Java scanner和int不显示年龄

How can I subtract the birth year and current year to display age?

如何减去出生年份和当前年份以显示年龄?

    Scanner user_input = new Scanner(System.in);
    String birth_year;

    System.out.print("Enter your the year you were born: ");
    birth_year = user_input.next();

    int age, current_year = 2016;
    age = current_year - birth_year;

    System.out.println("Your age is "+age);

2 个解决方案

#1

Use user_input.nextInt() to read integer values, you can't substract String and int:

使用user_input.nextInt()读取整数值,不能减去String和int:

Scanner user_input = new Scanner(System.in);
int birth_year;

System.out.print("Enter your the year you were born: ");
birth_year = user_input.nextInt();

int age, current_year = 2016;
age = current_year - birth_year;

System.out.println("Your age is "+age)

#2

You can use something like this also

你也可以使用这样的东西

    LocalDate birthdate = LocalDate.of(YEAR, MONTH, DAY);
    LocalDate now = LocalDate.now();
    int age = Period.between(birthdate, now).getYears();

#1