Javaスキャナとintには年齢が表示されません

Question

年齢を表示するにはどのように誕生年と現在の年を差し引くことができますか？

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); 

Answer 1

使用user_input.nextInt()整数値を読むために、あなたはsubstract文字列ができず、int型：

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) 

Answer 2

また

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