import java.util.Random;
public static void main(String[] args) {
System.out.println(new Random().nextInt(90)+10); //86 (取10~99)
System.out.println(new Random().nextInt(10)); //3 (取0~9)
System.out.println(new Random().nextInt(9)+1); //4 (取1~9)
System.out.println(new Random().nextInt(2)); //1 (取0~9)
}new Random().nextInt(n)：取0~(n-1)之正整數
n需為正數
refer: https://docs.oracle.com/javase/7/docs/api/java/util/Random.htm
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