The following question is based on your reading of “the book of songs.” which phrase summarizes the theme of the three poems?

class CustomDataStructure implements Iterable<> {  

// code for data structure  

public Iterator<> iterator() {  

 return new CustomIterator<>(this);  

}  

}  

class CustomIterator<> implements Iterator<> {  

// constructor  

CustomIterator<>(CustomDataStructure obj) {  

 // initialize cursor  

}  

// Checks if the next element exists  

public boolean has Next() {  

}