1、用鏈表實(shí)現(xiàn)棧

package stack;

/**

*

* @author denghb

*

*/

class Link {

public long dData;

public Link next;

public Link(long dd) {

dData = dd;

}

public void displayLink() {

System.out.print(dData + " ");

}

}

class LinkList {

private Link first;

public LinkList() {

first = null;

}

public boolean isEmpty() {

return (first == null);

}

public void insertFirst(long dd) {

Link newLink = new Link(dd);

newLink.next = first;

first = newLink;

}

public long deleteFirst() {

//假設(shè)這是一個非空鏈表

Link temp = first;

first = first.next;

return temp.dData;

}

public void displayList() {

Link current = first;

while(current != null) {

current.displayLink();

current = current.next;

}

System.out.println("");

}

}

class LinkStack {

private LinkList theList;

public LinkStack() {

theList = new LinkList();

}

public void push(long j) {

theList.insertFirst(j);

}

public long pop() {

return theList.deleteFirst();

}

public boolean isEmpty() {

return (theList.isEmpty());

}

public void displayStack() {

System.out.print("Stack (top-->bottom): ");

theList.displayList();

}

}

public class LinkStackApp {

public static void main(String[] args) {

LinkStack theStack = new LinkStack();

theStack.push(20);

theStack.push(40);

theStack.displayStack();

theStack.push(60);

theStack.push(80);

theStack.displayStack();

theStack.pop();

theStack.pop();

theStack.displayStack();

}

}

2、用鏈表實(shí)現(xiàn)隊列

package queue;

/**

*

* @author denghb

*

*/

class Link {

public long dData;

public Link next;

public Link(long dd) {

dData = dd;

}

public void displayLink() {

System.out.print(dData + " ");

}

}

class FirstLastList {

private Link first;

private Link last;

public FirstLastList() {

first = null;

last = null;

}

public boolean isEmpty() {

return (first == null);

}

public void insertLast(long dd) {

Link newLink = new Link(dd);

if(isEmpty()) {

first = newLink;

} else {

last.next = newLink;

}

last = newLink;

}

public long deleteFirst() {

//假設(shè)這是一個非空鏈表

long temp = first.dData;

if(first.next == null) { //如果只有一個鏈接點(diǎn)

last = null;

}

first = first.next;

return temp;

}

public void displayList() {

Link current = first;

while(current != null) {

current.displayLink();

current = current.next;

}

System.out.println("");

}

}

class LinkQueue {

private FirstLastList theList;

public LinkQueue() {

theList = new FirstLastList();

}

public void insert(long j) {

theList.insertLast(j);

}

public long remove() {

return theList.deleteFirst();

}

public boolean isEmpty() {

return (theList.isEmpty());

}

public void displayStack() {

System.out.print("Stack (top-->bottom): ");

theList.displayList();

}

}

public class LinkQueueApp {

public static void main(String[] args) {

LinkQueue theQueue = new LinkQueue();

theQueue.insert(20);

theQueue.insert(40);

theQueue.displayStack();

theQueue.insert(60);

theQueue.insert(80);

theQueue.displayStack();

theQueue.remove();

theQueue.remove();

theQueue.displayStack();

}

}

第一個源程序的輸出結(jié)果：

Stack (top-->bottom): 40 20

Stack (top-->bottom): 80 60 40 20

Stack (top-->bottom): 40 20

第二個源程序的輸出結(jié)果：

Stack (top-->bottom): 20 40? Stack (top-->bottom): 20 40 60 80? Stack (top-->bottom): 60 80

總結(jié)

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