正如上面有人回答的那样:

如果你以后想使用这个变量，最好使用:

int year;

year = Calendar.getInstance().get(Calendar.YEAR);

如果你只需要一个年份，你最好使用:

Calendar.getInstance().get(Calendar.YEAR)

例如，在do中使用它，而检查引入的年份不小于当前年份200或大于当前年份(可能是出生年份):

import java.util.Calendar;
import java.util.Scanner;

public static void main (String[] args){

    Scanner scannernumber = new Scanner(System.in);
    int year;

    /*Checks that the year is not higher than the current year, and not less than the current year - 200 years.*/

    do{
        System.out.print("Year (Between "+((Calendar.getInstance().get(Calendar.YEAR))-200)+" and "+Calendar.getInstance().get(Calendar.YEAR)+") : ");
        year = scannernumber.nextInt();
    }while(year < ((Calendar.getInstance().get(Calendar.YEAR))-200) || year > Calendar.getInstance().get(Calendar.YEAR));
}

Java 8及以上版本:

int year = Year.now().getValue();

对于较旧版本的Java:

int year = Calendar.getInstance().get(Calendar.YEAR);

我使用我的库中的特殊函数来处理日/月/年int -

int[] int_dmy( long timestamp ) // remember month is [0..11] !!!
{
  Calendar cal = new GregorianCalendar(); cal.setTimeInMillis( timestamp );
  return new int[] { 
    cal.get( Calendar.DATE ), cal.get( Calendar.MONTH ), cal.get( Calendar.YEAR )
  };
};


int[] int_dmy( Date d ) { 
 ...
}

正如上面有人回答的那样:

如果你以后想使用这个变量，最好使用:

int year;

year = Calendar.getInstance().get(Calendar.YEAR);

如果你只需要一个年份，你最好使用:

Calendar.getInstance().get(Calendar.YEAR)

例如，在do中使用它，而检查引入的年份不小于当前年份200或大于当前年份(可能是出生年份):

import java.util.Calendar;
import java.util.Scanner;

public static void main (String[] args){

    Scanner scannernumber = new Scanner(System.in);
    int year;

    /*Checks that the year is not higher than the current year, and not less than the current year - 200 years.*/

    do{
        System.out.print("Year (Between "+((Calendar.getInstance().get(Calendar.YEAR))-200)+" and "+Calendar.getInstance().get(Calendar.YEAR)+") : ");
        year = scannernumber.nextInt();
    }while(year < ((Calendar.getInstance().get(Calendar.YEAR))-200) || year > Calendar.getInstance().get(Calendar.YEAR));
}

你也可以使用Java 8的LocalDate:

import java.time.LocalDate;
//...
int year = LocalDate.now().getYear();

如果你想要任何日期对象的年份，我使用以下方法:

public static int getYearFromDate(Date date) {
    int result = -1;
    if (date != null) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        result = cal.get(Calendar.YEAR);
    }
    return result;
}