Question

for (int i = 0; i < 15; i+=3) {
        System.out.print("Enter Exam Mark:");
        Marks[i] = input.nextInt();
        System.out.print("Enter Coursework Mark:");
        Marks[i+1] = input.nextInt();
        System.out.print("Enter Weighting:");
        Marks[i+2] = input.nextInt();

    }


public double[] computemarks(int[] Marks) {

    double[] marks = new double[6];
    double computedmark;

    for (int x = 0; x < 15; x+=3) {

        if (Marks[x] >= 35 && Marks[x+1] >= 35) {

            computedmark = ((Marks[x+1] * Marks[x+2]) + (Marks[x] * (100.0 - Marks[x+2]))) / 100.0;

        } else {

            computedmark = Math.min(Marks[x], Marks[x+1]);

        }

        marks[x] = computedmark;

    }
    return marks;

}

为什么在运行时显示“ArrayIndexOutOfBoundsException”？我玩过for循环，但它仍然没有用。

仅供参考，Marks阵列在内存中有18个可用插槽。

Answer 1

您的marks数组在computemarks方法中的大小为6，但是您使用x index设置它，在此处：

marks[x] = computedmark;

取出循环，第3次迭代后等于9。

更新根据您的评论，可以像：

int idx = 0; //here is additional index declared
for(int x=0; x < 15; x+=3) {

    if (Marks[x] >= 35 && Marks[x+1] >= 35) {

        computedmark = ((Marks[x+1] * Marks[x+2]) + (Marks[x] * (100.0 - Marks[x+2]))) / 100.0;

    } else {

        computedmark = Math.min(Marks[x], Marks[x+1]);

    }

    marks[idx++] = computedmark; //here is additional index is used with post incrementing

}
return marks;

ArrayIndexOutOfBoundsException错误显示

1 个答案: