如何从字符串数组中获取随机字符串？

Question

I got a String[] from which I want to get a random value. I try to put that logic in another method. This is my code so far.

public static void main(String[]args) {
   String [] S = {"aaa", "bbb", "ccc", "ddd", "eee","ggg", "hhh", "iii", "kkk"};
}

public String get () {
    int i;

    for(i = 0; i <= 4; i++) {

    }
}

I need random strings out of array S with the method get() , but I really don't know how to do it.

Answer 1

First you'll have to move the S array to be an instance variable or a static variable, because currently it's local to your main method, and can't be accessed from your get method.

Then you can get a random String this way :

private Random rnd = new Random();
public String get ()
{
   return S[rnd.nextInt(S.length)];
}

Answer 2

You can use java.util.Random to generate random things. However, keep in mind that, it is not secure, not really random.

You can get random char s from the array S :

String randomString = ""; 
Random rand = new Random();
for(int i=0;i<=4;i++)
{
    randomString += S[rand.nextInt(S.length())].charAt(0);
}

System.out.println(randomString);

Answer 3

you do not need loop in get() method you need to generate a random number below the length of the original array and say return S[RANDOM_NUMBER]

EDIT

let the get method takes a parameter of String[]