如果想把foreach语句改成for语句，请问该怎么操作？

Question

int[]arr=new int[]{8,2,1,0,3};int[] index=new int[]{2,0,3,2,4,0,1,3,2,3,3};String tel="";for(int i:index){tel+=arr[i];}

Answer 1

double mapScale;
for(int i = 0; i < MOHelper.getInstance().GetLayerConfigs().Count; i++)
{
mapScale += lc.MapScale;
}
------解决方案--------------------
double mapScale;
for(int i= 0 ； i < MOHelper.getInstance().GetLayerConfigs().count ; i++)
{
mapScale = MOHelper.getInstance().GetLayerConfigs()[i].MapScale;
}

Answer 2

//使用for遍历数组for (int i = 0; i < index.length; i++) {    System.out.println("第"+i+"元素是："+index[i]);}