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StackQ1.java
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StackQ1.java
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// push DATA on the bottom of stack..
import java.util.*;
public class StackQ1 {
public static void pushAtBottom(int data,Stack<Integer>s)
{
if(s.isEmpty())
{
s.push(data);
return;
}
int top=s.pop();
pushAtBottom(data,s);
s.push(top);
}
// Reversing a Stack.....
public static void reverse(Stack<Integer>s)
{
if(s.isEmpty())
{
return;
}
int top=s.pop();
reverse(s);
pushAtBottom(top,s);
}
public static void main(String args[])
{
Stack<Integer> s=new Stack<>();
s.push(1);
s.push(2);
s.push(3);
s.push(4);
reverse(s);
// pushAtBottom(5,s);
while(!s.isEmpty())
{
System.out.println(s.peek());
s.pop();
}
}
}