如何对 ArrayList<Object> 进行排序按升序排列 android [英] How to sort ArrayList<Object> in Ascending order android
问题描述
我需要根据名称按升序对 ArrayList(自定义对象)进行排序.为此，我正在使用比较器方法
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
我的数组列表:
ArrayList
我使用的代码:
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
我完全被困住了，真的不知道如何进一步进行以获得ArrayList的排序列表.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.
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.
示例:
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"));
普通列表:
for(Model mod : modelList){
Log.i("names", mod.getName());
}
输出:
chandru
mani
vivek
david
排序后我的要求是:
for(Model mod : modelList){
Log.i("names", mod.getName());
}
输出:
chandru
david
mani
vivek
推荐答案
你的方法是对的.使你的 Comparator 像下面的例子一样内部(或者你可以创建一个新类):
Your approach was right. Make your Comparator inner like in the following example (or you can create a new class instead):
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());
}
});
输出:
chandru
david
mani
vivek
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