can any one please explain

Question about the task

Resolved

what happened in the foreach loop mean how at the place of cat object address how uppercase String will print Can any one explain how toString method call ?

Comments (6)

Popular
New
Old

You must be signed in to leave a comment

Shaik Azharuddin

Level 19 , India

15 July 2020, 10:52

how the tostring method is called unless we are using object.method operation

Skynet

Level 40 , USA

28 March 2020, 14:37

Where is the code? Delete this question and create a new one with the code attached. Otherwise, we cannot see what you've done so far.

Ashish RajAnand

Level 13 , Bhilai , India

29 March 2020, 01:49

public class Solution {
    public static void main(String[] args) throws Exception {
        String[] cats = new String[]{"Tiger", "Missy", "Smokey", "Marmalade", "Oscar", "Snowball", "Boss", "Smudge", "Max", "Simba"};

        HashMap<String, Cat> map = addCatsToMap(cats);

        for (Map.Entry<String, Cat> pair : map.entrySet()) {
            System.out.println(pair.getKey() + " - " + pair.getValue());
        }
    }


    public static HashMap<String, Cat> addCatsToMap(String[] cats) {
        HashMap<String ,Cat> s=new HashMap<>();
        for(int i=0;i<cats.length;i++){
            Cat cat=new Cat(cats[i]);
            s.put(cats[i],cat);
        }


        return  s;
    }


    public static class Cat {
        String name;

        public Cat(String name) {
            this.name = name;
        }

        @Override
        public String toString() {
            return name != null ? name.toUpperCase() : null;
        }
    }
}

Skynet

Level 40 , USA

29 March 2020, 13:30

Don't quite get your question about the for each loop, sorry. The code above doesn't pass verification? Are you asking about the syntax in the toString() method and what it means?

Ashish RajAnand

Level 13 , Bhilai , India

29 March 2020, 13:42

Sorry to say i passed verification. My question is how in for loop System.out.println(pair.getKey() + " - " + pair.getValue()); how will print the Cat object because here we define Map<String,Cat> Cat is object and how object will return by using toString method

Seb

Level 41 , Crefeld, Germany

29 March 2020, 14:35

solution

pair.getValule() calls the cat object - and when you print out the cat object in this context, it will use the toString method of the Cat class, and thus print out the cat's name in upper case letters. System.out.println(cat) and System.out.println(cat.toString()) have the same effect.