java - 如何从列表中删除重复项？

Question

我想从列表中删除重复项，但我的操作不起作用:

List<Customer> listCustomer = new ArrayList<Customer>();    
for (Customer customer: tmpListCustomer)
{
  if (!listCustomer.contains(customer)) 
  {
    listCustomer.add(customer);
  }
 }

Answer 1

假设您想保持当前顺序并且不想要 Set，也许最简单的方法是:

List<Customer> depdupeCustomers =
    new ArrayList<>(new LinkedHashSet<>(customers));

如果要更改原始列表:

Set<Customer> depdupeCustomers = new LinkedHashSet<>(customers);
customers.clear();
customers.addAll(dedupeCustomers);