我试图建立一个间隔树。在这一部分中,我必须按升序排列所有左端点,并按升序排列所有右端点,并将它们放置在单点列表中(无重复)。但是,当我尝试将正确的端点合并到点列表中时,总是收到indexOutOfBounds异常。我已确保不会发生这种情况,但是无论如何都会发生这种情况。我在这里不明白什么?
public static ArrayList<Integer> getSortedEndPoints(ArrayList<Interval> leftSortedIntervals, ArrayList<Interval> rightSortedIntervals) {
ArrayList<Integer> result = new ArrayList<Integer>();
for (int i = 0 ; i < leftSortedIntervals.size() ; i++ ) {
if (i >= 1 && leftSortedIntervals.get(i-1).leftEndPoint != leftSortedIntervals.get(i).leftEndPoint ) {
result.add(leftSortedIntervals.get(i).leftEndPoint);
}
else if (i == 0) {
result.add(leftSortedIntervals.get(i).leftEndPoint);
}
}
result.ensureCapacity(rightSortedIntervals.size()*2);
for (int j = 0 ; j < rightSortedIntervals.size(); j++) {
boolean duplicate = false;
int size = result.size()-1;
int temp = rightSortedIntervals.get(j).rightEndPoint;
while (size >= 0 && result.get(size) >= rightSortedIntervals.get(j).rightEndPoint ) {
if (result.get(size) == rightSortedIntervals.get(j).rightEndPoint) {
duplicate = true;
break;
}
else {
result.set(size+1, result.get(size));
size--;
}
}
if (duplicate = true) {
continue;
}
else {
result.add(size, temp);
}
}
return result;
}
该行发生错误:
else {
result.set(size+1, result.get(size));
size--;
}
最佳答案
你有:
int size = result.size() - 1;
// ...
result.set(size + 1, result.get(size));
size--;
因此,错误将每次发生:在第一次迭代中,
size + 1 == result.size()
,因此您无法调用result.set(size+1, anything)
关于java - Arraylist不断抛出IndexOutOfBounds,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15395019/