How to randomly change value of string array?

Question

I have made a string array with some names, now I want to change the order of the values and then use a for-loop. my only problem is that I don't know how to change the array values order. here is my code :

This is the array:

people = new ArrayList<>();

people.add("Sam");
people.add("John");
people.add("Kim");
people.add("Edison");

"text" is my textview and "people" is my array with 4 values. I have tried this:

int rando = (int)(Math.random() *4);
for (i=0; i< people.size(); i++) {
text.append(people.get(rando));
}

but it only prints one of the values four times. Like this:

KimKimKimKim

That's because rando never gets a different value other than the one it gets outside the loop. And even if it was set inside the loop (as it should), you will most likely get some duplicate value. Eventualy, all of them. — Phantômaxx
– Phantômaxx, Commented Feb 18, 2019 at 12:16

Samuel Robert · Accepted Answer · 2019-02-18 12:23:22Z

1

You can use Collections.shuffle(people); to get the shuffled names from the arraylist. One line code should do the trick you're looking for

textView.setText(TextUtil.join(",", Collections.shuffle(people));

edited Feb 18, 2019 at 12:23

answered Feb 18, 2019 at 12:18

Samuel Robert

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Kevin Kurien · Accepted Answer · 2019-02-18 12:25:52Z

0

try this.This is how I shuffeled songs in my music player app

for (i=0; i< people.size(); i++) {
shuffleText(people.size())
}
private void shuffleText(int size) {
      int randomNumber = new Random().nextInt((size) + 1) + 1;
      text.append(people.get(randomNumber));
  }

answered Feb 18, 2019 at 12:25

Kevin Kurien

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Valentin · Accepted Answer · 2019-02-18 12:29:08Z

0

You can try this method

public static String getRandom(String[] people) {
   int rnd = new Random().nextInt(people.length);
   return people[rnd];
}

edited Feb 18, 2019 at 12:29

answered Feb 18, 2019 at 12:17

Valentin

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How to randomly change value of string array?

This is the array:

"text" is my textview and "people" is my array with 4 values. I have tried this:

3 Answers 3

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Collectives™ on Stack Overflow

This is the array:

"text" is my textview and "people" is my array with 4 values. I have tried this:

3 Answers 3

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