Scanner学习2

public class Demo04 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        //从键盘接收数据
        int i = 0;
        float f = 0.0f;

        System.out.println("请输入整数: ");

        if (scanner.hasNextInt()){
            int i1 = scanner.nextInt();

            System.out.println("整数数据:" + i1);

        }else {
            System.out.println("输入的不是整数");
        }

        System.out.println("请输入小数");
        if (scanner.hasNextFloat()){

            Float f2 = scanner.nextFloat();

            System.out.println("小数数据:" + f2);

        }else {
            System.out.println("输入的不是小数");
        }


        scanner.close();
    }
}

public class Demo05 {
    public static void main(String[] args) {
        //我们可以输入多个数字,并非其总和与平均数, 每输入一个数字用回车确认,通过输入非数字来结束输入并输出执行结果

        Scanner scanner = new Scanner(System.in);

        //求和

        double sum = 0;
        //计算输入了多少个数字
        int m = 0;

        //通过循环判断是否还有输入,并在里面对每一次进行求和统计

        while (scanner.hasNextDouble()){
            double x = scanner.nextDouble();

            m = m + 1;
            sum = sum + x;

            System.out.println("你输入了第 " + m  +" 个数据,当前结果为 "+ sum );


        }
        System.out.println(m + "个数的和为" + sum);

        System.out.println(m + "个数的和为" + (sum/m));



        scanner.close();
    }
}