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0

I have a class in which i declare many words as class variables. And there is a method to choose a random word from those class words. How can i implement getRandomWord properly?

public class Vocabulary

 int numOfWords = 2;

 final static word1 = "hello";
 final static word2 = "stack";
 ...

 public String getRandomWord()
 
 int random = (int)(Math.random() * numOfWords + 1);
 return word + random;
 

I tried to add those words to an ArrayList first and then return the index but i cant understand how to add those words that are already declared in the class to the ArrayList.

java string

share|improve this question

edited Mar 8 at 0:38

Albert Leibnitz

asked Mar 8 at 0:35

Albert LeibnitzAlbert Leibnitz

195

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Create a static List<String> words and there store your words. You can add them in static section manually
  
  – Michał Ziober
  Mar 8 at 0:38
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How can i store the words in a loop? Or i have to store them manually?
  
  – Albert Leibnitz
  Mar 8 at 0:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See static section questions stackoverflow.com/questions/2420389/…
  
  – Michał Ziober
  Mar 8 at 0:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Select random Java variable? Is this possible
  
  – Tom
  Mar 8 at 0:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To extend what @MichałZiober said: that's how you can get a random element from a list: Randomly select an item from a list
  
  – Tom
  Mar 8 at 0:46
  

  
  
  
  

 | 
show 1 more comment

0

I have a class in which i declare many words as class variables. And there is a method to choose a random word from those class words. How can i implement getRandomWord properly?

public class Vocabulary

 int numOfWords = 2;

 final static word1 = "hello";
 final static word2 = "stack";
 ...

 public String getRandomWord()
 
 int random = (int)(Math.random() * numOfWords + 1);
 return word + random;
 

I tried to add those words to an ArrayList first and then return the index but i cant understand how to add those words that are already declared in the class to the ArrayList.

java string

share|improve this question

edited Mar 8 at 0:38

Albert Leibnitz

asked Mar 8 at 0:35

Albert LeibnitzAlbert Leibnitz

195

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Create a static List<String> words and there store your words. You can add them in static section manually
  
  – Michał Ziober
  Mar 8 at 0:38
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How can i store the words in a loop? Or i have to store them manually?
  
  – Albert Leibnitz
  Mar 8 at 0:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See static section questions stackoverflow.com/questions/2420389/…
  
  – Michał Ziober
  Mar 8 at 0:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Select random Java variable? Is this possible
  
  – Tom
  Mar 8 at 0:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To extend what @MichałZiober said: that's how you can get a random element from a list: Randomly select an item from a list
  
  – Tom
  Mar 8 at 0:46
  

  
  
  
  

 | 
show 1 more comment

I have a class in which i declare many words as class variables. And there is a method to choose a random word from those class words. How can i implement getRandomWord properly?

public class Vocabulary

 int numOfWords = 2;

 final static word1 = "hello";
 final static word2 = "stack";
 ...

 public String getRandomWord()
 
 int random = (int)(Math.random() * numOfWords + 1);
 return word + random;
 

I tried to add those words to an ArrayList first and then return the index but i cant understand how to add those words that are already declared in the class to the ArrayList.

java string

share|improve this question

edited Mar 8 at 0:38

Albert Leibnitz

asked Mar 8 at 0:35

Albert LeibnitzAlbert Leibnitz

195

public class Vocabulary

 int numOfWords = 2;

 final static word1 = "hello";
 final static word2 = "stack";
 ...

 public String getRandomWord()
 
 int random = (int)(Math.random() * numOfWords + 1);
 return word + random;
 

share|improve this question

edited Mar 8 at 0:38

Albert Leibnitz

asked Mar 8 at 0:35

Albert LeibnitzAlbert Leibnitz

195

share|improve this question

edited Mar 8 at 0:38

Albert Leibnitz

asked Mar 8 at 0:35

Albert LeibnitzAlbert Leibnitz

195

asked Mar 8 at 0:35

Albert LeibnitzAlbert Leibnitz

195

asked Mar 8 at 0:35

Albert LeibnitzAlbert Leibnitz

195

2 Answers
2

active

oldest

votes

0

If you just want to have one list of words, you should definitely use a Singleton as a static member of your class.
This member should have a List and be created only once.
That's why the constructor should be private.
It should look like this

import java.util.Arrays;

import java.util.List;
public final class Vocabulary
 //The final in the class name is there so you can't heritate from this class
 private static Vocabulary INSTANCE = null;
 private List<String> words;

 //Private so you can't create another instance of it, you need to use static method
 private Vocabulary() 
 this.words = Arrays.asList("hello", "stack", "heap");
 
 //In case you want to implemente other public function
 public static Vocabulary getInstance()
 if(INSTANCE == null)
 INSTANCE = new Vocabulary();
 
 return INSTANCE;
 
 //If you want to choose a word by its number
 public static String getWord(int i)
 return Vocabulary.getVocabulary().get(i);
 
 //Used in getVocabulary, getter of the List
 private List<String> getWords()
 return this.words;
 
 // Return the whole List of words
 public static List<String> getVocabulary()
 return Vocabulary.getInstance().getWords();
 
 // Here your go
 public static String getRandomWord()
 return Vocabulary.getWord((int)(Math.random() * Vocabulary.getVocabulary().size()));
 

And then you can just use it properly :

public static void main(String[] args) 
 System.out.println(Vocabulary.getRandomWord());

Singleton is a well known design pattern and this is a pretty clean way to do it, hope it helps !

share|improve this answer

answered Mar 8 at 2:16

NohTowNohTow

63

add a comment | 

0

Make array like this:

String[] strs = "hello","stack";

Then add then to List<String>.

 List<String> list = Arrays.asList( strs );

share|improve this answer

edited Mar 8 at 2:32

answered Mar 8 at 2:24

Common ManCommon Man

2,24031431

add a comment | 

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0

If you just want to have one list of words, you should definitely use a Singleton as a static member of your class.
This member should have a List and be created only once.
That's why the constructor should be private.
It should look like this

import java.util.Arrays;

import java.util.List;
public final class Vocabulary
 //The final in the class name is there so you can't heritate from this class
 private static Vocabulary INSTANCE = null;
 private List<String> words;

 //Private so you can't create another instance of it, you need to use static method
 private Vocabulary() 
 this.words = Arrays.asList("hello", "stack", "heap");
 
 //In case you want to implemente other public function
 public static Vocabulary getInstance()
 if(INSTANCE == null)
 INSTANCE = new Vocabulary();
 
 return INSTANCE;
 
 //If you want to choose a word by its number
 public static String getWord(int i)
 return Vocabulary.getVocabulary().get(i);
 
 //Used in getVocabulary, getter of the List
 private List<String> getWords()
 return this.words;
 
 // Return the whole List of words
 public static List<String> getVocabulary()
 return Vocabulary.getInstance().getWords();
 
 // Here your go
 public static String getRandomWord()
 return Vocabulary.getWord((int)(Math.random() * Vocabulary.getVocabulary().size()));
 

And then you can just use it properly :

public static void main(String[] args) 
 System.out.println(Vocabulary.getRandomWord());

Singleton is a well known design pattern and this is a pretty clean way to do it, hope it helps !

share|improve this answer

answered Mar 8 at 2:16

NohTowNohTow

63

add a comment | 

0

If you just want to have one list of words, you should definitely use a Singleton as a static member of your class.
This member should have a List and be created only once.
That's why the constructor should be private.
It should look like this

import java.util.Arrays;

import java.util.List;
public final class Vocabulary
 //The final in the class name is there so you can't heritate from this class
 private static Vocabulary INSTANCE = null;
 private List<String> words;

 //Private so you can't create another instance of it, you need to use static method
 private Vocabulary() 
 this.words = Arrays.asList("hello", "stack", "heap");
 
 //In case you want to implemente other public function
 public static Vocabulary getInstance()
 if(INSTANCE == null)
 INSTANCE = new Vocabulary();
 
 return INSTANCE;
 
 //If you want to choose a word by its number
 public static String getWord(int i)
 return Vocabulary.getVocabulary().get(i);
 
 //Used in getVocabulary, getter of the List
 private List<String> getWords()
 return this.words;
 
 // Return the whole List of words
 public static List<String> getVocabulary()
 return Vocabulary.getInstance().getWords();
 
 // Here your go
 public static String getRandomWord()
 return Vocabulary.getWord((int)(Math.random() * Vocabulary.getVocabulary().size()));
 

And then you can just use it properly :

public static void main(String[] args) 
 System.out.println(Vocabulary.getRandomWord());

Singleton is a well known design pattern and this is a pretty clean way to do it, hope it helps !

share|improve this answer

answered Mar 8 at 2:16

NohTowNohTow

63

add a comment | 

If you just want to have one list of words, you should definitely use a Singleton as a static member of your class.
This member should have a List and be created only once.
That's why the constructor should be private.
It should look like this

import java.util.Arrays;

import java.util.List;
public final class Vocabulary
 //The final in the class name is there so you can't heritate from this class
 private static Vocabulary INSTANCE = null;
 private List<String> words;

 //Private so you can't create another instance of it, you need to use static method
 private Vocabulary() 
 this.words = Arrays.asList("hello", "stack", "heap");
 
 //In case you want to implemente other public function
 public static Vocabulary getInstance()
 if(INSTANCE == null)
 INSTANCE = new Vocabulary();
 
 return INSTANCE;
 
 //If you want to choose a word by its number
 public static String getWord(int i)
 return Vocabulary.getVocabulary().get(i);
 
 //Used in getVocabulary, getter of the List
 private List<String> getWords()
 return this.words;
 
 // Return the whole List of words
 public static List<String> getVocabulary()
 return Vocabulary.getInstance().getWords();
 
 // Here your go
 public static String getRandomWord()
 return Vocabulary.getWord((int)(Math.random() * Vocabulary.getVocabulary().size()));
 

And then you can just use it properly :

public static void main(String[] args) 
 System.out.println(Vocabulary.getRandomWord());

Singleton is a well known design pattern and this is a pretty clean way to do it, hope it helps !

share|improve this answer

answered Mar 8 at 2:16

NohTowNohTow

63

import java.util.Arrays;

import java.util.List;
public final class Vocabulary
 //The final in the class name is there so you can't heritate from this class
 private static Vocabulary INSTANCE = null;
 private List<String> words;

 //Private so you can't create another instance of it, you need to use static method
 private Vocabulary() 
 this.words = Arrays.asList("hello", "stack", "heap");
 
 //In case you want to implemente other public function
 public static Vocabulary getInstance()
 if(INSTANCE == null)
 INSTANCE = new Vocabulary();
 
 return INSTANCE;
 
 //If you want to choose a word by its number
 public static String getWord(int i)
 return Vocabulary.getVocabulary().get(i);
 
 //Used in getVocabulary, getter of the List
 private List<String> getWords()
 return this.words;
 
 // Return the whole List of words
 public static List<String> getVocabulary()
 return Vocabulary.getInstance().getWords();
 
 // Here your go
 public static String getRandomWord()
 return Vocabulary.getWord((int)(Math.random() * Vocabulary.getVocabulary().size()));
 

public static void main(String[] args) 
 System.out.println(Vocabulary.getRandomWord());

share|improve this answer

answered Mar 8 at 2:16

NohTowNohTow

63

answered Mar 8 at 2:16

NohTowNohTow

63

answered Mar 8 at 2:16

NohTowNohTow

63

0

Make array like this:

String[] strs = "hello","stack";

Then add then to List<String>.

 List<String> list = Arrays.asList( strs );

share|improve this answer

edited Mar 8 at 2:32

answered Mar 8 at 2:24

Common ManCommon Man

2,24031431

add a comment | 

0

Make array like this:

String[] strs = "hello","stack";

Then add then to List<String>.

 List<String> list = Arrays.asList( strs );

share|improve this answer

edited Mar 8 at 2:32

answered Mar 8 at 2:24

Common ManCommon Man

2,24031431

add a comment | 

Make array like this:

String[] strs = "hello","stack";

Then add then to List<String>.

 List<String> list = Arrays.asList( strs );

share|improve this answer

edited Mar 8 at 2:32

answered Mar 8 at 2:24

Common ManCommon Man

2,24031431

String[] strs = "hello","stack";

 List<String> list = Arrays.asList( strs );

share|improve this answer

edited Mar 8 at 2:32

answered Mar 8 at 2:24

Common ManCommon Man

2,24031431

answered Mar 8 at 2:24

Common ManCommon Man

2,24031431

answered Mar 8 at 2:24

Common ManCommon Man

2,24031431