删除list中重复的对象

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package test.com;
import java.text.SimpleDateFormat;
import java.util.*;
public class Test {
public static void main(String[] args) {
List<Account> list = new ArrayList<Account>();
Calendar c = Calendar.getInstance();
c.add(Calendar.SECOND, 1);
Date date = c.getTime();
Account account1 = new Account(1, Test.getFormat(date));
c.add(Calendar.HOUR, 1);
date = c.getTime();
list.add(account1);
list.add(account1);
Account account2 = new Account(2, Test.getFormat(date));
c.add(Calendar.HOUR, 1);
date = c.getTime();
list.add(account2);
list.add(account2);
Account account3 = new Account(3, Test.getFormat(date));
c.add(Calendar.HOUR, 1);
date = c.getTime();
list.add(account3);
list.add(account3);
Account account4 = new Account(4, Test.getFormat(date));
c.add(Calendar.HOUR, 1);
date = c.getTime();
list.add(account4);
list.add(account4);
Iterator it = list.iterator();
if (list != null && list.size() != 0) {
HashMap map = new HashMap();
while (it.hasNext()) {
Account account = (Account) it.next();
Account accountmap = (Account) map
.get(account.getAccounttype());
if (accountmap == null) {
map.put(account.getAccounttype(), account);
} else {
it.remove();
}
}
}
it = list.iterator();
while (it.hasNext()) {
System.out.println(it.next());
}
}
public static String getFormat(Date date) {
SimpleDateFormat dataFormat = new SimpleDateFormat("yyyyMMddHHmmss");
return dataFormat.format(date);
}
}
class Account {
private int accounttype;
private String applyTime;
public Account(int accounttype, String applyTime) {
this.accounttype = accounttype;
this.applyTime = applyTime;
}
public int getAccounttype() {
return accounttype;
}
public void setAccounttype(int accounttype) {
this.accounttype = accounttype;
}
public String getApplyTime() {
return applyTime;
}
public void setApplyTime(String applyTime) {
this.applyTime = applyTime;
}
public String toString() {
return this.getApplyTime() + this.getAccounttype();
}
}