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  • Java8新特性
    Java9新特性

    Java8本地Date Time API

     

     

    LocalDate/本地時間和LocalDateTime類簡化時區不需要開發。

     

    讓我們來看看他們操作。

     

    選擇使用任何編輯器創建以下java程序在 C:/> JAVA

     

    Java8Tester.java

     

    import java.time.LocalDate;
    import java.time.LocalTime;
    import java.time.LocalDateTime;
    import java.time.Month;
    
    public class Java8Tester {
       public static void main(String args[]){
          Java8Tester java8tester = new Java8Tester();
          java8tester.testLocalDateTime(); 
       }
    
       public void testLocalDateTime(){
          // Get the current date and time
          LocalDateTime currentTime = LocalDateTime.now();     
          System.out.println("Current DateTime: " + currentTime);
    
          LocalDate date1 = currentTime.toLocalDate();
          System.out.println("date1: " + date1);
          Month month = currentTime.getMonth();
          int day = currentTime.getDayOfMonth();
          int seconds = currentTime.getSecond();
          System.out.println("Month: " + month
             +"day: " + day
             +"seconds: " + seconds
          );
    
          LocalDateTime date2 = currentTime.withDayOfMonth(10).withYear(2012);
          System.out.println("date2: " + date2);
    
          //12 december 2014
          LocalDate date3 = LocalDate.of(2014, Month.DECEMBER, 12); 
          System.out.println("date3: " + date3);
    
          //22 hour 15 minutes
          LocalTime date4 = LocalTime.of(22, 15); 
          System.out.println("date4: " + date4);
    
          //parse a string
          LocalTime date5 = LocalTime.parse("20:15:30"); 
          System.out.println("date5: " + date5);
       }	
    }
    
    

     

    驗證結果

     

    使用javac編譯器編譯如下類

     

    C:\JAVA>javac Java8Tester.java

     

    現在運行Java8Tester看到的結果

     

    C:\JAVA>java Java8Tester

     

    看到結果

     

    Current DateTime: 2014-12-09T11:00:45.457                                
    date1: 2014-12-09                                                        
    Month: DECEMBERday: 9seconds: 45                                         
    date2: 2012-12-10T11:00:45.457                                           
    date3: 2014-12-12                                                        
    date4: 22:15                                                             
    date5: 20:15:30 
    

     

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