Problem:
Java
public class Solution {
public int singleNumber(int[] nums)
{
HashMap<Integer, Integer> map = new HashMap<>();
Integer key = null;
for (int i = 0; i < nums.length; i++)
{
if (!map.containsKey(nums[i]))
{
map.put(nums[i], i);
}
else
{
map.remove(nums[i]);
}
}
Set<Integer> setKey = map.keySet();
Iterator<Integer> iterator = setKey.iterator();
// 从while循环中读取key
while (iterator.hasNext())
{
key = iterator.next();
// 此时的String类型的key就是我们需要的获取的值
}
return key;
}
}
