日撸java三百行第四天

科技前沿 • 2025-02-17 10:54 • 阅读 71

大家好，我是讯享网，很高兴认识大家。

日撸java三百行（总述）

4.1 if 语句的嵌套.
4.2 基本规律自行百度.
4.3 布尔类型.

package test; public class Day4 { public static void main(String args[]) { //Test isLeapYear int tempYear = 2021; System.out.print("" + tempYear + " is"); if(!isLeapYear(tempYear)) { System.out.print(" NOT"); }//Of if System.out.println(" a leap year."); tempYear = 2000; System.out.print("" + tempYear + " is"); if(!isLeapYear(tempYear)) { System.out.print(" NOT"); }//Of if System.out.println(" a leap year."); tempYear = 2100; System.out.print("" + tempYear + " is"); if(!isLeapYear(tempYear)) { System.out.print(" NOT"); }//OF if System.out.println(" a leap year."); tempYear = 2004; System.out.print("" + tempYear + " is"); if(!isLeapYear(tempYear)) { System.out.print(" NOT"); }//Of if System.out.println(" a leap year."); //Test isLeapYearV2 System.out.println("Now use the second version"); tempYear = 2021; System.out.print("" + tempYear + " is"); if(!isLeapYearV2(tempYear)) { System.out.print(" NOT"); }//Of if System.out.println(" a leap year."); tempYear = 2000; System.out.print("" + tempYear + " is"); if(!isLeapYearV2(tempYear)) { System.out.print(" NOT"); }// Of it System.out.println(" a leap year." ); tempYear = 2100; System.out.print("" + tempYear + " is"); if (!isLeapYearV2(tempYear)) { System.out.print(" NOT"); } // Of if System.out.println(" a leap year."); tempYear = 2004; System.out.print("" + tempYear + " is"); if (!isLeapYearV2(tempYear)) { System.out.print(" NOT"); } // Of if System.out.println(" a leap year."); }//Of main / * * Is the given year leap? * * @param paraYear The given year. * */ public static boolean isLeapYear(int paraYear) { if((paraYear % 4 ==0)&&(paraYear % 100 != 0)||(paraYear % 400 == 0)) { return true; }else { return false; }// Of if } / * * Is the given year leap? Replace the complex condition with a number of if. * * @param paraYear The given year. * */ public static boolean isLeapYearV2(int paraYear) { 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 }// Of class LeapYear

讯享网

两种求闰年方法

讯享网public static boolean isLeapYear(int paraYear) { if((paraYear % 4 ==0)&&(paraYear % 100 != 0)||(paraYear % 400 == 0)) { return true; }else { return false; }// Of if }

public static boolean isLeapYearV2(int paraYear) { 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

和第三天差不多

Java对逻辑值有一个布尔类型 true或者false，这是所有关系运算符返回的类型他们不转换为任何数字表示。

Java中的真正字面值不等于1，false字面值也不等于0.在Java中，它们只能分配给声明为boolean的变量。

日撸java三百行第四天

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