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  1. class Stack {
  2.     int[] stackElements;    // the array object 
  3.     int currentSize = 0;    // maximum size of the queue
  4.  
  5.     Stack(int size) {
  6.         // create the array object
  7.         stackElements = new int [size] ; 
  8.     }
  9.  
  10.     void push(int value) {
  11.         // try to put a value on the top of the stack
  12.         // if the stack is full, print an error message
  13.         // if the push operation is successful, print a success message
  14.         if (currentSize==stackElements.length-1){
  15.             System.out.println("stack is full");
  16.         }else
  17.             stackElements[currentSize]=value;
  18.             System.out.println("push sucesed :"+value);
  19.  
  20.     }
  21.  
  22.     int pop() {
  23.         // try to retrieve a value from the top of the stack
  24.         // if the stack is empty, print an error message and return zero
  25.         // if the pop operation is successful, print a success message and 
  26.         // the value of the top element is returned
  27.         if (currentSize==0){
  28.             System.out.println("stack is vacancy");
  29.             return 0;
  30.         }else
  31.            System.out.println("pop sucesed ");
  32.            return (stackElements[currentSize--]);
  33.         }
  34.  
  35. }
  36.  
  37.  
  38. public class StackApp {
  39.  
  40.     public static void main(String[] args) {
  41.         Stack aStack = new Stack(4);
  42.  
  43.         aStack.push(9);
  44.         aStack.push(28);
  45.         aStack.push(47);
  46.  
  47.         System.out.println(aStack.pop());
  48.  
  49.         aStack.push(-56);
  50.         aStack.push(742);
  51.         aStack.push(-99);
  52.  
  53.         System.out.println(aStack.pop()); 
  54.         System.out.println(aStack.pop());
  55.  
  56.         aStack.push(-8);
  57.  
  58.         System.out.println(aStack.pop()); 
  59.         System.out.println(aStack.pop());
  60.         System.out.println(aStack.pop());
  61.         System.out.println(aStack.pop());
  62.  
  63.         aStack.push(44);
  64.         aStack.push(81);
  65.         aStack.push(-7);        
  66.         aStack.push(-106);
  67.  
  68.         System.out.println(aStack.pop()); 
  69.         System.out.println(aStack.pop());
  70.         System.out.println(aStack.pop());
  71.         System.out.println(aStack.pop());
  72.         System.out.println(aStack.pop());
  73.     }
  74.  
  75. }
  76.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:38: error: class StackApp is public, should be declared in a file named StackApp.java
public class StackApp {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/W114Py
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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