Question

The following code has compilation issues. The compilation error is also attached. Please suggest solution to the same.

Code:

import java.util.*;

class test{

    int key;

    public static void main(String []args){
        test obj = new test();
        obj.key = 9999;

        LinkedList al = new LinkedList();
        al.add(obj);

        Iterator itr = al.iterator();
        while(itr.hasNext()){
            test temp = new test();
            temp = itr.next();
            System.out.println(temp.key);
        }   
    }
}

Compilation Error :

test.java:17: error: incompatible types

temp = itr.next();
^

required: test

found: Object

Answer 1

its.next() returns an instance of Object and not the Test

Make it as follows

LinkedList<Test> al = new LinkedList<Test>();
al.add(obj);

Iterator<Test> itr = al.iterator();

So compiler now knows that LinkedList a1 can only hold Test instances so while iterating we will only have instances of Test