Question

在我的一个构造函数中，我有：

public Author(String firstName, String lastName, String middleName, int yearBorn, 
    int monthBorn, int dayBorn, int yearDied, int monthDied, int dayDied,
    String pseudonymFirstName, String pseudonymLastName, String pseudonymMiddleName ){
        name = new Name(firstName,lastName,middleName);
        born = new Date(yearBorn, monthBorn, dayBorn);
        died = new Date(yearDied, monthDied, dayDied);  

 if((pseudonymFirstName == null) && (pseudonymLastName == null) && (pseudonymMiddleName == null)){
            pseudonym = null;
        }else{
            pseudonym = new Name(pseudonymFirstName,pseudonymLastName,pseudonymMiddleName);
        }

    }

此构造函数调用其他类中的方法来存储Author类的值。

现在我想制作一个方法，从yearBorn中减去current year的值，给我一个作者的年龄

到目前为止，我的方法看起来像：

public int getAgeYearsOfAuthor(){

        return CURRENT_YEAR - (WHAT DO I PUT HERE?????);

}

如何在构造函数中提取yearBorn值（这是一个int）形式：born = new Date(yearBorn, monthBorn, dayBorn);？

Answer 1

你可以试试这个方法

public int getAgeYearsOfAuthor(){
  return CURRENT_YEAR -(born.getYear)
}

但要小心，如果你使用JAVA中的日期它是构造函数，当你设置年份它将为你的变量添加1900

Answer 2

试试这个：

LocalDate now = new LocalDate();
Years age = Years.yearsBetween(born, now);

See the original answer here

确保您的born Date是正确的LocalDate()

Answer 3

在java8中你可以这样做：

final LocalDate now = LocalDate.now();
final LocalDate birt = LocalDate.of(1980, Month.DECEMBER, 10);
final Period p = Period.between(birt, now);
System.out.println("You are " + p.getYears() + " years old.");

需要使用外部方法的构造函数的值

3 个答案: