/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.stream.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
	List<String> data = Arrays.asList("100", "200", "300", "400");
	List<Map<String, String>> map = data.stream()
                                   .map(dataIterate -> new HashMap<String, String>(){{put("amount", dataIterate);}})
                                   .collect(Collectors.toList());
            System.out.println(map);
	}
}

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