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Thread: Stack Array..

  1. #1
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    Smile Stack Array..

    can somebody tell me how to create stack array in easy way and can make me and others like me easy to understand? please


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    Smile Re: Stack Array..

    anyway, im doin some home that my lecturer gave to me, so here what i done so far...
    import java.util.*;
    public class Usestack {
    public static void main(String args[]){
        Scanner sc;
        sc=new Scanner (System.in);
     
        int n;
     
        System.out.println("enter the size of stack");
        n=sc.nextInt();
        Stack s=new Stack();
        int choice;
     
        do{
            System.out.print("1. push, 2. pop, 3. display, 0. exit, enter your choice: ");
            choice=sc.nextInt();
            switch(choice){
                case 1:
                int value;
                System.out.print("enter element to push: ");
                value=sc.nextInt();
                s.push(value);
                break;
     
                case 2:
                s.pop();
     
                break;
     
                case 3:
                System.out.println(s);
                break;
     
                case 0:
                break;
     
                default:System.out.println("invalid choice");
            }
        }while(choice!=0);
     }
    }

    when i click run the program, it can be 'use', but... my lecturer said that my ARRAY size no function, that true, when i run the program the first line said "enter the size of stack", so i enter 2 or 3 size of stack, but then, the program show that i can push many element as i want, more than what i enter the size of stack, so how to do the stack size(to input)...

  3. #3
    Super Moderator helloworld922's Avatar
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    Default Re: Stack Array..

    The Java stack class extends the Vector super class, so it will automatically expand itself when you try to add elements beyond the current size.

    If you really want to limit the stack size, you need to check the size in case 1 before allowing the user to push more onto the stack:

    case 1:
         if (s.size() < n)
         {
              // code to add new element to stack
         }
         else
         {
              System.out.println("You've reached the stack limit!");
         }
         break;

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