java code for Collection: Map

import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;


public class MapDemo {
public static void main(String[] args) throws Exception {
Velocity.init();
Template t = Velocity.getTemplate("./src/mapProperty.vm");

VelocityContext ctx = new VelocityContext();

Map map = new HashMap();
map.put("firstName", "Joe");
map.put("lastName", "Yin");
ctx.put("map", map);

Writer writer = new StringWriter();
t.merge(ctx, writer);

System.out.println(writer);

}
}

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My first name is $map.firstName
My last name is $map.lastName