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Pushing one map into another in Java...

import java.util.*;
Map m1 = ...;
Map m2 = ...;
m2.putAll(m1); // adds all elements of m1 to m2

Working with Dates in Java.. Formating the dates....

import java.io.*; 
import java.util.*; 
import java.text.*; 
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy.MM.dd H:mm");
Date now = new Date();
System.out.println(formatter.format(now)); // 2001.3.19 13:21
formatter.applyPattern("dd MMM yyyy");
System.out.println(formatter.format(now)); // 19 Mar 2001