Java数据结构和算法--栈与队列

(1)栈 

package ChapterOne;

public class Stack {
    //栈数组
    long stackArr[];
    //栈的大小
    int maxSize;
    //栈的顶部
    int top;
    //初始化一个大小为size的栈
    public Stack(int size){
        maxSize = size;
        stackArr = new long[size];
        top = -1;
    }
    //出栈操作
    public long pop(){
        return stackArr[top--];
    }
    //进栈操作
    public void push(long value){
        stackArr[++top] = value;
    }
    //判断栈是否为空
    public boolean isEmpty(){
        return top == -1;
    }
    //判断栈是否已满
    public boolean isFull(){
        return top == maxSize-1;
    }
    //取栈顶元素
    public long peek(){
        return stackArr[top];
    }
    public static void main(String[] args) {
        Stack stack = new Stack(10);
        while(!stack.isFull()){
            long v = (long) (Math.random()*100);
            stack.push(v);
            System.out.print(v+" ");
        }
        System.out.println();
        while(!stack.isEmpty()){
            long topValue = stack.pop();
            System.out.print(topValue+" ");
        }
        System.out.println();
    }
}

(2)队列 

package ChapterOne;

public class Queue {
    //队列数组
    private long queueArr[];
    //队列的前端下标
    private int front;
    //队列的尾端下标
    private int rear;
    //队列的大小
    private int maxSize;
    //队列中元素的个数
    private int nItems;
    //初始化一个大小为size的队列
    public Queue(int size){
        queueArr = new long[size];
        maxSize = size;
        front = 0;
        rear = -1;
        nItems = 0;
    }
    //插入操作
    public void insert(long value){
        //队列已满
        if(rear == maxSize-1)
            rear = -1;
        queueArr[++rear] = value;
        nItems++;
    }
    //删除操作
    public long remove(){
        long temp = queueArr[front++];
        if(front == maxSize)
            front = 0;
        nItems--;
        return temp;
    }
    //返回队列第一个元素
    public long peakFront(){
        return queueArr[front];
    }
    //判断是否为空
    public boolean isEmpty(){
        return nItems == 0;
    }
    //判断是否已满
    public boolean isFull(){
        return nItems == maxSize;
    }
    //返回队列中元素的个数
    public int size(){
        return nItems;
    }

    public void print(){
        for(int i = front;i < front+nItems;i++){
            System.out.print(queueArr[i]+" ");
        }
        System.out.println();
    }

    public static void main(String[] args) {
        Queue q = new Queue(10);
        while(!q.isFull()){
            long value = (long)(Math.random()*100);
            q.insert(value);
        }
        q.print();
        while(!q.isEmpty()){
            q.remove();
            q.print();
        }
        q.print();
        System.out.println(q.isEmpty());
    }
}

(3)优先队列 

package ChapterOne;

public class PriorityQueue {
font-size: 1em; margin-top: 0px; margin-right: 0px; margin-bot

  


  
    
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      2011-04-01 00:10
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      分类:编程语言      
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