CODEWITHSUNDEEP
java
user5268786
user5268786

Reputation:

Must qualify the allocation with an enclosing instance of type Main (e.g. x.new A() where x is an instance of Main)

How to fix below error? I need quick help.

Exception in thread "main" java.lang.Error: Unresolved compilation problem: No enclosing instance of type Main is accessible. Must qualify the allocation with an enclosing instance of type Main (e.g. x.new A() where x is an instance of Main).

at com.common.Main.main(Main.java:16)

Here is my code for reference. If we fixed that this issue then "John" should be printed only once and not twice. How we can restrict "John" to print once

public class Main {
    public static void main(String[] args) {
        Set<Person> l = new HashSet<Person>();
        l.add(new Person("John"));
        l.add(new Person("John"));
        l.add(new Person("Matt"));
        l.add(new Person("Deepak"));
        l.add(new Person("Chris"));

        for (Iterator iterator = l.iterator(); iterator.hasNext();) {
            Person person = (Person) iterator.next();
            System.out.println(person.getName());
      }
    }

    public class Person{
        private String name;

        public Person(String name) {
            super();
            this.setName(name);
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }
}

Upvotes: 1

Views: 1762

Answers (2)

Eran
Eran

Reputation: 393781

Since your Person class doesn't look like it should be an inner class (i.e. it doesn't look like it requires an associated instance of the enclosing Main class), make it static (i.e. a nested class of the Main class, which doesn't require an enclosing instance) :

public static class Person { ...

or move it outside your Main class.

EDIT :

As for your second issue, override equals and hashCode in your Person class, in order to let HashSet know when two objects should be considered identical :

public boolean equals (Object other) {
    if (!(other instanceof Person))
        return false;
    Person op = (Person) other;
    return this.name.equals(op.name);
}

public int hashCode () {
    return name.hashCode();
}

Upvotes: 3

Ramanlfc
Ramanlfc

Reputation: 8354

Person is an inner class of Main and since it's not static main can't access it.

Upvotes: 1

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