Java Programs easy way

package java2;

import java.text.DecimalFormat;

import java.util.HashMap;

import java.util.Set;

public class met {

                public static String output1;

                public static void fn(HashMap<Integer, Float> m1) {

                                Set<Integer> s = m1.keySet();

                                float sum = 0.0f;

                                float avg = 0.0f;

                                int count = 0;

                                for (Integer i : s) {

                                                if (i % 2 == 0) {

                                                                sum = sum + m1.get(i);

                                                                count++;

                                                }

                                }

                                avg = sum / count;

                                DecimalFormat df = new DecimalFormat();

                                output1 = df.format(avg);

                }

                public static void main(String[] args) {

                                HashMap<Integer, Float> m1 = new HashMap<Integer, Float>();

                                m1.put(1, 2.3f);

                                m1.put(2, 4.1f);

                                m1.put(6, 6.2f);

                                fn(m1);

                                System.out.println(output1);

                }

}