Question

显示从今天起的100天、从你出生之日起的100天和从你出生之日起的10 000天。我已经做了所有这些,但是我想再进一步一点,我希望用户能够输入从今天起他/她希望知道的日期(如果这有意义的话...)的天数。这里的代码im工作部分看起来像:

 public class calendarProjectTest
    {
    public static void main(String[] args)
    { GregorianCalendar cal = new GregorianCalendar(); //declare today s date
    GregorianCalendar myBirthday = new
    GregorianCalendar(1990, GregorianCalendar.JUNE, 9); //declare my birthday
    System.out.println("Please enter a number greater than 0:");
    Scanner keyboard = new Scanner(System.in);
    String number = keyboard.next();
    int value = number;
    cal.add(GregorianCalendar.DAY_OF_MONTH, number);

I m using Bluej and it says, "incompatible types - found java.lang.String but expected int" I m at a loss. i don t have any idea what to do. any advise would be great. and yes, i know there are no end brackets.

Answer 1

更改此更改 :

cal.add(GregorianCalendar.DAY_OF_MONTH, Integer.parseInt(number));

从docs 中可以看到, add() 方法需要两个参数作为 int 。

Answer 2

使用此选项 :

int value = Integer.parseInt(number);

Answer 3

问题就在这里

String number = keyboard.next();
int value = number;

代之以使用:

int value = keyboard.nextInt(); // you will get parsed int value
cal.add(GregorianCalendar.DAY_OF_MONTH, value);

Answer 4

Keyboard.next(); returns a string, not an integer.

sot value = number 正在试图为 int 类型指定字符串值。尝试将此值替换为 : < number >int value = Integer. parseInt( number ) ;

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