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ReverseStack.java
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ReverseStack.java
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package stacks;
import java.util.Stack;
public class ReverseStack {
/*
* Reverse a stack
* */
private static Stack<Character> stack = new Stack<>();
public static void reverseStack() {
if(!stack.isEmpty()) {
char c = stack.peek();
stack.pop();
reverseStack();
insertAtBottom(c);
}
}
private static void insertAtBottom(char c) {
if(stack.isEmpty()) {
stack.push(c);
} else {
char a = stack.peek();
stack.pop();
insertAtBottom(c);
stack.push(a);
}
}
public static void main(String[] args) {
// push elements into
// the stack
stack.push('1');
stack.push('2');
stack.push('3');
stack.push('4');
System.out.println("Original Stack");
System.out.println(stack);
// function to reverse
// the stack
reverseStack();
System.out.println("Reversed Stack");
System.out.println(stack);
}
}