How to get a 50/50 chance in random generator

Question

I am trying to get a 50/50 chance of get either 1 or 2 in a random generator.

For example:

Random random = new Random(); int num = random.nextInt(2)+1; 

This code will output either a 1 or 2.

Let's say I run it in a loop:

for ( int i = 0; i < 100; i++ ) {     int num = random.nextInt(2)+1 ; } 

How can I make the generator make an equal number for 1 and 2 in this case?

So I want this loop to generate 50 times of number 1 and 50 times of number 2.

Answer 1

One way: fill an ArrayList<Integer> with fifty 1's and fifty 2's and then call Collection.shuffle(...) on it.