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public class Item<E extends Comparable<E>> {
private E value;
private Item<E> previous;
private Item<E> next;
public Item(E value) {
this.value = value;
previous = null;
next = null;
}
public void addBefore(Item<E> newItem) {
newItem.next = this;
newItem.previous = this.previous;
if (this.previous != null)
this.previous.next = newItem;
this.previous = newItem;
}
// append at tail
public void addAfter(Item<E> newItem) {
newItem.previous = this;
this.next = newItem;
}
public E getValue() {
return value;
}
public Item<E> getNext() {
return next;
}
}
public class MyList<E extends Comparable<E>> {
private Item<E> head;
public void add(E value) {
if (head == null)
head = new Item<E>(value);
else {
Item<E> temp = head;
Item<E> newItem = new Item<E>(value);
do {
if (value.compareTo(temp.getValue()) < 0) {
temp.addBefore(newItem);
if (head == temp)
head = newItem;
return;
}
if (temp.getNext() == null)
break;
temp = temp.getNext();
} while (true);
temp.addAfter(newItem);
}
}
public void print() {
Item<E> temp = head;
while (temp != null) {
System.out.println(temp.getValue());
temp = temp.getNext();
}
}
}
public class Main {
public static void main(String[] args) {
MyList<Integer> list = new MyList<Integer>();
list.add(5);
list.add(3);
list.add(7);
list.add(4);
list.print();
}
} |