Scanner

 public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入您的姓名");
        String name = scanner.nextLine();

        System.out.println("请输入您的年龄");
        int age = scanner.nextInt();


        System.out.println("请输入您的工资");
        Double aDouble = scanner.nextDouble();

        scanner.close();//关闭

        System.out.println("----------------------------------");
        System.out.println("姓名:"+name);
        System.out.println("姓名:"+age);
        System.out.println("姓名:"+aDouble);
    }

请输入您的姓名
ssss
请输入您的年龄
44
请输入您的工资
4141414.4
----------------------------------
姓名:ssss
姓名:44
姓名:4141414.4

Process finished with exit code 0

public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入年份");
        int year = scanner.nextInt();

        scanner.close();
        
        if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
            System.out.println("闰年");
        } else {
            System.out.println("不是闰年");
        }

        System.out.println("----------------------------------");

        Boolean yers = (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
        String le=yers ? "闰年":"不是闰年";
        System.out.println(le);


    }

请输入年份
4000
闰年
----------------------------------
闰年

  public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入您购买商品的价格是多少");
        Double money=scanner.nextDouble();
        scanner.close();

        if (money>500){
            double v = money * 0.09;
            double ll=money-v;
            System.out.println("您的实际付款金额是==>"+ll);
        }else {
            System.out.println("您的实际付款金额是==>"+money);
        }


    }

请输入您购买商品的价格是多少
277
您的实际付款金额是277.0