删除list中重复的对象

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();
	}
}

评论

1 楼 yadsun 2010-01-15  

我喜欢用Set来过滤重复的对象，不知道效率会不会很低