高分求解JAVA疑难,希望能得到解答

Question

public Flight findFlight(String num) {
    for (int i=0;i<flightList.size();i++)
        if (flightList.get(i).getFlightnum().equals(num)) {
            return flightList.get(i);
        }
    return null;
}

/*
 * public boolean addFlight - passing in a parameter of type flight, adds
 * the parameter into the arraylist. allFlights arraylist. If so, returns
 * that flight object from the arraylist, otherwise, it should return null.
 */
public boolean addFlight(Flight flight1) {
    Flight findFlightStatus = this.findFlight(flight1.getFlightnum());
    if (findFlightStatus == null) {
        flightList.add(flight1);
        return true;
    } else
        System.out.println(
                "Cannot be added to the schedule, because there is another flight with the same flight number.");
    return false;

}

这两段代码,当我在main方法使用addFlight在flightlist里增加元素的时候,第一个元素总是能正确添加,但是第二个元素开始,便不断提示"Cannot be added to the schedule, because there is another flight with the same flight number."这一句.即便我的flightnum确实不一样的,为什么呢?

Answer 1

别的我们不谈 你这findflight方法就有问题 你集合查询永远都是查第一次而且查询的是第一个元素 建议你初学不要省略括号 if else括号内容要分清！