需要帮助理解这一点，并通过我的代码正确地解释它

Question

程序，该程序有一个方法，该方法以int "Year"作为参数，然后根据参数计算出它是否是闰年。他们给出了一个表格，显示哪些不是闰年，哪些是闰年

2010/4 = no . 1/100 = no ../400 = no ..Leap = no

2012/4 = yes ../100 = no ../400 = no ..Leap = yes

1900/4 = yes ../100 = yes ../400 = no ..Leap = no

2000/4 = yes ../100 = yes ../400 = yes ..Leap = yes

他们还希望该方法确定某一年是否在公历1565年之前

下面是我目前完成的代码。它在某些年份有效，但在另一些年份无效。很明显我做错了什么。如果有人能告诉我我做对了什么，我做错了什么，或者如何最好地去做这件事，我将不胜感激。

public class theleapyear{
  public static void main( String [] args){
    leapyear(2010);
    leapyear(2012);
    leapyear(1900);
    leapyear(2000);
    leapyear(1565);
  }
  public static void leapyear( int year){
    if (year < 1565)
      System.out.println( year + ":" + " predates the Gregorian Calendar ");
    else
    if (year % 4 != 0)
      if (year % 100 != 0)
      if (year % 400 != 0)
    {
      System.out.println( year + ":" + " is not a leap year ");
    }
    else
    {
      if (year % 4 == 0)
        if (year % 100 != 0)
        if (year % 400 != 0)
        System.out.println( year + ":" + " is a leap year ");  
    }
    else
    {
      if (year % 4 == 0)
        if (year % 100 == 0)
        if (year % 400 != 0)
        System.out.println( year + ":" + " is not a leap year ");
    }
    else
    {
      if (year % 4 == 0)
        if (year % 100 == 0)
        if (year % 400 == 0)
        System.out.println( year + ":" + " is a leap year ");
    }
  }
}

Answer 1

你重复了很多代码;尝试使用比较器恢复它。

public class theleapyear{
 public static void main( String [] args){
  leapyear(2010);
  leapyear(2012);
  leapyear(1900);
  leapyear(2000);
  leapyear(1565);
}
public static void leapyear( int year){
if (year < 1565)
  System.out.println( year + ":" + " predates the Gregorian Calendar ");
else
{
if ((year%4 != 0){
      System.out.println(year + ":" + " is not a leap year ");
 }
else {
if((year%100==0 && year%400==0)||(year%100!=0 && year%400!=0){
    System.out.println(year + ":" + " it is a leap year ");
}
else {
   System.out.println(year + ":" + " is not a leap year ");    
 }