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The class defines nine members: the two fields: end and size; the five methods: add(), get(), iterator(), size(), and toString(); and the two classes: RingIterator and Node The RingIterator class extends the Iterator class to support the iterator() method Instances of the Node class are used to hold the list s data and to maintain their links The AbstractList class, which this Ring class extends, requires only its get() and size() methods to be overridden For our specific purposes, we also override the add(), iterator(), and toString() methods We plan to use this class to solve the Josephus problem (in Example 76), and for that we ll need to add elements to the ring, iterate around the ring, and print the ring The end field references the node that references the beginning node in the list, that is, it points to the beginning of the list.

Since we are using only one link per node (a singly linked list ), we have to have direct access to the predecessor of any node that might have to be deleted The end reference is null when the list is empty The size field keeps count of how many elements are in the list Initially 0, it is incremented in the add() method (line 12), decremented in the iterator s remove() method (line 77), and returned in the size() method (line 43) The add() method invokes the Node class s constructor (lines 7 and 10) to create a new node for the specified element If the list is empty, it sets its end field to a single node that points to itself Otherwise, the new node is inserted immediately after the end node, and then the new reference is set to that new node.

Figure 5-2 when Y = $600. Investment spending is $100, the distance between the consumption line and the aggregate spending line. c. When output is below the equilibrium level of output, investment injections are greater than saving leakages, e.g., saving is $50 when Y = $400 while I = $100. When output is above the equilibrium level of output, investment injections are smaller than saving leakages, e.g., saving is $150 when Y = $600 while I = $100. At equilibrium, saving leakages equal investment injections. Solved Problem 5.3 a. Find the value of the multiplier when MPC = 0.50, 0.75, and 0.80. b. Find the relationship between the multiplier and the MPC. c. Find the change in the equilibrium level of output when there is a $10 increase in net export spending and the MPC = 0.50, 0.75, and 0.80.

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This way, new elements are always added to the end of the ring (See Figure 72) The get() method is required by the AbstractList class It uses a reference pointer p at line 20 to count the specified number of nodes to return access to the element with the specified index number The iterator() method uses the RingIterator constructor at line 28 to return an iterator on the ring The RingIterator class has two fields, both Node references The last field points to the last node.

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