CS8382-OBJECT ORIENTED PROGRAMMING LABORATORY-STACK ADT USING JAVA ARRAY WITH EXCEPTION HANDLING

CS8382-OBJECT ORIENTED PROGRAMMING LABORATORY

QUESTION:Design a Java interface for ADT Stack. Implement this interface using array. Provide necessary exception handling in both the implementations.

Program:

import java.io.*;
interface Mystack
{
    public void pop();
    public void push();
    public void display();
}
class Stack_array implements Mystack
{
    final static int n=5;
    int stack[]=new int[n];
    int top=-1;
    public void push()
    {
        try
        {
            BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
            if(top==(n-1))
            {
                System.out.println(" Stack Overflow");
                return;
            }
            else
            {
                System.out.println("Enter the element");
                int ele=Integer.parseInt(br.readLine());
                stack[++top]=ele;
            }
        }
        catch(IOException e)
        {
            System.out.println("e");
        }
    }
    public void pop()
    {
        if(top<0)
        {
            System.out.println("Stack underflow");
            return;
        }
        else
        {
            int popper=stack[top];
            top--;
            System.out.println("Popped element:" +popper);
        }
    }

    public void display()
    {
        if(top<0)
        {
            System.out.println("Stack is empty");
            return;
        }
        else
        {
            String str=" ";
            for(int i=0; i<=top; i++)
                str=str+"  "+stack[i]+" <--";
            System.out.println("Elements are:"+str);
        }
    }
}

 class Main
{
    public static void main(String arg[])throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Implementation of Stack using Array");
        Stack_array stk=new Stack_array();
        int ch=0;
        do
        {
            System.out.println("1.Push 2.Pop 3.Display 4.Exit ");
            System.out.println("Enter your choice:");
            ch=Integer.parseInt(br.readLine());
            switch(ch)
            {
            case 1:
                stk.push();
                break;
            case 2:
                stk.pop();
                break;
            case 3:
                stk.display();
                break;
            case 4:
                System.exit(0);
            }
        }
        while(ch<5);
        
}}
--------------------------------------------------------------------------------------------------------------------------
output:
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
2                                                                                                                                
Stack underflow                                                                                                                  
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
1                                                                                                                                
Enter the element                                                                                                                
1                                                                                                                                
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
1                                                                                                                                
Enter the element                                                                                                                
2                                                                                                                                
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
1                                                                                                                                
Enter the element                                                                                                                
3                                                                                                                                
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
1                                                                                                                                
Enter the element                                                                                                                
4                                                                                                                                
1.Push 2.Pop 3.Display 4.Exit
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
1                                                                                                                                
Enter the element                                                                                                                
5                                                                                                                                
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
1                                                                                                                                
 Stack Overflow                                                                                                                  
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
3                                                                                                                                
Elements are:   1 <--  2 <--  3 <--  4 <--  5 <--                                                                                
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
2                                                                                                                                
Popped element:5                                                                                                                 
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:                                                                                                               
2                                                                                                                                
Popped element:4                                                                                                                 
1.Push 2.Pop 3.Display 4.Exit                                                                                                    
Enter your choice:    4

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