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[java]
getMaximum getActualMaximum getLeastMaximum の違い。
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import java.text.ParseException; | |
import java.text.SimpleDateFormat; | |
import java.util.Calendar; | |
public class Main { | |
public static void main(String[] args) throws ParseException { | |
Calendar c = Calendar.getInstance(); | |
c.setTime(new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").parse("2012-02-20 00:00:00")); | |
System.out.println(c.get(Calendar.DATE)); // -> 20 | |
System.out.println(c.getMinimum(Calendar.DATE)); // -> 1 | |
System.out.println(c.getActualMinimum(Calendar.DATE)); // -> 1 | |
System.out.println(c.getGreatestMinimum(Calendar.DATE)); // -> 1 | |
System.out.println(c.getMaximum(Calendar.DATE)); // -> 31 ★ 引数のフィールドが取りうる最大値。 | |
System.out.println(c.getActualMaximum(Calendar.DATE)); // -> 29 ★ 引数のフィールドが、このCalendarオブジェクトのその他のフィールド(この場合DATE以外のフィールド)との整合性において取りうる最大値。 | |
System.out.println(c.getLeastMaximum(Calendar.DATE)); // -> 28 ★ 引数のフィールドがMAX値として取りうる値の中での最小値。 | |
c.setTime(new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").parse("2013-02-20 00:00:00")); | |
System.out.println(c.get(Calendar.DATE)); // -> 20 | |
System.out.println(c.getMinimum(Calendar.DATE)); // -> 1 | |
System.out.println(c.getActualMinimum(Calendar.DATE)); // -> 1 | |
System.out.println(c.getGreatestMinimum(Calendar.DATE)); // -> 1 | |
System.out.println(c.getMaximum(Calendar.DATE)); // -> 31 | |
System.out.println(c.getActualMaximum(Calendar.DATE)); // -> 28 ★ 2013年はうるう年ではないので、「正確な最大値」は 28。 | |
System.out.println(c.getLeastMaximum(Calendar.DATE)); // -> 28 | |
} | |
} |
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http://docs.oracle.com/javase/jp/1.5.0/api/java/util/Calendar.html