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42 lines
1.3 KiB
Java
42 lines
1.3 KiB
Java
/*
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Sort or order a HashMap or TreeSet or any map item by value. Write a comparator
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which compares by value, not by key. Entry class might hleps you here.
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*/
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.Map.Entry;
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public class OrderByValue
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{
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public static void main(String a[])
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{
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Map<String, Integer> map = new HashMap<String, Integer>();
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map.put("java", 20);
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map.put("C++", 45);
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map.put("Java2Novice", 2);
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map.put("Unix", 67);
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map.put("MAC", 26);
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map.put("Why this kolavari", 93);
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Set<Entry<String, Integer>> set = map.entrySet();
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List<Entry<String, Integer>> list = new ArrayList<Entry<String, Integer>>(set);
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Collections.sort( list, new Comparator<Map.Entry<String, Integer>>()
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{
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public int compare( Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2 )
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{
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return (o2.getValue()).compareTo( o1.getValue() );
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}
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} );
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for(Map.Entry<String, Integer> entry:list)
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{
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System.out.println(entry.getKey()+" ==== "+entry.getValue());
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}
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}
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}
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