Scanner用法

Scanner

int i = 0;
float f = 0.0F;
Scanner scanner = new Scanner(System.in);
System.out.println("请输入整数：");
if(scanner.hasNextInt()){
    i = scanner.nextInt();
    System.out.println();
}
System.out.println("请输入小数：");
if(scanner.hasNextFloat()){
    f = scanner.nextFloat();
    System.out.println(f);
}
scanner.close();