java 自定義雙向連結串列
阿新 • • 發佈:2019-01-03
/**
* 自定義雙向連結串列
*
* @author 馮趙楊
* @date 2018年4月10日
*/
public class DoubleLink<E> {
private int n;
private Node first;
private Node last;
private class Node {
E value;
Node next;
Node prev;
@Override
public String toString() {
return value + " ";
}
}
/**
* 新增
*
* @author 馮趙楊
*/
public void add(E value) {
Node oldlast = last;
last = new Node();
last.value = value;
last.next = null;
if (n == 0) {
first = last;
} else {
oldlast.next = last;
last.prev = oldlast;
last.next = first;
//System.out.println("last.value=" + last.value + ",last.prev=" + last.prev + ",last.next=" + last.next);
}
n++;
}
/**
* 反轉
*
* @author 馮趙楊
*/
public DoubleLink<E> reverse(DoubleLink<E> link) {
DoubleLink<E> newLink = new DoubleLink<E>();
Node node = link.last;
for (int i = 0; i < link.n; i++) {
newLink.add(node.value);
node = node.prev;
}
return newLink;
}
@Override
public String toString() {
StringBuilder str = new StringBuilder();
Node node = first;
for (int i = 0; i < n; i++) {
str.append(node);
node = node.next;
}
return str.toString();
}
public static void main(String[] args) {
DoubleLink<Integer> doubleLink = new DoubleLink<Integer>();
doubleLink.add(1);
doubleLink.add(2);
doubleLink.add(3);
//原雙向連結串列輸出
System.out.println(doubleLink.toString());
//倒置後雙向連結串列輸出
System.out.println(doubleLink.reverse(doubleLink));
}
}