以特定顺序打印阵列

Question

我在按特定顺序打印矢量时遇到一些麻烦。如果有人可以帮助我。感谢。

public static Vector sequence(int length, int start, int step) {

    /* to do
        length 1, start 1, step 1  => [1]
        length 2, start 2, step 2  => [2 4]
        length 3, start 3, step 3  => [3 6 9]
        length 4, start 4, step 4  => [4 8 12 16]
        length 5, start 5, step -1 => [5 4 3 2 1]
    */

    System.out.println(length + ", "+ start+ ", " +step); 
    Vector vector = new Vector(length); 
    for (int i = 0; i < length; i++) { 
        int total = start+step; 
        vector.elements[i] = start+step;
        //System.out.print(vector.elements[i]); 
    }
    //return new Vector(length); 
    return vector; 
}

Answer 1

您需要将step与i相乘，并使用Vector的正确方法添加新元素，即Vector.add()。另外，您最好将类型参数添加到Vector：

Vector<Integer> vector = new Vector<>(length);
for (int i = 0; i < length; i++) { 
    int total = start+step*i; 
    vector.add(total); // add total as last element of the vector
}