Ideas:

(Recommended tutorial: java introductory tutorial)

Create a Calendar object.

Set the year of the object to the year entered by the keyboard.

Set the month to February 28th.

Add 1 to the number of days, and then determine whether the number of days is 29.

(Video tutorial recommendation: java video tutorial)

Code implementation:

package calendartest;

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

public class Test03 {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);
        while (s.hasNext()) {
            int year = Integer.parseInt(s.nextLine());
            boolean b = isLeapYear(year);
            System.out.println(b);
        }
    }

    // 判斷是否是閏年
    public static boolean isLeapYear(int year) {

        // 創(chuàng)建Calendar對象
        Calendar c = Calendar.getInstance();

        // 將年月日設(shè)置為：year年2月28日，即參數(shù)為year, 1, 28
        c.set(year, 1, 28);

        // 天數(shù)加1
        c.add(Calendar.DAY_OF_MONTH, 1);

        // 是29號，是閏年，否則平年
        return c.get(Calendar.DAY_OF_MONTH) == 29;
    }
}

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