c");
        al.add("d");
        
        System.out.println(al);
        printcounts(al);
    }

    private static void printcounts(ArrayList<String> al)
    {
        HashSet ht = new HashSet(al);
        Iterator<String> it = ht.iterator();
        while(it.hasNext())
        {
            String str = it.next();
            int count = CollectionUtils.cardinality(str, al);

            System.out.println("word : "+str+" count : "+count);
        }
    }
}

output :
[a, a, a, a, a, b, b, c, d]
word : d count : 1
word : b count : 2
word : c count : 1
word : a count : 5


i want to be,

[a, a, a, a, a, b, b, c, d]
word : a count : 5
word : b count : 2
word : d count : 1
word : c count : 1

How to do this?


Thanks and regards
jerald

[pjerald]

how to sort a property object wrt its values?

i have done the code but with normal replacement sorting algorithm...

package util;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Properties;
import org.apache.commons.collections.CollectionUtils;

public class Count
{
    public static void main(String args[]) throws Exception
    {
        ArrayList al = new ArrayList();
        al.add("a");
        al.add("a");
        al.add("a");
        al.add("a");
        al.add("a");
        al.add("b");
        al.add("b");
        al.add("c");
        al.add("d");
        
        System.out.println(al);
        printcounts(al);

        Properties hm = new Properties();
        hm.setProperty("a", "a");
        hm.setProperty("a", "a");
        hm.setProperty("a", "a");
        System.out.println(hm);
    }

    public static void printcounts(ArrayList<String> al)
    {
        HashSet ht = new HashSet(al);
        Iterator<String> it = ht.iterator();
        ArrayList<String> list1 = new ArrayList();
        ArrayList<Integer> list2 = new ArrayList<Integer>();
        while(it.hasNext())
        {
            String str = it.next();
            int count = CollectionUtils.cardinality(str, al);
            list1.add(str);
            list2.add(count);
        }
        System.out.println("List1 :"+list1);
        System.out.println("List2 :"+list2);

        for(int i=0;i<list2.size();i++)
        {
            Integer val = list2.get(i);
            String vals = list1.get(i);
            for(int j=0;j<i;j++)
            {
                if(val.intValue() < list2.get(j))
                {
                    int temp = list2.get(j);
                    list2.set(j, val);
                    list2.set(i, temp);

                    String temps = list1.get(j);
                    list1.set(j, vals);
                    list1.set(i, temps);
                }
            }
        }

        //printing :
        for(int i=0;i<list2.size();i++)
        {
            System.out.println(list1.get(i)+" "+list2.get(i));
        }
    }
}

let me know if there is some API to do this?