java初学--读入输出

import java.util.Scanner;
public class aver 
{

	public static void main(String args[])
	{
		System.out.print("How many numbers will be entered:");
		Scanner input=new Scanner(System.in);//先定义
		int count =input.nextInt();//整数
		double count1 = input.nextDouble();//实数
		String count2=input.next();//字符
		String line = input.nextLine();
		double ans=0;
		
		for(int i=0;i<count;i++)
		{
			System.out.print("Enter number:");
			double x=input.nextDouble();
			ans+=x;
		}
		ans/=count;
		System.out.print(ans);
		System.out.println("    "+ans);
		System.out.printf("%f\n",count1);
		System.out.println(line);
		System.out.print(count2);
	}
	
}