IfTest3.java

package chapter9;

/*Create an interface variable and access stacks through it */
public class IfTest3 {
    public static void main(String[] args) {
        IntStack mystack; //Create an interface reference variable
        DynStack ds = new DynStack(5);
        FixedStack fs = new FixedStack(8);

        mystack = ds; //load dynamic stack
        //push some numbers onto the stack
        for (int i = 0; i < 12; i++) mystack.push(i);

        mystack = fs; //load fixed stack
        //push some numbers onto the stack
        for (int i = 0; i < 8; i++) mystack.push(i);

        mystack = ds;
        System.out.println("Values in dynamic stack ");
        for (int i = 0; i < 12; i++)
            System.out.println(mystack.pop());

        mystack = fs;
        System.out.println("Values in fixed stack");
        for (int i = 0; i < 8; i++)
            System.out.println(mystack.pop());
    }
}