why it prints null?

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There is a HashMap<String, String>. 10 different strings have been added to it.
Display a list of keys on the screen, each element on a new line.

Requirements:

The program must create a HashMap variable with (String, String) elements. The variable must be initialized immediately.
The program should not read values from the keyboard.
The program should add 10 different strings to the collection in accordance with the conditions.
The printKeys() method should display the keys in the collection, each element on a new line.

package com.codegym.task.task08.task0804; import java.util.HashMap; import java.util.Map; /* Display a list of keys */ public class Solution { private static String pair; public static void main(String[] args) throws Exception { HashMap<String, String> map = new HashMap<String, String>(); map.put("Sim", "Sim"); map.put("Tom", "Tom"); map.put("Arbus", "Arbus"); map.put("Baby", "Baby"); map.put("Cat", "Cat"); map.put("Dog", "Dog"); map.put("Eat", "Eat"); map.put("Food", "Food"); map.put("Gevey", "Gevey"); map.put("Hugs", "Hugs"); printKeys(map); } public static void printKeys(Map<String, String> map) { //write your code here HashMap<String, String> m = new HashMap<>(); for(HashMap.Entry<String,String> pair : map.entrySet()); System.out.println(pair); } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

27 December 2018, 21:30

solution

Please attach your code like this next time:

your problem is that you have a ';' at the end of your for loop:

for(HashMap.Entry<String,String> pair : map.entrySet()); //< get rid of that

also, you are suppose to only print the keys in this lesson. Change the code here to print the key only:

System.out.println(pair);

Raisa Toscano

Level 22 , Tepic, Mexico

27 December 2018, 21:38

thanks you're right!!