如何在此數組代碼上進行 for 循環？

Question

我的項目包含此代碼以獲取此數組中的圖片鏈接。 我想用 for 循環創建圖像數組。

 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))};

我剛剛嘗試使用此代碼進行 for 循環，但它不允許語法：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

• 創建一個大小為spSize的數組
• 在sP上循環並填充數組

就像是：

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.
}

您的想法很好，但是您不能將循環用作構造函數參數。