Creating stack of stack in Java

Question

I want to create a stack of Integer stack. So that I can push a new integer stack in main stack.

How to create it? I have done the following code for that:

import java.util.*;
import java.io.*;

public class Containers{
    static Stack<Integer> subStack = new Stack<Integer>();
    static Stack<subStack> main  = new Stack<subStack>();
   public static int addToStatck(char cont){
       //for(int j=0;j<)
        return 0;
    }
    public static void main(){
        Scanner sc = new Scanner(System.in);
        String container = sc.next();
        Stack sub = new Stack();
        sub.push(container.charAt(0));
        main.push(sub);
        int ans = 0;
        for(int i=0;i<container.length();++i){
            ans+=addToStatck(container.charAt(i));
        }

    }

}

it Shows me the following output:

Eran · Accepted Answer · 2017-12-24 12:49:38Z

3

There is no subStack type (unless you create such type).

The type of main should be:

static Stack<Stack<Integer>> main = new Stack<>();

And there doesn't seem to be any use to your

static Stack<Integer> subStack = new Stack<Integer>();

variable.

Besides,

Stack sub = new Stack();

should be

Stack<Integer> sub = new Stack<>();

To summarize:

public class Containers{
    static Stack<Stack<Integer>> main = new Stack<>();
    public static int addToStatck(char cont){
        //for(int j=0;j<)
        return 0;
    }
    public static void main(){
        Scanner sc = new Scanner(System.in);
        String container = sc.next();
        Stack<Integer> sub = new Stack<>();
        sub.push(Integer.valueOf (container.charAt(0)));
        main.push(sub);
        int ans = 0;
        for(int i=0;i<container.length();++i){
            ans+=addToStatck(container.charAt(i));
        }   
    }  
}

edited Dec 24, 2017 at 12:49

answered Dec 24, 2017 at 6:59

Eran

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8 Comments

Andy.inamdar Over a year ago

import java.util.*; import java.io.*; public class Containers{ static Stack<Stack<Character>> main = new Stack(); public static int addToStatck(char cont){ return 0; } public static void main(){ Scanner sc = new Scanner(System.in); String container = sc.next(); Stack<Character> sub = new Stack<Character>(); sub.push(container.charAt(0)); main.push(sub); int ans = 0; for(int i=0;i<container.length();++i){ ans+=addToStatck(container.charAt(i)); } } }

Andy.inamdar Over a year ago

I have done the above code. But it still showing me the error: Container.java contains unchecked or unsafe operation.

Eran Over a year ago

@Andy.inamdar Either change your inner Stack to a Stack<Character>, or change sub.push(container.charAt(0)); to sub.push(Integer.valueOf (container.charAt(0)));

Eran Over a year ago

@Andy.inamdar you can't add a char to a Stack of Integer, since there's no automatic conversion from char to Integer.

Andy.inamdar Over a year ago

I haven't created the stack of integer. I have created the of character.

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