替换数组中最小数字

public static double[] lowest(double array[],double number){
		if (array == null || array.length == 0)
			return null;
		int j =0 ;
		for(int i=0;i<array.length;i++){
			if(array[j]>array[i])
				j=i;
		}
		array[j] = number;
		return array;
	}