Coding Help

I hate to make two topics in one day, but what the hell; I'll do it anyways.

Bare with me, as I've only watched a couple 10 minute tutorials in java.

I'm trying to write a basic translator of a single latin word to english. Here's my code

Code:

import java.util.Scanner;
public class  Main {
   public static void main(String args[]){
      Scanner scanner = new Scanner(System.in);
      
      System.out.println("Enter a noun or verb.");
      String Word = scanner.next(); 
         if (Word == "neco"){
            System.out.println("Kill"); }
            else System.out.println("I suck at coding.");
         }
         
}


I type in neco, but all that comes up is the else. What am I doing wrong?

You cant use "==" for string comparisons.
Use x.compareTo(y);

Cheers!
-A

Could you edit the code to fit what you just posted?

patrickfreed wrote:I hate to make two topics in one day, but what the hell; I'll do it anyways.

Bare with me, as I've only watched a couple 10 minute tutorials in java.

I'm trying to write a basic translator of a single latin word to english. Here's my code

Code:

import java.util.Scanner;
public class  Main {
   public static void main(String args[]){
      Scanner scanner = new Scanner(System.in);
      
      System.out.println("Enter a noun or verb.");
      String Word = scanner.next(); 
         if (Word == "neco"){
            System.out.println("Kill"); }
            else System.out.println("I suck at coding.");
         }
         
}


I type in neco, but all that comes up is the else. What am I doing wrong?

When you're comparing strings and objects with ==, it checks if it is the same object, or "alias". The static "neco" with a user inputted "neco" are different objects in the heap. Therefore, they are not equal.
Albuca has it right with x.compareTo(y). That method checks if the objects are the same in content, and not memory location.




Edit: Just ran the code in eclipse.

Code:

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


public class Main
{

  public static void main(String args[])
  {
    Scanner scanner = new Scanner(System.in);

    System.out.println("Enter a noun or verb.");
    String Word = scanner.next();

    if (Word.compareTo("neco") == 0)
    {
      System.out.println("Kill");
    }
    else
      System.out.println("I suck at coding.");
  }

}


The compareTo returns an int value based on if it's similar. 0 if it is, and 1 if it isn't. Since the if statement needs a boolean value, you need to turn it into a true or false by adding the "== 0" to it.

so it would look like:

Code:

import java.util.Scanner;
public class  Main {
   public static void main(String args[]){
      Scanner scanner = new Scanner(System.in);
      
      System.out.println("Enter a noun or verb.");
      String Word = scanner.next(); 
         if (Word.compareTo("neco"))
            System.out.println("Kill");
         
   }
         }

This is giving me a ton of errors. I'm sorry, but I fail at this.

patrickfreed wrote:so it would look like:

Code:

import java.util.Scanner;
public class  Main {
   public static void main(String args[]){
      Scanner scanner = new Scanner(System.in);
      
      System.out.println("Enter a noun or verb.");
      String Word = scanner.next(); 
         if (Word.compareTo("neco"))
            System.out.println("Kill");
         
   }
         }

This is giving me a ton of errors. I'm sorry, but I fail at this.

Look at my code.

Alright that makes sense. thanks.
Also, I'm going to add one of those if statements for each word I add to the dictionary, is there a way I can add a "master" else so that if the word doesn't match any of the if statements, it prints "That word is not in the dictionary"?

patrickfreed wrote:Alright that makes sense. thanks.
Also, I'm going to add one of those if statements for each word I add to the dictionary, is there a way I can add a "master" else so that if the word doesn't match any of the if statements, it prints "That word is not in the dictionary"?

Do you have skype? Onlyme395

I do but it's almost 11 pm and I have an exam tomorrow. Can I talk to you tomorrow or sometime this week?
btw it's patrickfreed1

if {}
else if{}
else if{}
else if{}
else {}

Etc etc etc.
Pm me your skype.

-A

is albuca your skype?

Holy crap I cannot understand a word you guys are saying!
<-not a computer/coding geek

Watch 30 minutes of java tutorials and you'll understand most of this ;p

Anything with dots returns strange symbols and strange words just makes my eyes dizzy

I'd love to see Liz try to make sense of this :3

My sense of it:

Get a fucking Latin dictionary. :3

No, get google translator <_>

Albuca wrote:if {}
else if{}
else if{}
else if{}
else {}

Etc etc etc.
Pm me your skype.

-A

No. Just no. If you want to add more words then rewrite the code to use, for example, a hashtable.
Anyways if you STILL do not have this running... check you }'s... I can see at least 2 errors with them in the pasted code.
Disregard that, it is just your horrible copy-paste work.

Ok, I'll look into hashtables, it just seems too complicated for an hour's worth of learning java. (I just went over while loops, scanners, and if statements)

Better to do it "complicated" first than to start off on the wrong foot and teach yourself some SERIOUSLY bad coding practices.

Yeah that's why I posted it here, because even I could tell that hundreds of if statements would be a horrible technique.

FillerB wrote:

Albuca wrote:if {}
else if{}
else if{}
else if{}
else {}

Etc etc etc.
Pm me your skype.

-A

No. Just no. If you want to add more words then rewrite the code to use, for example, a hashtable.
Anyways if you STILL do not have this running... check you }'s... I can see at least 2 errors with them in the pasted code.
Disregard that, it is just your horrible copy-paste work.

Hey now, I gave him the nitty gritty, super basic run down of how to do if-else's.
Its not pretty, and its not supposed to be XP.
If he wanted to get more complicated he could read/write the words to a file, and have 4 options (lookup, add, delete, exit).

-A

And as I said: it's seriously bad practice. While legal you shouldn't do it if it isn't absolutely necessary.

Lizardman wrote:My sense of it:

Get a fucking Latin dictionary. :3

Lol Ikr I just can't make any sense out of this whatsoever

If you got nothing to add then why bother posting at all?

[quote=&quot;patrickfreed&quot;]I'd love to see Liz try to make sense of this :3[/quote]

Dat's why I posted. :3

Edit: why is the quote function fucked up? >.>

Is there such thing as a Class file executer GUI?
I want to sell this to the freshman to help them out with latin, but I feel like navigating through the command line isn't too user friendly.

Go look into Spring Framework.

What is it exactly?

It's a framework to make GUIs in Java. Not exactly newb friendly but it is the simplest way to make a GUI under Java that I know of. Then again I know very little of Java (more into the C's/Python)

Class Description wrote:VISUAL BASIC PROGRAMMING I & II(950, 952)/one semester each
Students will learn to problem solve and think critically in the Visual Basic.Net graphical user interface (GUI) environment. No computer programming experience is required. The curriculum includes an introduction to Visual Basic .Net, Variables and Constants, Control Statements, Decisions Structures, Looping Structures, Procedures, Mathematical and Business Functions, Arrays and Structures, Color and Graphics, Creating Classes, Using Files, Sorting and Searching, and Advanced Topics if time permits. Advanced assignments include building user interactive games. Open to all students.

I'm taking this next year, so I wanted to get some knowledge of coding, and since I play Minecraft, why not do Java?

Anyways, to solve the GUI problem, I'll just have people plop the class into their C:\Users\Name directory, so all they have to do is type "Java Latin Dictionary"

I'm following [You must be registered and logged in to see this link.] as a start, I don't know where I'll go from there.

Meh, I dislike the VB(A/.NET) syntax. While the basic ideas behind it are also in just about every modern language... dat syntax.

Im gonna try to take java classes over the summer, until then that may as well BE in latin

I learned about Arrays and decided to put them to a use. (This isn't really functional, it was just practice for me)
It's a grade book average thingy. You start off with one grade of 100%, and then you can either add 1 more grade or 2 more.

Let me know if there's any bugs if you do try it.
[You must be registered and logged in to see this link.]

I fail at coding... But the farthest I've got is with Python... ^_^

If you know one of them, you could easily pick up another though.


I just learned Array Tables, so I coded a weight loss chart that spans 4 weeks.
Again it's not very useful, but it is practice and might be helpful to people learning java if they read the source.

[You must be registered and logged in to see this link.]

I'm way late here, but can't help myself

Code:


Word.equals("neco")


returns boolean, no need to bother with compareTo.

Also, hashtables and collections in general may seem complicated at first glance, but they are in fact plain simple to use

Code:


Map<String,String> dictionary = new HashMap<String,String>(); //create a dictionary (also called associative array, or map) that maps one string to another

dictionary.put("Neco","Kill"); //stuff shit in

System.out.println("Translation of Neco is " + dictionary.get("Neco")); //profit


That could use some error-handling Embair.

patrickfreed wrote:If you know one of them, you could easily pick up another though.

That's not completely true. Knowledge of ASM, SQL or Haskell (to name a few) is worth fuckall if your trying to learn C(++/#.NET) or Java.

That it sure could Filler , was just trying to show the basics as simply as possible. I probably should have shown the usage of directory.containsKey() right away though, you got point.

Code:


if (!directory.containsKey("Neco")) System.out.println("dunno how to translate Neco");


Exactly a one month necro...I feel dirty
Anyways, can someone tell me what's going on in these videos?

vids:

From his faulty description of "this", I don't really understand what's going on in those.

this description:

Not gonna watch the videos but judging from the titles it's about scope resolution.

pseudocode ahoy

Code:


Class Dog{
  private String breed
  private Int age

  public Dog(string breed, int age)
      this.breed = breed
      this.age = age
]


The this-keyword in the constructor is necessary for the compiler to differentiate between the parameter-breed and the instance variable-breed. So "this.breed = breed" mean set my instance variable "breed" to the given parameter called "breed". You could also do something like this and then the this-keyword wouldn't be necessary:

Code:


Class Dog
  private string iBreed
  private int iAge

  public Dog(string breed, int age)
      iBreed = breed
      iAge = age
]


Getters and setters are just functions to manipulate the private instance variabels of a class. In the examples I used you would have for example getBreed, getAge() and setAge(int). setBreed(string) is possible but rather useless since the breed of a dog doesn't change.

I skimmed through the videos and gotta say that guy seems pretty clueless. Even if I overlook the fact that he is oblivous to the meaning of the this keyword. No decent java programmer would start a class name with lower case for instance. I guess the tutorial is somewhat usable, but be prepared that you might learn a bunch of bad coding practices in the process. But enough rumbling.

For the general meaning of the this keyword
1. Completely and thoroughly forget what the guy in the video says.
2. Refer to Fillers post.

As for the multiple constructors example in the video. It shows a special usage of this keyword, which is allowed only at the beginning of constructors. You got four constructors defined, but only one of them directly initializes the fields (the one that takes three parameters). Let's call him the smart guy. The other three constructors just know how to call the smart guy with some parameters. So, when you call

tuna tunaObect = new tuna();

the following happens:
1. the constructor tuna() is called
2. but he's like "meh, screw this, let the smart guy do it"
3. thus, the constructor tuna(0,0,0) is called

The second line illustrates the meaning of the this(0,0,0); statement.

What I'm also surprised by is that he is using inline-ifs in a tutorial that is only now covering setters/getters, his references to "military" time instead of "normal" time and NOT using or showing Eclipse's generate getter/setter function.

embair wrote:tuna tunaObect = new tuna();

the following happens:
1. the constructor tuna() is called
2. but he's like "meh, screw this, let the smart guy do it"
3. thus, the constructor tuna(0,0,0) is called

The second line illustrates the meaning of the this(0,0,0); statement.

So if I were to put
tuna tunaObject = new Tuna(5)
the constructor this(h,0,0) would be called?

Yep

Thanks guys.