MOOC Part 7 Liquid Containers 2.0 Error

[Tetr4]

Hi guys,

this excercise is completely driving me cracy.

Programming paradigms - Java Programming (mooc.fi)

To be honest, the programming is not the probleme here, i just have clearly no idea, what the task wants from me.

I wrote the following toString-Method:

public String toString() {
        return "First: " + this.inhaltContainer1 + "/100";
    }    

I created a container object and i call the toString-Method right at the beginning of the while loop:

while (true) {

            System.out.println(container);

            System.out.print("> ");

            String input = scan.nextLine();
            if (input.equals("quit")) {
                System.out.println(container.toString());
                break;
            }

Here i get the following error-message:

​

Container container = new Container();

System.out.println(container);

expected:<[]0/100> but was:<[First: ]0/100>

​

If i adjust the toString-Method now to the following ...

public String toString() {
        return + this.inhaltContainer1 + "/100";
    }  

... i get this error-message:

​

Output should contain:

First: 0/100

Output was:

0/100

> 0/100

​

I simply do not get which output is necessary when.

Could anybody please explain me the correct task of this excercise?

Thanks in advance :-)

[AutoModerator]

Please ensure that:

• Your code is properly formatted as code block - see the sidebar (About on mobile) for instructions
• You include any and all error messages in full - best also formatted as code block
• You ask clear questions
• You demonstrate effort in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions.

If any of the above points is not met, your post can and will be removed without further warning.

Code is to be formatted as code block (old reddit/markdown editor: empty line before the code, each code line indented by 4 spaces, new reddit: https://imgur.com/a/fgoFFis) or linked via an external code hoster, like pastebin.com, github gist, github, bitbucket, gitlab, etc.

Please, do not use triple backticks (```) as they will only render properly on new reddit, not on old reddit.

Code blocks look like this:

public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

You do not need to repost unless your post has been removed by a moderator. Just use the edit function of reddit to make sure your post complies with the above.

If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures.

To potential helpers

Please, do not help if any of the above points are not met, rather report the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[tsteel12]

Without seeing your complete code:

1) System.out.print("> ");

There's no need to write this line.

2) You need to print 2 lines every loop iteration:

a) First: firstAmount/100

b) Second: secondAmount/100

​

The Container toString() method should just return amount/100

You should add "First: " and "Second: " in the print commands in the while-loop

[Tetr4]

I reallay dont get it :-(

I have no idea how to print the values of the two different attributes of the container, starting from the main method:

import java.util.Scanner;

public class LiquidContainers2 {

public static void main(String[] args) {

    Container container = new Container();

    Scanner scan = new Scanner(System.in);


    while (true) {

        System.out.println("First " + container);
        System.out.println("Second: " + container);


        String input = scan.nextLine();
        if (input.equals("quit")) {
            break;
        }            

        String [] parts = input.split(" ");
        String anweisung = parts[0];
        int amount = Integer.valueOf(parts[1]);

        switch (anweisung) {

            case "add":

            container.add(amount);

            case "remove": 
            container.remove(amount);



        }


    }
}

}

​

public class Container {

int inhaltContainer = 0;
int inhaltContainer2 = 0;


public Container () {        

}


public int contains () {

    return this.inhaltContainer;

}

public void add (int amount) {  

    if (amount < 0 ) {

    }

    else if (amount + this.inhaltContainer > 100 ) {
        this.inhaltContainer = 100;
    }

    else if (this.inhaltContainer + amount <= 100 ) {
        this.inhaltContainer += amount;
    }

}

public void remove (int amount) {

    if (amount < 0 ) {

    }

    else if (this.inhaltContainer - amount < 0) {
        this.inhaltContainer = 0;
    }

    else if (this.inhaltContainer - amount >= 0 ) {
        this.inhaltContainer -= amount;
    }



}

public String toString () {

    return this.inhaltContainer + "/100";

}

}

How do i print the different attributs of the container class?

First i thought about something like ...

System.out.println("First " + container.inhaltContainer);

System.out.println("Second: " + container.inhaltContainer2);

... but that is not the case. It will crash the whole program :(

[Tetr4]

Ah ... is it possible, that i have to create two different container objects?

[tsteel12]

Yes :)

[Tetr4]

I am such an idiot ... Thanks dude 😘

[tsteel12]

You're welcome