菜鸟提问：如何用数组实现任意输入N个数求起平均值？？

Question

如何用数组实现输入N个数，直到输入为负数时候停止输入，然后求这N个数的总和和平均值??

Answer 1

static int i;
 public void actionPerformed(ActionEvent event)                                                                         
                    {                                                                                                   
                        try{                                                                                            
                            int lenth=0;                                                                                
                        int large=Integer.parseInt(jTextField1.getText());                                              
                        if(large<0)                                                              
                        { 
                          count();
                          //算平均数去
                        }                                                                                               
                        else                                                                                            
                        {                                                                                               
                          a[i]=large;
                          i++                                                
                        }                                                                                               
                        }catch(Exception e){                                                                            
                          JOptionPane.showMessageDialog(null,"请输入数字","ERROR",JOptionPane.ERROR_MESSAGE);}        
                      //"请输入数字                                                                      
                    }                                                                                                   
                });                
部分代码 自己再研究下

Answer 2

看到你帖子我就写代码，我也刚初学，写起比较慢~~不知道正确不
Numb.java
//录入n个数，直到为负，求总和和平均数
import java.io.*;
public class Numb {
public static void main(String[] args) {
  double sum=0;      //N个数的总和
      double average=0;  //N个数的平均数  
  double[] number=new double[1000];  //一个足够长的数组
  int index=0;
  //录入N个数
  while(index<=number.length){
  System.out.println ("请输入第"+(index+1)+"个数:");
    try{
         BufferedReader input=new BufferedReader(new InputStreamReader(System.in));
             String inputLine=input.readLine();
         number[index]=Double.valueOf(inputLine).doubleValue();
    }catch(Exception exc){
     System.out.println ("输入数字不合法！");
            continue;
    }
     sum=sum+number[index];
     average=sum/(index+1);
    //如果录入的为负数则停止
    if(number[index]<0)
     break;
     index=index+1;
    }
    System.out.println ("你一共输入了"+(index+1)+"个数");
    System.out.println ("它们的总和是:"+sum);
    System.out.println ("它们的平均数是："+average);
}
}