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42 lines (31 loc) · 863 Bytes
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ReverseStack.java
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42 lines (31 loc) · 863 Bytes
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import java.util.Stack;
public class ReverseStack {
public static void main(String[] args) {
Stack<Integer> list = new Stack<>();
list.push(10);
list.push(20);
list.push(30);
list.push(40);
System.out.println("Before Reverse : " +list);
reverse(list);
System.out.println("After Reverse: " +list);
}
static void PushAtButtom(Stack<Integer> list, int element) {
// base case
if (list.isEmpty()) {
list.push(element);
return;
}
int top = list.pop();
PushAtButtom(list, element);
list.push(top);
}
static void reverse(Stack<Integer> list){
if(list.isEmpty()){
return;
}
int top = list.pop();
reverse(list);
PushAtButtom(list, top);
}
}