Doubt in compiling the code

#1

I am not able to understand the code compilation ,please tell the error in my code and suggest changes.

#2

@Adhyayan,
Please share your code as well.

#3

import java.util.*;
public class Main {

public static void main(String[] args) throws Exception {
	// TODO Auto-generated method stub
	Scanner s = new Scanner(System.in);
	
	int n = s.nextInt();
	Main mainobj = new Main();
	StacksUsingArrays stack = mainobj.new StacksUsingArrays(1000);
	StacksUsingArrays stack2=mainobj. new StacksUsingArrays(1000);
	public  void enqueue(int n) throws Exception{
		int c=0;
		while(c<n){
			while(!stack.isEmpty()){
				stack2.push=stack.pop();
			}
			stack.push(c);
			while(!stack2.isEmpty()){
				stack.push=stack2.pop();
			}
			c++;
		}

	}
	public  void dequeue() throws Exception{
		while(!stackisEmpty()){
			int ans =stack.pop();
		    System.out.print(ans+" ");

		}
	}
		




private class StacksUsingArrays {
	private int[] data;
	private int tos;

	public static final int DEFAULT_CAPACITY = 10;

	public StacksUsingArrays() throws Exception {
		// TODO Auto-generated constructor stub
		this(DEFAULT_CAPACITY);
	}

	public StacksUsingArrays(int capacity) throws Exception {
		if (capacity <= 0) {
			System.out.println("Invalid Capacity");
		}
		this.data = new int[capacity];
		this.tos = -1;
	}

	public int size() {
		return this.tos + 1;
	}

	public boolean isEmpty() {
		if (this.size() == 0) {
			return true;
		} else {
			return false;
		}
	}

	public void push(int item) throws Exception {
		if (this.size() == this.data.length) {
			throw new Exception("Stack is Full");
		}
		this.tos++;
		this.data[this.tos] = item;
	}

	public int pop() throws Exception {
		if (this.size() == 0) {
			throw new Exception("Stack is Empty");
		}
		int retVal = this.data[this.tos];
		this.data[this.tos] = 0;
		this.tos--;
		return retVal;
	}

	public int top() throws Exception {
		if (this.size() == 0) {
			throw new Exception("Stack is Empty");
		}
		int retVal = this.data[this.tos];
		return retVal;
	}

	public void display() throws Exception {
		if (this.size() == 0) {
			throw new Exception("Stack is Empty");
		}
		for (int i = this.tos; i >= 0; i--) {
			System.out.println(this.data[i]);
		}

	}

}

}

#4

@Adhyayan,
Here is your correct code: https://ide.codingblocks.com/s/205427
Please create different classes of stack and Main.

#5

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