It uses scanner to read double numbers from keyboard and display their average. It is assumed that input is terminated by the string “done”.

import  java.util.*;

class AvgNums{

public static void main (String a[]){

Scanner conin = new  Scanner (System.in);

int count =0;

double sum=0.0;

System.out.println("Enter Numbers:: ");

// Read and Sum numbers

while (conin.hasNext() ) {

if(conin.hasNextDouble () ) {

sum += conin.nextDouble();

count++;

}

else {

String str = conin.next();

if(string.equals ("done")) break;

else {

System.out.println("ERROR");

return;

}

}

}

System.out.println("Average is  "+ sum/ count);

}

}