import java.text.ParseException; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Date;

import org.junit.Test;

public class TestDate {

 /**   * Date型別轉換為String型別，例如：2018-11-04 13:52:23   */  public void getNowDateToStr() {   Date currentTime = new Date();   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   String dateString = formatter.format(currentTime);  }

 /**   * Date型別轉換為String型別，例如：2018-11-04   */  public void date() {   Date currentTime = new Date();   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");   String dateString = formatter.format(currentTime);  }

 /**   * Date型別轉換為String型別，例如：2018-11-04   */  public void date1() {   SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");   Date currentTime = new Date();   String dateString = formatter.format(currentTime);  }

 /**   * String型別轉換為Date型別，例如：2018-11-04 13:52:23   */  public void date2() {   String dateString = "2018-11-04 13:52:23";   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   ParsePosition pos = new ParsePosition(0);   Date strtodate = formatter.parse(dateString, pos);  }

 /**   * String型別轉換為Date型別，例如：2018-11-04   */  public void date3() {   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");   Date d = new Date();   String dateStr = formatter.format(d);  }

 /**   * String型別轉換為Date型別，例如：2018-11-04   */  public void date4() {   String dateString = "2018-11-04";   SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");   ParsePosition pos = new ParsePosition(0);   Date strtodate = formatter.parse(dateString, pos);  }

 /**   * Date型別轉換為String型別，例如：20181104 135223   */  public void getNowDate5() throws ParseException {   Date currentTime = new Date();   SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd HHmmss");   String dateString = formatter.format(currentTime);  }

}