|
import java.util.ArrayDeque;
import java.util.Deque;
public class IntegerStack {
private Deque<Integer> data = new ArrayDeque<Integer>();
public void push(Integer element) {
data.addFirst(element);
}
public Integer pop() {
return data.removeFirst();
}
public Integer peek() {
return data.peekFirst();
}
public String toString() {
return data.toString();
}
public static void main(String[] args) {
IntegerStack stack = new IntegerStack();
for (int i = 0; i < 5; i++) {
stack.push(i);
}
System.out.println("After pushing 5 elements: " + stack);
int m = stack.pop();
System.out.println("Popped element = " + m);
System.out.println("After popping 1 element : " + stack);
int n = stack.peek();
System.out.println("Peeked element = " + n);
System.out.println("After peeking 1 element : " + stack);
}
}
/*After pushing 5 elements: [4, 3, 2, 1, 0]
Popped element = 4
After popping 1 element : [3, 2, 1, 0]
Peeked element = 3
After peeking 1 element : [3, 2, 1, 0]*/
|