day4
总结：
1、闰年的判断逻辑本身很简单 %4==0&&%100!=0。
2、boolean类型只有两个值：true、false。
package day4;
public class text1 {
public static void main(String args[])
{
int year =2022;
System.out.print("" + year + " is ");
if(!isleapyear(year))
{
System.out.println("NOT .");
}
else
{
System.out.println("a leap year.");
}
year=2000;
System.out.print("" + year + " is ");
if(!isleapyear(year))
{
System.out.print("NOT .");
}
else
{
System.out.println("a leap year.");
}
year=2004;
System.out.print("" + year + " is ");
if(!isleapyear(year))
{
System.out.print("NOT .");
}
else
{
System.out.println("a leap year.");
}
year=2021;
System.out.print("" + year + " is ");
if(!isleapyear(year))
{
System.out.println("NOT .");
}
else
{
System.out.println("a leap year.");
}
year=2008;
System.out.print("" + year + " is ");
if(!isleapyear(year))
{
System.out.println("NOT .");
}
else
{
System.out.println("a leap year.");
}
}
public static boolean isleapyear(int year) {
if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0)) {
return true;
} else {
return false;
} // Of if
}
}
结果：
