大家都知道，java是一门非常强大的编程语言，涉及到了我们生活与工作当中的方方面面。今天就通过实际的代码来为大家展示，如何用java获取当前的年月日。
首先通过实例为大家展示。
实例一、具体代码如下：
public static void getDateTime() throws ParseException
{
Calendar now = Calendar.getInstance();
System.out.println("年: " + now.get(Calendar.YEAR));
System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");
System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));
System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY));
System.out.println("分: " + now.get(Calendar.MINUTE));
System.out.println("秒: " + now.get(Calendar.SECOND));
System.out.println("当前时间毫秒数：" + now.getTimeInMillis());
System.out.println(now.getTime());
Date d = new Date();
System.out.println(d);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateNowStr = sdf.format(d);
System.out.println("格式化后的日期：" + dateNowStr);
String str = "2012-1-13 17:26:33"; //要跟上面sdf定义的格式一样
Date today = sdf.parse(str);
System.out.println("字符串转成日期：" + today);
}输出结果：
2014-12-26
年: 2014
月: 12
日: 26
时: 15
分: 6
秒: 35
当前时间毫秒数：1419577595014
Fri Dec 26 15:06:35 CST 2014
Fri Dec 26 15:06:35 CST 2014
格式化后的日期：2014-12-26 15:06:35
字符串转成日期：Fri Jan 13 17:26:33 CST 2012
实例二、具体代码如下：
package com.ob;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class DateTest
{
public static void main(String[] args) throws ParseException
{
Calendar now = Calendar.getInstance();
System.out.println("年: " + now.get(Calendar.YEAR));
System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");
System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));
System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY));
System.out.println("分: " + now.get(Calendar.MINUTE));
System.out.println("秒: " + now.get(Calendar.SECOND));
System.out.println("当前时间毫秒数：" + now.getTimeInMillis());
System.out.println(now.getTime());
Date d = new Date();
System.out.println(d);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateNowStr = sdf.format(d);
System.out.println("格式化后的日期：" + dateNowStr);
String str = "2012-1-13 17:26:33"; //要跟上面sdf定义的格式一样
Date today = sdf.parse(str);
System.out.println("字符串转成日期：" + today);
}
}输出结果：
年: 2012
月: 1
日: 13
时: 17
分: 28
秒: 19
当前时间毫秒数：1326446899902
Fri Jan 13 17:28:19 CST 2012
Fri Jan 13 17:28:19 CST 2012
格式化后的日期：2012-01-13 17:28:19
字符串转成日期：Fri Jan 13 17:26:33 CST 2012
实例三 joda-time、具体代码如下：
package com.ob;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class DateTest
{
public static void main(String[] args) throws ParseException
{
Calendar now = Calendar.getInstance();
System.out.println("年: " + now.get(Calendar.YEAR));
System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");
System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));
System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY));
System.out.println("分: " + now.get(Calendar.MINUTE));
System.out.println("秒: " + now.get(Calendar.SECOND));
System.out.println("当前时间毫秒数：" + now.getTimeInMillis());
System.out.println(now.getTime());
Date d = new Date();
System.out.println(d);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateNowStr = sdf.format(d);
System.out.println("格式化后的日期：" + dateNowStr);
String str = "2012-1-13 17:26:33"; //要跟上面sdf定义的格式一样
Date today = sdf.parse(str);
System.out.println("字符串转成日期：" + today);
}
}运行结果如下：
yearOfCentury: 15 monthOfYear: 9 dayOfMonth: 17
上述内容就是通过实际的代码为大家展示如何用java获取现在的年月日的具体操作了。想要了解更多java程序代码例子，敬请关注奇Q工具网。
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