java - for循环中的后缀和前缀

Question

我遇到了这些用于排序的示例，我对这里的后缀和前缀感到很困惑——为什么最后使用了——但这里使用了++currIndex？在第二个例子中它只使用了++pass 和++index？这些在排序中重要吗？非常感谢!

for (int last = n-1; last >= 1; last--) {
    int largest = indexOfLargest(theArray, last+1);
     int temp = theArray[largest]; 
     swap theArray[largest] = theArray[last]; 
     theArray[last] = temp;
 }

 private static int indexOfLargest(int[] theArray, int size) { 
     int indexSoFar = 0;
     for (int currIndex = 1; currIndex < size; ++currIndex) {
        if (theArray[currIndex]>theArray[indexSoFar])
           indexSoFar = currIndex;
      }
  return indexSoFar;

示例 2:

for (int pass = 1; (pass < n) && !sorted; ++pass) {
     sorted = true; 
       for (int index = 0; index < n-pass; ++index) {
           int nextIndex = index + 1;
           if (theArray[index]>theArray[nextIndex]) {
               int temp = theArray[index];
               theArray[index] = theArray[nextIndex];
               theArray[nextIndex] = temp;
 }

Answer 1

简单来说，不影响排序。这是您关于如何执行递增/递减的合乎逻辑的决定

例如

int i = 0;

while (something) {  //any loop for/while
    array[++i] = some data; //increment i first and then next do operation
}

is similar to 

int i = 1;
while (something) {
    array[i++] = some data; //do operation and then increment
}

但重要的区别是++i先执行，然后根据i执行你想执行的操作。另一种情况是先对 i 进行运算，再进行自增