因此,我需要返回某个行程的出发点,以下是一些示例:
Trips:= [[[A,B],[B,C],[C,D]] 在此示例中,行程从“ A”开始。
Trips:= [[[D,E],[F,D],[E,X]] 在此示例中,行程从“ F”开始。
为此,我进行了2次循环以将A与C和D进行比较,如果A不存在,则它是出发点。
是否可以通过这种方式(保持2个循环)并更改条件以仅获取出发城市?
ArrayList<ArrayList> tripsList = new ArrayList<ArrayList>();
ArrayList<String> trip1 = new ArrayList<String>();
ArrayList<String> trip2 = new ArrayList<String>();
ArrayList<String> trip3 = new ArrayList<String>();
tripsList.add(trip1);
tripsList.add(trip2);
tripsList.add(trip3);
trip1.add("Hamburg");
trip1.add("Berlin");
trip2.add("Mainz");
trip2.add("Frankfurt");
trip3.add("Frankfurt");
trip3.add("Hamburg");
System.out.println(tripsList);
for (int i=0; i < 3 ; i++)
{
for (int j=0; j < 3 ; j++)
{
if (tripsList.get(i).get(0)!=tripsList.get(j).get(1))
System.out.println("your place is "+tripsList.get(i).get(0));
}
}`
输出如下:
[[Hamburg, Berlin], [Mainz, Frankfurt], [Frankfurt, Hamburg]]
your place is Hamburg
your place is Hamburg
your place is Mainz
your place is Mainz
your place is Mainz
your place is Frankfurt
your place is Frankfurt
答案 0 :(得分:0)
使用标志来等待,直到您检查所有结果:
Boolean anyMatches = False;
For (int i= 0; i < 3 ; i++)
{
anyMatches = false;
For (int j= 0; j < 3 ; j++)
{
If (tripsList.get(i).get(0) == tripsList.get(j).get(1))
{
anyMatches = true;
}
}
If (anyMatches == False)
{
SystemThen.out.println("Your Departure City is "+tripsList.Get(i).Get(0));
}
}
答案 1 :(得分:0)
一旦发现出发方法停止搜索,希望它能为您提供帮助
ArrayList<ArrayList<String>> tripsList = new ArrayList<>();
ArrayList<String> trip1 = new ArrayList<String>();
ArrayList<String> trip2 = new ArrayList<String>();
ArrayList<String> trip3 = new ArrayList<String>();
tripsList.add(trip1);
tripsList.add(trip2);
tripsList.add(trip3);
trip1.add("D");
trip1.add("E");
trip2.add("F");
trip2.add("D");
trip3.add("E");
trip3.add("X");
System.out.println(tripsList);
String departure = "";
for (int i = 0; i < tripsList.size(); i++) {
if (!departure.equals("")) {
break;
}
departure = tripsList.get(i).get(0);
for (int j = 0; j < tripsList.size(); j++) {
if ( j == i) {
continue;
}
if (departure.equals(tripsList.get(j).get(1))) {
departure = "";
break;
}
}
}
System.out.println(departure);