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Iterator in java is used to iterate Collection to retrieve elements one by one.

Iterator interface defines these two methods :

1. public boolean hasNext(); // Returns true if the iteration has more elements
2. public Object next(); // Returns the next element in the iteration

This can be understand by a simple code snippet shared below:

    ArrayList names = new ArrayList();
    names.add("jack");
    names.add("james");
    names.add("Don");

    Iterator it = names.iterator();
    while(it.hasNext()) { // it.hasNext() checking if iterator has next value?
      String name= (String)it.next(); // it.next() returning the next value
      System.out.println(name);
    }

Hope this will clear your doubt.

Happy Coding!!!