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Java Java Objects (Retired) Creating the MVP Remaining Characters

Posted by Greenie 99
Greenie 99
1,715 Points

Why do I get an IllegalArgumentException here?

Hi,

I'm not sure what's wrong with my code. I'm returning the length of the current text in characters subtracted from 140, which would give me the characters left, right?

Could somebody kindly assist.

Thanks,

Greenie 99

Tweet.java 
public class Tweet {
  private String mText;
  public static final int MAX_CHARACTERS = 140;

  public Tweet(String text) {
    mText = text;
  }

  public String getText() {
    return mText;
  }

  public int charactersLeft(String mText) {
      return 140 - mText.length();
  }

}
Izhar Ashraf
Izhar Ashraf
762 Points

Declare a variable that is named the camel-cased version of "first name". Store the user's first name into this new variable using console.readLine. // I have imported java.io.Console for you. It is a variable called console public class IO{

public static void main(String[] args){

Console console = System.console();
String firstName = console.readLine("What is your name?");

Console.printf("hello my name is %s\n",firstName); } }

//When i am running this code it shows always errors i don't know what to do please help me

4 Answers

Steve Hunter
Steve Hunter
57,712 Points

You can't pass in an argument named the same as the member variable - hence the IllegalArgumentException.

Since your method can access the member variable, you don't need the parameter. Also, USE YOUR CONSTANT!! lol. :+1:

Just try: 

  public int charactersLeft() {
      return MAX_CHARACTERS - mText.length();
  }
Greenie 99
Greenie 99
1,715 Points

Thanks! That makes sense, but I didn't realise that the compiler would take any of that into account.

Pedro Cabral
seal-mask
.a{fill-rule:evenodd;}techdegree
Pedro Cabral
Full Stack JavaScript Techdegree Student 23,916 Points
Pedro Cabral
.a{fill-rule:evenodd;}techdegree
Pedro Cabral
Full Stack JavaScript Techdegree Student 23,916 Points

The new method shouldn't take any parameters, you should remove the (String mText) because that is already stored as an object property.

Greenie 99
Greenie 99
1,715 Points

Thank you. That makes sense!

Izhar Ashraf
Izhar Ashraf
762 Points
Izhar Ashraf
Izhar Ashraf
762 Points

Declare a variable that is named the camel-cased version of "first name". Store the user's first name into this new variable using console.readLine.

// I have imported java.io.Console for you.  It is a variable called console
public class IO{

public static void main(String[] args){

    Console console = System.console();
    String firstName = console.readLine("What is your name?");
  Console.printf("hello my name is %s\n",firstName);
  }
}

//When i am running this code it shows always errors i don't know what to do please help me

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

HI Izhar,

You have written too much code!

Firstly, you don't need the main method and secondly, the system console is already provided for you in a variable called console.

To complete that part of the challenge you just need the line of code you have written:

String firstName = console.readLine("What is your name?");

Let me know how you get on.

Steve.