小编eli*_*eli的帖子

import java.util.Random;
import java.util.Scanner;
public class ArrayPractice {
public static void main(String[] arg) {
    long input;
    System.out.println("How Many Times will you roll?");
    Random random=new Random();     
    Scanner scan=new Scanner(System.in);
    input=scan.nextLong();
    long freq[]=new long[7];
    for(long i=1;i<input;i++){
        //1+random.nextInt(6)-numbers 1-6
        ++freq[1+random.nextLong(6)];
    }
    System.out.println("Face\tFrequency");
    for(long i=1;i<freq.length;i++){
        System.out.println(i+"\t"+freq[i]);
    }
}
}

为什么我的程序说他们将++freq[1+random.nextLong(6)]; and freq[i]我的所有值转换为long 是不匹配的.为什么他们会不匹配？

我明白如何ViewHolder的onBindViewHolder作品,但我不清楚如何notifyItemRangeChanged(0, this.data.size());在这个例子中它到底是什么工程和.

提供给此适配器的数据采用Json格式.

适配器如下:

 public class AdapterQuestion extends RecyclerView.Adapter<AdapterQuestion.ViewQuestion>{

     private LayoutInflater mLayoutInflater;

     //this is an arrayList of questionData objects
     private ArrayList<QuestionData> data =new ArrayList<>();

     //Created the layoutInflator
     public AdapterQuestion(Context context){
          //get from context
          mLayoutInflater=LayoutInflater.from(context);
     }

     public void setBloglist(ArrayList<QuestionData> data){
         this.data =data;
         notifyItemRangeChanged(0, this.data.size());
     }

     @Override
     public ViewQuestion onCreateViewHolder(ViewGroup parent, int viewType) {
         //inflates the customQuestion view or converts it to java code
         View view= mLayoutInflater.inflate(R.layout.customquestion, null);

        //We now want to convert the View into …