Getting started with Java lesson 103 - output the days of each month of a year

Monkeys learn to program 2020-11-13 02:38:58
getting started java lesson output


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problem

     On the basis of the previous case , obtain 2013 The number of days in each month of the year .

programme

     First , Use Calendar Class getInstance Method to get the current date - Time ; Then the date - Time is 2013 year , Day is 1 Japan ; Last , Using a loop , Cycle from 1 Monthly cycle to 12 month , Modify the current date in the loop - Month of time object , have access to getActualMaximum Method to get the number of days in each month , The declaration of this method is as follows :

getActualMaximum(int field)

     This method means that given this Calendar Time value of , Returns the maximum value that a specified calendar field may have . You can specify the date field as Calendar.DATE.

step

Step one : Build test methods

     First , Use Calendar Class getInstance Method to get the current date - Time ; then , Modify the date - Time is 2013 year , Day is 1 Japan , The code is as follows :

 package day03;
    
    import java.util.Calendar;
    import java.util.GrogorianCalendar;
    import org.junit.Test;
    
    public class TestCalendar{
     /**
      * Output the number of days in each month of a year
      */
      @Test
      public void testGetActualMaximum(){
          int year=2013;
          Calendar c=Calendar.getInstance();
          c.set(Calendar.YEAR,year);
          c.set(Calendar.DATE,1);
      }
    }

Step two : Use getActualMaximum Method     

     Using a loop , Cycle from 1 Monthly cycle to 12 month , Modify the current date in the loop - Month of time object , have access to getActualMaximum Method to get the number of days in each month , The code is as follows :

 package day03;
    
    import java.util.Calendar;
    import java.util.GrogorianCalendar;
    import org.junit.Test;
    
    public class TestCalendar{
     /**
      * Output the number of days in each month of a year
      */
      @Test
      public void testGetActualMaximum(){
          int year=2013;
          Calendar c=Calendar.getInstance();
          c.set(Calendar.YEAR,year);
          c.set(Calendar.DATE,1);
          
          for(int month=Calendar.JANUARY;month<=Calendar.DECEMBER;month++){
              c.set(Calendar.MONTH,month);
              System.out.println(year+" year "+(month+1)+" month :"+c.getActualMaximum(Calendar.DATE)+" God ");
          }
      }
    }

     Note here ,Calendar.MONTH The field represents the month , The beginning of the month is not 1, It is 0, So you need to add... To the value of the month you get 1 To match the actual month .

Step three : function

     function testGetActualMaximum Method , The console output is as follows :

 2013 year 1 month :31 God
    2013 year 2 month :28 God
    2013 year 3 month :31 God
    2013 year 4 month :30 God
    2013 year 5 month :31 God
    2013 year 6 month :30 God
    2013 year 7 month :31 God
    2013 year 8 month :31 God
    2013 year 9 month :30 God
    2013 year 10 month :31 God
    2013 year 11 month :30 God
    2013 year 12 month :31 God 

     As can be seen from the output , Have already put 2013 The number of days corresponding to each month of the year is obtained .

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