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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12.  
  13.         Map < Integer, Integer > myMap = Map.of ( 1 , 111 , 4 , 444 , 2 , 222 , 3 , 333 , 5 , 555 );
  14.  
  15.         Set < Integer > allKeys = myMap.keySet ();
  16.         List < Integer > sortedKeys = new ArrayList <> ( allKeys );
  17.         Collections.sort ( sortedKeys );
  18.         List < Integer > targetKeys = new ArrayList < Integer > ( sortedKeys.subList ( 0 , 3 ) );
  19.  
  20.         for ( Integer targetKey : targetKeys )
  21.         {
  22.             Integer value = myMap.get ( targetKey );
  23.             System.out.println ( "value: " + value );
  24.         }
  25.  
  26. 	}
  27. }
Success #stdin #stdout 0.09s 35944KB
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Standard input is empty
stdout
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value: 111
value: 222
value: 333
https://ideone.com/1pAmZg
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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