Question

In Java language:

1. The complement of a queue is a stack. It uses first-in, last-out accessing and is often likened to a stack of plates. The first plate put on the table is the last plate used. Create a stack class called Stack that can hold characters. Call the methods that access the stack push( ) and pop( ). Allow the user to specify the size of the stack when it is created. Keep all other members of the Stack class private. (Hint: You can use the Queue class as a model; just change the way the data is accessed.) Add a custom exceptions to your class that report stack full and stack empty conditions.

2. Create a HelloWorld Swing application.

Answer 1

1.

import java.util.*;

public class Stack
{
static int s;
static int top = 0;

private static void push_element (Stack <Character> stack,char i, int s)
{
if (top < s)
{
   stack.push (i);
   top++;
}
else
System.out.println ("stack is full");

}

private static void pop_element (Stack <Character> stack)
{
if (top >0)
{
   System.out.println (stack.pop ());
   top--;
}
else
System.out.println ("stack is empty");

}

public static void main (String[]args)
{
Scanner sc = new Scanner (System.in);
System.out.println ("Enter the size of stack");
s = sc.nextInt();
Stack <Character> stack = new Stack <Character> ();
stack.setSize(s);
push_element (stack,'A',s);
push_element (stack,'B',s);
push_element(stack,'C',s);
push_element(stack,'C',s);
pop_element(stack);
pop_element(stack);
pop_element(stack);
pop_element(stack);
}
}

2.

import java.awt.Dimension;
import javax.swing.JFrame;

public class Main {

public static void main(String args[]){
JFrame jf = new JFrame("Hello world");

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(new Dimension(200,200));

jf.setVisible(true);
}
}