# Java Exercises: Nth element from the bottom of the stack

## Java Stack: Exercise-16 with Solution

Write a Java program to get the nth element from the bottom of the stack.

Sample Solution:

Java Code:

``````import java.util.Scanner;

public class Stack {
private int[] arr;
private int top;

// Constructor to initialize the stack
public Stack(int size) {
arr = new int[size];
top = -1;
}

// Method to push an element onto the stack
public void push(int num) {
if (top == arr.length - 1) {
System.out.println("Stack is full");
} else {
top++;
arr[top] = num;
}
}

// Method to pop an element from the stack
public int pop() {
if (top == -1) {
System.out.println("Stack Underflow");
return -1;
} else {
int poppedElement = arr[top];
top--;
return poppedElement;
}
}

// Method to get the top element of the stack
public int peek() {
if (top == -1) {
System.out.println("Stack is empty");
return -1;
} else {
return arr[top];
}
}

// Method to check if the stack is empty
public boolean isEmpty() {
}

public int getNthElementFromBottom(int n) {
if (n < 1 || n > top + 1) {
System.out.println("Invalid value of n");
return -1;
}
return arr[n - 1];
}

// Method to display the elements of the stack
public void display() {
if (top == -1) {
System.out.println("Stack is empty");
} else {
System.out.print("Stack elements: ");
for (int i = top; i >= 0; i--) {
System.out.print(arr[i] + " ");
}
System.out.println();
}
}

public static void main(String[] args) {
System.out.println("Initialize a stack:");
Stack stack = new Stack(5);
System.out.println("Input some elements on the stack:");
stack.push(1);
stack.push(2);
stack.push(3);
stack.push(4);
stack.push(5);
stack.display();
int n = stack.getNthElementFromBottom(2);
System.out.println("\nThe 2nd element from the bottom is " + n);
n = stack.getNthElementFromBottom(3);
System.out.println("\nThe 3rd element from the bottom is " + n);
n = stack.getNthElementFromBottom(4);
System.out.println("\nThe 4th element from the bottom is " + n);

}
}
```
```

Sample Output:

```Initialize a stack:
Input some elements on the stack:
Stack elements: 5 4 3 2 1

The 2nd element from the bottom is 2

The 3rd element from the bottom is 3

The 4th element from the bottom is 4

```

Flowchart:

Live Demo:

Java Code Editor:

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Java Stack Previous: Nth element from the top of the stack.
Java Stack Exercises Next: Move the nth element from the top of the stack to the top.

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