Implement The Skeleton Code
package jp.co.worksap.global;
import java.util.NoSuchElementException;
/**
*/
public class ImmutableQueue<E> {
/**
- requires default constructor.
*/
public ImmutableQueue() {
// modify this constructor if necessary, but do not remove default constructor
}
// add other constructors if necessary
/**
Returns the queue that adds an item into the tail of this queue without modifying this queue.
e.g.
When this queue represents the queue (2, 1, 2, 2, 6) and we enqueue the value 4 into this queue,
this method returns a new queue (2, 1, 2, 2, 6, 4)
and this object still represents the queue (2, 1, 2, 2, 6) .
If the element e is null, throws IllegalArgumentException.
@param e
@return
@throws IllegalArgumentException
*/
public ImmutableQueue<E> enqueue(E e) {
return null;
}
/**
Returns the queue that removes the object at the head of this queue without modifying this queue.
e.g.
When this queue represents the queue (7, 1, 3, 3, 5, 1) ,
this method returns a new queue (1, 3, 3, 5, 1)
and this object still represents the queue (7, 1, 3, 3, 5, 1) .
If this queue is empty, throws java.util.NoSuchElementException.
@return
@throws java.util.NoSuchElementException
*/
public ImmutableQueue<E> dequeue() {
return null;
}
/**
Looks at the object which is the head of this queue without removing it from the queue.
e.g.
When this queue represents the queue (7, 1, 3, 3, 5, 1),
this method returns 7 and this object still represents the queue (7, 1, 3, 3, 5, 1)
If the queue is empty, throws java.util.NoSuchElementException.
@return
@throws java.util.NoSuchElementException
*/
public E peek() {
return null;
}
/**
*/
public int size() {
return -1;
}
}
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import java.util.NoSuchElementException;
/**
* The Queue class represents an immutable first-in-first-out (FIFO) queue of objects.
* @param <E>
*/
public class
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import java.util.NoSuchElementException;
/**
The Queue class represents an immutable first-in-first-out (FIFO) queue of objects.
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