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Stack2.java
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Stack2.java
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// using ARRAYLIST........
import java.util.ArrayList;
public class Stack2 {
static ArrayList<Integer> list=new ArrayList<>();
public static boolean isEmpty()
{
return list.size()==0;
}
// push....
public static void push(int data)
{
list.add(data);
}
//pop.............
public static int pop()
{
if(isEmpty())
{
return-1;
}
int top =list.get(list.size()-1);
list.remove(list.size()-1);
return top;
}
// Again inserting to the same position......
public int peek() {
if(isEmpty()) {
return -1;
}
return list.get(list.size()-1);
}
public static void main(String args[]) {
Stack2 stack = new Stack2();
stack.push(1);
stack.push(2);
stack.push(3);
stack.push(4);
while(!stack.isEmpty()) {
System.out.println(stack.peek());
stack.pop();
}
}
}