Java 如何按升序对 ArrayList<Object> 进行排序 android
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How to sort ArrayList<Object> in Ascending order android
提问by Chandru
I have a requirement to sort ArrayList<Object>(Custom objects) in Ascending order based upon name. For that purpose I am using comparator method as like
我需要ArrayList<Object>根据名称按升序对（自定义对象）进行排序。为此，我正在使用比较器方法
My ArrayList :
我的 ArrayList ：
ArrayList<Model> modelList = new ArrayList<Model>();
ArrayList<Model> modelList = new ArrayList<Model>();
Code I am using:
我正在使用的代码：
Comparator<Model> comparator = new Comparator<Model>() {
@Override
public int compare(CarsModel lhs, CarsModel rhs) {
String left = lhs.getName();
String right = rhs.getName();
return left.compareTo(right);
}
};
ArrayList<Model> sortedModel = Collections.sort(modelList,comparator);
//While I try to fetch the sorted ArrayList, I am getting error message
I am completely stuck up and really dont know how to proceed further in order to get sorted list of ArrayList<Object>. Please help me with this. Any help and solutions would be helpful for me. I am posting my exact scenario for your reference. Thanks in advance.
我完全被困住了，真的不知道如何进一步进行以获得ArrayList<Object>. 请帮我解决一下这个。任何帮助和解决方案都会对我有所帮助。我发布了我的确切场景供您参考。提前致谢。
Example:
例子：
ArrayList<Model> modelList = new ArrayList<Model>();
modelList.add(new Model("chandru"));
modelList.add(new Model("mani"));
modelList.add(new Model("vivek"));
modelList.add(new Model("david"));
Normal List:
正常名单：
for(Model mod : modelList){
Log.i("names", mod.getName());
}
Output :
输出 ：
chandru
mani
vivek
david
My requirement after sorting to be like:
排序后我的要求是：
for(Model mod : modelList){
Log.i("names", mod.getName());
}
Output :
输出 ：
chandru
david
mani
vivek
采纳答案by Sahar Avr
Your approach was right. Make your Comparatorinner like in the following example (or you can create a new class instead):
你的做法是对的。Comparator像下面的例子一样制作你的内部（或者你可以创建一个新类）：
ArrayList<Model> modelList = new ArrayList<>();
modelList.add(new Model("chandru"));
modelList.add(new Model("mani"));
modelList.add(new Model("vivek"));
modelList.add(new Model("david"));
Collections.sort(modelList, new Comparator<Model>() {
@Override
public int compare(Model lhs, Model rhs) {
return lhs.getName().compareTo(rhs.getName());
}
});
output:
输出：
chandru
david
mani
vivek
回答by poonam sharma
Collections.sort(actorsList, new Comparator<Actors>() {
@Override
public int compare(Actors lhs, Actors rhs) {
return lhs.getName().compareTo(rhs.getName());
}
});
回答by Ahamadullah Saikat
Collections.sort(modelList, (lhs, rhs) -> lhs.getName().compareTo(rhs.getName()));
