交換相鄰元素按2分組[1,2,3,4,5,6] = [2,1,4,3,6,5]

Question

public static void swap(int [] array) { 
    for (int i = 0; i < array.length-1; i++) { 
     int temp = array[i+1]; 
     array[i+1] = array[i]; 
     array[i]=temp; 
    } 
} 

我想交換每個相鄰元素兩個。此代碼爲我提供[2, 3, 4, 5, 6, 1]而不是[2, 1, 4, 3, 6, 5]。

Answer 1

只需加2，因爲你基本上是要交換所有其他對連續元素：

for (int i = 0; i < array.length-1; i += 2) { 
            ^