将集合中的某一条数据添加到首位或者最后一位

直接上代码

public static void main(String[] args) {
        List<Customer> addressList = new ArrayList<>();
        Customer c1 = new Customer();
        c1.setId("1");
        c1.setName("ckf");
        addressList.add(c1);

        Customer c2 = new Customer();
        c2.setId("2");
        c2.setName("ycw");
        addressList.add(c2);

        Customer c3 = new Customer();
        c3.setId("3");
        c3.setName("ccc");
        addressList.add(c3);
        //方式一
        for(int i=0; i< addressList.size(); i++){
            String name = addressList.get(i).getName();
            if ("ycw".equals(name)){
                Customer customer = addressList.get(i);
                //把当前循环的元素删除
                addressList.remove(i);
                //把name=ccc的数据添加到集合第0位
                //addressList.add(0, customer);
                //把name=ccc的数据添加到集合的最后一位
                addressList.add(addressList.size(), customer);
            }
        }
        //方式二
        for (Customer customer : addressList) {
            String name = customer.getName();
            if ("ycw".equals(name)){
                //把当前循环的元素删除
                addressList.remove(customer);
                //把name=ccc的数据添加到集合第0位
                addressList.add(0, customer);
            }
        }
        System.out.println(addressList);
    }

 

不懂下方留言 谢谢