数组 静态数组 int[] arr={1,2,3}; 动态数组 int arr[]; arr = new int[3]; 或者 int arr[]=new int[3];]

import java.util.Scanner;
public class For02{
    public static void main(String[] args){
    
    //Scanner myScanner = new Scanner(System.in);
    System.out.println("养鸡场鸡的平均体重");
    
    //int num = myScanner.nextInt();
    double []arr ={3,5,1,3.4,2,50};
    int count=arr.length;
    double sum=0,avg=0;
    for(int i =0;i<count;i++){
        sum += arr[i];

    }
    avg = sum/count;
    System.out.println(avg);
    
    
    } //结束主方法
                                          
}