Java隨機生成6位數字

    public class T {


    /** 
     * 隨機生成 num位數字字符數組 
     *  
     * @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) {  

        // 隨機生成6位數字  
        System.out.println(generateRandomArray(6));  

    }  

}  </pre>