JAVA学习（小白向）—计算闰年—2021.5.23_输出21世纪闰年java-优快云博客

这篇博客介绍了如何使用JAVA编程判断闰年的方法，包括两种不同的实现方式。通过示例代码展示了如何检查2021年、2000年和2014年是否为闰年，并探讨了函数的访问权限差异，如public、private和protected。

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JAVA学习（小白向）—计算闰年—2021.5.23

计算闰年

package a4;
/**
 * 
 * @author hengyuzuo
 *
 */

public class a4 {
	/**
	 * The entrance of the program.
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//Test if Leap year
		int tempYear = 2021;
		
		System.out.println(tempYear + " is " );
		if (!isLeapYear(tempYear)) {
			System.out.print("Not ");
		}// Of if
		System.out.println("A leap year.");
		
		tempYear = 2000;
		
		System.out.println(tempYear + " is ");
		if (!isLeapYear(tempYear)) {
			System.out.print("Not ");
		}// Of if
		System.out.println("A leap year.");	
		
		tempYear = 2014;
		
		System.out.println(tempYear + " is ");
		if (!isLeapYear(tempYear)) {
			System.out.print("Not ");
		}// Of if
		System.out.println("A leap year.");
		
		//anther version
		System.out.println("Now use the second version.");
		
		tempYear = 2000;
		
		System.out.print(tempYear + " is ");
		if (!isLeapYearV2(tempYear)) {
			System.out.print("Not ");
		}// Of if
		System.out.print("" + "A leap year.");
		
		tempYear = 2004;
		
		System.out.print(tempYear + " is ");
		if (!isLeapYearV2(tempYear)) {
			System.out.print("Not ");
		}// Of if
		System.out.print("" + "A leap year.");
	}// Of main

	private static boolean isLeapYearV2(int paraYear) {
		// TODO Auto-generated method stub
		if (paraYear % 4 != 0) {
			return false;
		}else if(paraYear % 400 == 0) {
			return true;
		}else if(paraYear % 100 == 0) {
			return false;
		}else {
			return true;
		}// Of if
	}// Of isLeapYearV2

	private static boolean isLeapYear(int paraYear) {
		// TODO Auto-generated method stub
		if((paraYear % 4 == 0) && (paraYear % 100 !=0) || (paraYear % 400 == 0)){
			return true;
		}else {
			return false;
		}// Of if
	}// Of isLeapYear
}// Of class

运行结果

2021 is 
Not A leap year.
2000 is 
A leap year.
2014 is 
Not A leap year.
Now use the second version.
2000 is A leap year.2004 is A leap year.

在定义函数时自动生成private static boolean，比较了一下他们的区别：

public是公用的,其他类都可调用.
private是私有的,是最严格的,只有当前类(当前JAVA文件)可以调用,甚至继承当前类的子类都不能调用.
protected解决了private的子类不能调用的缺陷,可以理解为一个继承系下的可以调用
打个比方: public相当于外人可以调用.private相当于只家庭内可以调用,protected相当于亲戚可以调用.