Java、显示闰年_java写1949年到2020年全部闰年

        编写程序，显示从101到2100期间所有闰年，每行显示10个。数字之间用一个空格字符隔开，同时显示这期间闰年的数目。

package pack2;
 
import java.util.Scanner;
 
public class ShowLeapYears {
 
	public static void main(String[] args) {
		try(Scanner input = new Scanner(System.in);) {
			System.out.print("Enter start year and end year: ");
			showLeapYears(input.nextInt(), input.nextInt());
		}
	}
	
	//显示闰年
	public static void showLeapYears(int start, int end) {
		int sum = 0;
		
		for (int i = start, j = 1; i <= end; i++) 
			if(isLeapYear(i)) {
				System.out.printf("%5d", i);
				if(j++ % 10 == 0) System.out.println();
				sum++;
			}
		System.out.println("\nThe number of leap year from "+start+" to "+end+
                 " has "+sum);
	}
 
	//判定是否为闰年
	public static boolean isLeapYear(int year) {
		if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
			return true;
		return false;
	}
}