Randomly generated 13 0~51 different random numbers-thought (definition reference system)

/*
* Randomly generated 13 0~51 random numbers without duplicates
* Class:arrayok
*
*/
public class Arrayok
{
public static void Main (String args[])
{
int suit[] = new INT[13]; Store 13 Random Numbers

Boolean sw[] = new boolean[52]; Random numbers exist. is true, otherwise it is false

int key = 0;
for (int i = 0; i < suit.length; i++)
{
while (true)
{
key = (int) (Math.random () *52);
if (Sw[key] = = False) {
Break
}
}
Suit[i] = key;
Sw[key] = true;
}
for (int i = 0; i < suit.length; i++)
{
System.out.print (suit[i]+ "");
}
System.out.print ("\ n");
}
}