你能帮我解决这个问题吗?
我正在尝试比较(n)个数字对象列表中的字段。
为了更清楚,这是一个例子。
ArrayList<TestObjectType> listOfObjects = new ArrayList<TestObjectType>();
TestObjectType itemA = new TestObjectType();
itemA.setID(1);
TestObjectType itemB = new TestObjectType();
itemA.setID(2);
TestObjectType itemC = new TestObjectType();
itemA.setID(3);
//do compare here
if (2 == listOfObjects.size())
{ TestObjectType itemA = listOfObjects.get(0);
TestObjectType itemB = listOfObjects.get(1);
if (itemA.getID != itemB.getID)
{ //do something here
;
}
}
else if (3 == listOfObjects.size())
{ TestObjectType itemA = listOfObjects.get(0);
TestObjectType itemB = listOfObjects.get(1);
TestObjectType itemC = listOfObjects.get(2);
if ((itemA.getID != itemB.getID) ||
(itemA.getID != itemC.getID) ||
(itemB.getID != itemC.getID))
{ //do something here
;
}
}
// so on and so forth until all (n) number of objects has been compared
问题是,我怎样才能满足迭代列表中任意(n)个对象的数量?
答案 0 :(得分:1)
看起来你想要的是比较List中的所有元素对,并且如果至少有一对具有不同的ID,则执行一些操作:
boolean found = false;
for (int i = 0; i < listOfObjects.size() && !found; i++) {
for (int j = i+1; j < listOfObjects.size() && !found; j++) {
if (listOfObjects.get(i).getID != listOfObjects.get(j).getID)
found = true;
}
}
if (found) {
// do something
}