Class of Stacks

class Stack {

private int top;

private int val[];

public Stack(int size) {

val = new int [size];

top = -1;

}

public boolean isEmpty() {return top == -1;}

public boolean isFull() {return top >= size-1;}

public void push(int x) {

if (!isFull()){

val[++top] = x;

} else System.out.println("Stack overflow");

}

...

}

int top;

int val[];

isEmpty()

isFull()

push(int x)

int pop()

print()