شرح برامج بلغة الجافا

import java.io.*;

import java.util.*;
 class pArrayQueue{
    protected Object[] array;
    protected int start,end;
    protected boolean full;

    public pArrayQueue(int maxsize){        //constructor
        array = new Object[maxsize];
        start = end = 0;
        full = false;
    }
    public boolean isEmpty(){                      //method
        return ((start == end) && !full);
    }
    public void insert(Object o){                   //method
        if(!full)
            array[start = (++start % array.length)] = o;
        if(start == end)
            full = true;
    }
    public Object remove(){
        if(full)
            full = false;
        else if(isEmpty())
            return null;
        return array[end = (++end % array.length)];
    }
}
class pArrayQueueTest{
    public static void main(String[] args){
        pArrayQueue q = new pArrayQueue(10);
        Integer j = null;
        int i;
        System.out.println("starting...");
        for(i=0;i<10;i++){
            j = new Integer((int)(Math.random() * 100));
            q.insert(j);
            System.out.println("insert: " + j);
        }
        while(!q.isEmpty()){
            System.out.println("remove: " + ((Integer)q.remove()));
        }
        System.out.println("Done ;-)");
    }
}

وهذا البرنامج الثاني

import java.util.Stack;

public class Stk {
  public static void main(String args[]) {
    Stack s = new Stack();
    s.push("Java");
    s.push("Forums");
    s.push("and");

    System.out.println("Next: " + s.peek());
    s.push("Tips");
   System.out.println(s.pop());
    s.push(".");
    int count = s.search("scd");
    while (count != -1 && count > 1) {
      s.pop();
      count--;
    }
    System.out.println(s.pop());
   System.out.println(s.empty());

  }
}