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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. import java.util.HashMap;
  7. import java.util.Map;
  8. import java.util.concurrent.atomic.AtomicInteger;
  9.  
  10. /* Name of the class has to be "Main" only if the class is public. */
  11. class Ideone
  12. {
  13. 	public static void main (String[] args) throws java.lang.Exception
  14. 	{
  15. 	 Map<String, Map<String, Integer>> before = new HashMap<>();
  16.         Map<String, Integer> map11 = new HashMap<>();
  17.         map11.put("foo", 1);
  18.         before.put("foo", map11);
  19.         Map<String, Integer> map12 = new HashMap<>();
  20.         map12.put("bar", 2);
  21.         before.put("bar", map12);
  22.         Map<Integer, Map<String, Integer>> after = new HashMap<>();
  23.  
  24.         System.out.println(before);
  25.  
  26.         before.values().forEach(value -> after.put(after.size(), value));
  27.  
  28.         System.out.println(after);
  29. 	}
  30. }
Success #stdin #stdout 0.2s 33244KB
comments (?)
stdin 
Standard input is empty
stdout 
{bar={bar=2}, foo={foo=1}}
{0={bar=2}, 1={foo=1}}
https://ideone.com/6mDzgw
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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