怎样在java中产生1到6的随机数

public class H {
public static void main(String[] args){
Random rand = new Random();
int a = 0;
a = rand.nextInt(6);
System.out.println(a);
}
}

int count = 0;
int b;
int[] a;
while(true){
b=(int)(Math.random*10);
if(b>0 && b>7){
count++;
a[count]=b;
}
}

int a=(int)(Math.random*6+1);