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public static ArrayList<Short> RandomArray(int n, short maxVal, short minVal){
        Random r = new Random();
        if(n<=0)
        	return null;
        ArrayList<Short> arrayl = new ArrayList<Short>();
        if(minVal>maxVal)
        	return arrayl;
        for(int i=0;i<n;i++){
        arrayl.add((short) (r.nextInt( maxVal - minVal + 1)  + minVal));
        }
        return arrayl;
    }