Java随机生成6位数字

public class T {

/**
* 随机生成 num位数字字符数组
*
* @param num
* @return
*/
public static char[] generateRandomArray(int num) {
String chars = "0123456789";
char[] rands = new char[num];
for (int i = 0; i < num; i++) {
int rand = (int) (Math.random() * 10);
rands[i] = chars.charAt(rand);
}
return rands;
}

public static void main(String[] args) {

// 随机生成6位数字
System.out.println(generateRandomArray(6));

}

}