Question

我制作了这个方法（interleave），它将3个数组作为输入，然后返回一个数组，该数组按顺序包含每个数组的元素。如果数组中没有元素，那么＆＃34; - ＆＃34;添加到最后一个数组。

示例：如果这些数组被输入方法 - [＆＃34; 1＆＃34 ;;＆＃34; 2＆＃34 ;;＆＃34; 3＆＃34;]，[＆＃34; 4＆＃ 34;]，[＆＃34; 5＆＃34 ;;＆＃34; 6＆＃34;]然后它将返回此数组 -

[＆＃34; 1＆＃34 ;; ＆＃34; 4＆＃34 ;; ＆＃34; 5＆＃34 ;; ＆＃34; 2＆＃34 ;; ＆＃34; - ＆＃34 ;; ＆＃34; 6＆＃34 ;; ＆＃34; 3＆＃34 ;; ＆＃34; - ＆＃34 ;; ＆＃34; - ＆＃34;]

但是，当我打电话给我时，我没有得到任何结果。

static String[] interleave(String[] xs, String[] ys, String[] zs) {


    int length1 = xs.length;
    int length2 = ys.length;
    int length3 = zs.length;
    int larLength = 0;

    if (((length1 > length2) && (length2 > length3) || ((length1 > length3) && (length3 > length2)))) {

        larLength = length1;
    }

    else if (((length2 > length1) && (length1 > length3) || ((length1 > length3) && (length3 > length2)))) {

        larLength = length2;
    }

    else if ((length3 > length2) && (length2 > length1)) {

        larLength = length3;
    }

    String[] result = new String[larLength*larLength];

    for(int i = 0; i < (larLength*larLength - 1); i++) {

        if (xs[i] != null) {result[i] = xs[i];}
        else {result[i] = "-";}
        if (ys[i] != null) {result[i+1] = ys[i];}
        else {result[i+1] = "-";}
        if (zs[i] != null) {result[i+2] = zs[i];}
        else {result[i+2] = "-";}
    }



    return result;

}

Answer 1

您可以使用简单的Math.max(length1,length2,length3)

替换代码的第一部分

这里你真正需要的是数组* larLength

String[] result = new String[3*larLength];

最后，您需要修复在结果数组中添加元素的位置。它不是i，i+1和i+2。

相反，正确的立场是：

第一个职位：resultIndex = i*3，

第二个位置：resultIndex+1

第三位：resultIndex+2

所以你的代码看起来像这样：

String[] result = new String[3*larLength];

for(int i = 0; i < (larLength - 1); i++) {
    int  resultIndex = i*3;
    if (xs[i] != null) {result[resultIndex] = xs[i];}
    else {result[i] = "-";}
    if (ys[i] != null) {result[resultIndex+1] = ys[i];}
    else {result[i+1] = "-";}
    if (zs[i] != null) {result[resultIndex+2] = zs[i];}
    else {result[i+2] = "-";}
}

Answer 2

public class Dummy {

public static void main(String[] args) {
    String xs[] = {"1", "2", "3"}, ys[] = {"4"} , zs[] = {"5", "6"};
    int larLength = Math.max(Math.max(xs.length, ys.length), 
            Math.max(ys.length, zs.length));
    int ind = 0;
    String res[] = new String[3*larLength];
    for (int i=0;i<larLength;i++) {
        if (i<xs.length) res[ind++] = xs[i];
        else res[ind++] = "-";
        if (i<ys.length) res[ind++] = ys[i];
        else res[ind++] = "-";
        if (i<zs.length) res[ind++] = zs[i];
        else res[ind++] = "-";
    }

    for (int i=0;i<res.length;i++) {
        System.out.print(res[i]);
    }
}

为什么这种方法不起作用？

2 个答案: