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POUsing BlueJ, I can 'Pop' & 'Push' but can't 'Top'?
 

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  1. POUsing BlueJ, I can 'Pop' & 'Push' but can't 'Top'?
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    <p>(student Software Developer here!)</p> <p>We (our class) have recently started a new java topic using BlueJ. This is brand new to me but I am enjoying and half understanding it so far.</p> <p>We have to create a vertically stacked array, using a menu that has 5 options: 1- Push 2- Pop 3- Top 4- Display 5- Quit</p> <p>I have managed to code everything except for 'Top' (display the integer at the top of the stack/array)</p> <p>My lecturer has given us this hint "You could 'Pop' then 'Push' to be able to 'Top'" but I am not too sure how to get it to work?</p> <p>This is my code for the menu:</p> <pre><code>public static void main() { int option; Array a = new Array(); String []menuitems = {"1 - Push","2 - Pop","3 - Top","4 - Display","5 - Quit"}; Menu m = new Menu(menuitems,5); a.add(4);a.add(2);a.add(28);a.add(15); do { clrscr(); option = m.showMenu(); if ( option == 1 ) doPush(a); if ( option == 2 ) doPop(a); if ( option == 3 ) doTop(a); if ( option == 4 ) { a.display(); pressKey(); } } while ( option != 5 ); System.out.println("Done - You Can Now Close"); } </code></pre> <p>This is my code for Push:</p> <pre><code>public static void doPush(Array a) { if ( a.isFull() ) { System.out.print("\nArray Full!"); } else { int item; System.out.print("Enter number to push: "); item = Genio.getInteger(); if ( a.addToFront(item) == false) System.out.print("\nArray Is Full!"); System.out.print("\nArray with new value: \n"); a.display(); } pressKey(); } </code></pre> <p>This is my code for Pop:</p> <pre><code>public static void doPop(Array a) { if ( a.isEmpty() ) { System.out.println("\nArray is Empty!"); pressKey(); return; } else { int item; item = Genio.getInteger(); System.out.println("\nArray popped!"); } pressKey(); } </code></pre> <p>Hopefully I am on the right track and any help would greatly appreciated!</p> <p>Thanks in advance. </p>
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    1. COJust pop the element, return it, and then push it back onto the data structure.
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