编写一个Java程序，求整型数组的加权平均值

以下是一个Java程序，可以求整型数组的加权平均值：

public class WeightedAverage {
    public static void main(String[] args) {
        int[] array = {1, 2, 3};
        int[] weights = {4, 5, 6};
        double weightedAverage = calculateWeightedAverage(array, weights);
        System.out.println("The weighted average is " + weightedAverage);
    }

    public static double calculateWeightedAverage(int[] array, int[] weights) {
        if (array.length != weights.length) {
            throw new IllegalArgumentException("The length of the array and weights should be the same");
        }
        int sum = 0;
        int totalWeight = 0;
        for (int i = 0; i < array.length; i++) {
            sum += array[i] * weights[i];
            totalWeight += weights[i];
        }
        return (double) sum / totalWeight;
    }
}

该程序接受两个整型数组，一个是要求加权平均值的整型数组，另一个是对应权值的整型数组。程序会先检查两个数组的长度是否相等，若不相等则抛出异常。接着，程序通过一个循环计算加权平均值，并返回结果。