/*
implementation of stacks using arrays
creating stack of integers
*/
import java.io.*;
class
MyStackException extends Exception
{
MyStackException(String str)
{
super("You Got an Exception :
\n"+str);
}
}
class MyStack
{
private int top=-1,arr[],size;
MyStack(int size)
{
this.size=size;
arr=new int[size];
}
public void push(int element)throws
MyStackException
{
if(top+1==size)
throw new
MyStackException("OVERFLOW !!!");
else
arr[++top]=element;
}
public int pop()throws MyStackException
{
if(top==-1)
throw new
MyStackException("UNDERFLOW !!!");
else
return arr[top--];
}
public int peek()throws MyStackException
{
if(top==-1)
throw new
MyStackException("UNDERFLOW !!!");
else
return arr[top];
}
public boolean isEmpty()
{
if(top==-1)
return true;
return false;
}
public int getSize()
{
return size;
}
public int getTop()
{
return top;
}
}
class Main
{
public static void main(String args[])
throws IOException
{
BufferedReader br=new
BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the size
of the array : ");
int
n=Integer.parseInt(br.readLine());
MyStack stack=new MyStack(n);
while(true)
{
System.out.println("___________________________________\n");
System.out.println("You
have the following choices : \n");
System.out.println("1.
PUSH");
System.out.println("2.
POP");
System.out.println("3.
PEEK");
System.out.println("4.
get size of Stack");
System.out.println("5.
Check whether the stack is empty or not...");
System.out.println("6.
EXIT\n");
System.out.print("Enter
your choice : ");
int
ch=Integer.parseInt(br.readLine());
switch(ch)
{
case 1:
System.out.print("Enter
the number that you want to push : ");
int
element=Integer.parseInt(br.readLine());
try
{
stack.push(element);
System.out.println("Element
pushed successfully...");
}
catch(MyStackException
e){System.out.println(e.getMessage());}
break;
case 2:
try
{
System.out.println(stack.pop()+"
popped successfully...");
}
catch(MyStackException
e){System.out.println(e.getMessage());}
break;
case 3:
try
{
System.out.println("the
top of the stack is : "+stack.peek());
}
catch(MyStackException
e){System.out.println(e.getMessage());}
break;
case 4:
System.out.println("The
Maximum size of your stack is : "+stack.getSize());
System.out.println("The
current size of your stack is : "+(stack.getTop()+1));
break;
case 5:
System.out.println("Is
your stack Empty ? "+stack.isEmpty());
break;
case 6:
System.exit(0);
default:
System.out.println("wrong
choice entered...\nPlease enter a valid choice...");
}
}
}
}
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