[Java] 자바 랜덤 넘버 생성/Math.random()

랜덤 넘버 생성

//1~10
int rNum = (int)(Math.random() * 10) +1;

//10 20 30 40 50
int rNum = ((int)(Math.random()*5 +1)*10;

//23 24 36 51 23
int array[] = {23, 24, 36, 51, 23};
int rNum = (int)(Math.random()*5);
unt rNum = array[rNum];

//-1 0 1
int rNum = (int)(Math.random() * 3) -1;