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Question about the task

Set of cats

Java Syntax, Level 8, Lesson 11

Under discussion

Been spending the last week on this

1. Inside the Solution class, create a public static Cat class.
2. Implement the createCats method. It must create a Set of cats and add 3 cats to it.
3. In the main method, remove one cat from Set cats.
4. Implement the printCats method. It should display all the cats that remain in the set.
Each cat on a new line.

Requirements:

The program should display text on the screen.
Inside the Solution class, there must be a public static Cat class with a default constructor.
The Solution class's createCats() method must return a Set containing 3 cats.
The Solution class's printCats() method must display all the cats in the set. Each cat on a new line.
The main() method should call the createCats() method once.
The main() method should call the printCats() method.
The main() method must remove one cat from the set of cats.

package com.codegym.task.task08.task0819; import java.util.HashSet; import java.util.Iterator; import java.util.Set; /* Set of cats */ public class Solution { public static void main(String[] args) { Set<Cat> cats = createCats(); Iterator<Cat> it = cats.iterator(); while (it.hasNext()) { it.remove(); break; } printCats(cats); } public static Set<Cat> createCats() { Set<Cat> cats = new HashSet<Cat>(); Cat james = new Cat(); Cat johnny = new Cat(); Cat boris = new Cat(); cats.add(james); cats.add(johnny); cats.add(boris); return cats; } public static void printCats(Set<Cat> cats) { for (Cat catlist : cats) { System.out.println(catlist); } } public static class Cat {} }

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dhanush

Level 30 , Chennai, India

25 August 2020, 07:24

There is a problem in the lines from 16-19, when you iterate the cat object and check whether there is a object or not and the main problem in the line 17 it removes the current line the current line is null,it doesn't read anything if you want to read means you need to call the next() method so that the object is initialized but currently there is no object the iterator is empty I tried your code it gives me a illegalstateexception. use for each loop to call the cat object and delete a cat object and break the statement.