java - 如何在此数组代码上进行 for 循环？

Question

我的项目包含此代码以获取此数组中的图片链接。我想用 for 循环创建图像数组。

 private void sliderPic(){
  List<String> sP=catalog_data_list.getCatalogImages();
  String[] urls;
      // Şimdilik bu yöntemle gelen resim sayısına göre dolduruyorum slider'ı.
   int spSize = sP.size();
  if (spSize==2)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1))};
  else if (spSize==1)
      urls = new String[]{String.valueOf(sP.get(0))};
  else if (spSize==3)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2))};
  else if (spSize==4)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2)),
              String.valueOf(sP.get(3))};
  else if (spSize==5)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2)),
              String.valueOf(sP.get(3)), String.valueOf(sP.get(4))};
  else if (spSize==6)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2)),
              String.valueOf(sP.get(3)), String.valueOf(sP.get(4)), String.valueOf(sP.get(5))};
  else if (spSize==7)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2)),
              String.valueOf(sP.get(3)), String.valueOf(sP.get(4)), String.valueOf(sP.get(5)), String.valueOf(sP.get(6))};
  else if (spSize==8)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2)),
              String.valueOf(sP.get(3)), String.valueOf(sP.get(4)), String.valueOf(sP.get(5)), String.valueOf(sP.get(6)),
              String.valueOf(sP.get(7))};
  else if (spSize==9)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2)),
              String.valueOf(sP.get(3)), String.valueOf(sP.get(4)), String.valueOf(sP.get(5)), String.valueOf(sP.get(6)),
              String.valueOf(sP.get(7)), String.valueOf(sP.get(8))};
  else if (spSize==10)
      urls = new String[]{String.valueOf(sP.get(0)), String.valueOf(sP.get(1)), String.valueOf(sP.get(2)),
              String.valueOf(sP.get(3)), String.valueOf(sP.get(4)), String.valueOf(sP.get(5)), String.valueOf(sP.get(6)),
              String.valueOf(sP.get(7)), String.valueOf(sP.get(8)), String.valueOf(sP.get(9))};

我刚刚尝试使用此代码来创建 for 循环，但它不允许使用语法: if (spSize==2)

      urls = new String[]{for (int i=0;i>3;i++){String.valueOf(sP.get(0)), String.valueOf(sP.get(1))};}

Answer 1

• 创建一个大小为 spSize 的数组
• 循环 sP 并填充数组

类似于:

urls = new String[spSize];
for (int i=0; i<spSize; i++) {
    urls[i] = sP.get(i) // already a String, no need to call String.valueOf except if sP can contains null values.
}

你的想法很好，但是你不能使用循环作为构造函数参数。