Java从键盘接收数据

  package Scanner;

  import java.util.Scanner;
  
  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：");

          //如果...那么
          if(scanner.hasNextInt()){
              i = scanner.nextInt();
              System.out.println("整数数据：" +i);
          }else{
              System.out.println("输入的不是整数数据!" );
          }

          System.out.println("请输入小数：");

          //如果...那么
          if(scanner.hasNextFloat()){
              f = scanner.nextFloat();
              System.out.println("小数数据：" +f);
          }else{
              System.out.println("输入的不是小数数据!");
          }
          scanner.close();
      }
  }

运行结果