task08.task0802 - HashMap of 10 pairs

Question about the task

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task08.task0802 - HashMap of 10 pairs Initialization failing verify. why?

Create a HashMap<String, String>, and add 10 string pairs:
watermelon - melon,
banana - fruit,
cherry - fruit,
pear - fruit,
cantaloupe - melon,
blackberry - fruit,
ginseng - root,
strawberry - fruit,
iris - flower,
potato - tuber.
Display the contents of the collection, each element on a new line.

Example output: (here we just show one line):
potato - tuber

Requirements:

Declare a HashMap variable with (String, String) pairs and immediately initialize it.
The program should not read values from the keyboard.
The program should add 10 string pairs to the collection in accordance with the conditions.
The program should display the contents of the collection on the screen, each pair on a new line.

package com.codegym.task.task08.task0802; /* HashMap of 10 pairs */ import java.util.HashMap; import java.util.Map; public class Solution { public static void main(String[] args) throws Exception { //write your code here Map m1 = new HashMap(); m1.put("watermelon", "melon"); m1.put("banana", "fruit"); m1.put("cherry", "fruit"); m1.put("pear", "fruit"); m1.put("cantaloupe", "melon"); m1.put("blackberry", "fruit"); m1.put("ginseng", "root"); m1.put("strawberry", "fruit"); m1.put("iris", "flower"); m1.put("potato", "tuber"); Map<String, String> map = new HashMap<>(m1); //map.putAll(m1); for (Map.Entry<String, String> pair : map.entrySet()) { String key = pair.getKey(); // Key String value = pair.getValue(); // Value System.out.println(key + " - " + value); } } }

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Jyothi

Level 20 , United States

11 December 2018, 18:23

Thank you both. I removed the extra step (map) and initialized per HashMap<String, String> m1 = new HashMap<>(); It worked.

Khurram

Level 16 , Lahore, Pakistan

11 December 2018, 17:27

try initializing like this HashMap<String, String> m1 = new HashMap<>();

Guadalupe Gagnon

Level 37 , Tampa, United States

11 December 2018, 16:53

Why the extra step? Rewrite your code as such:

HashMap<String, String> m1 = new HashMap<>();
        m1.put("watermelon", "melon");
        m1.put("banana", "fruit");
        m1.put("cherry", "fruit");
        m1.put("pear", "fruit");
        m1.put("cantaloupe", "melon");
        m1.put("blackberry", "fruit");
        m1.put("ginseng", "root");
        m1.put("strawberry", "fruit");
        m1.put("iris", "flower");
        m1.put("potato", "tuber");

for (Map.Entry<String, String> pair : m1.entrySet()) ....