How java print a string value from a list?

Question

How can I print a string value from a list in java?

I have an array with more four strings. I want to print one of the value from the list randomly.

I tried this :

import java.util.Arrays;
import java.util.List;
import java.util.Random;

class Text {

    public static void main(String [] args) {

        String [] array = {"hello", "world", "coucou"};
        List <String> list = Arrays.asList(array);
        {
            System.out.println("String from the list ="+Random.array);
        }
    }
}

Can someone help resolve the syntax for System.out.println?

Thank you.

possible duplicate of [Retrieving a random item from ArrayList](http://stackoverflow.com/questions/5034370/retrieving-a-random-item-from-arraylist) — NESPowerGlove, Feb 13 '15 at 20:18

rageandqq · Accepted Answer · 2015-02-14T17:51:33.477

2

You can use the Random class to generate a random number between 0 (inclusive) and your list's length (exclusive), and print the value at that index.

Random rand = new Random();
System.out.println("String from list: " + list.get(rand.nextInt(list.size()));

edited Feb 14 '15 at 17:51

answered Feb 13 '15 at 20:18

rageandqq

2,221
18
24

score 0 · Answer 2 · answered Feb 13 '15 at 20:18

0

Before selecting the random element you can create a random number from range [0, n) where n is the size of the list.

You can use new Random(System.nanoTime()).nextInt(list.size()) to do it.

answered Feb 13 '15 at 20:18

MateuszPrzybyla

897
8
17

score 0 · Answer 3 · answered Feb 13 '15 at 20:48

 public class ListExample {

    public static void main(String[] args) {



          String [] array = {"hello", "world", "coucou"};

         ArrayList <String> list=new ArrayList<String>();


         for(int i=0;i<array.length;i++){
             list.add(array[i]);
         }

        Random rnd=new Random();


        System.out.println("String from the list ="+list.get(rnd.nextInt(array.length)));

        }


}

How java print a string value from a list?

3 Answers3