Java 日历 getTimeInMillis()方法及示例

Calendar类中的 getTimeInMillis() 方法用于返回该日历的当前时间，单位为毫秒。

语法：

public long getTimeInMillis()

参数： 该方法不接受任何参数。

返回值： 该方法以毫秒为单位返回该日历的当前时间。

以下程序说明了日历类的getTimeInMillis()方法的工作：

例子1：

// Java code to illustrate
// getTimeInMillis() method
 
import java.util.*;
 
public class Calendar_Demo {
 
    public static void main(String args[])
        throws InterruptedException
    {
 
        // Creating a calendar
        Calendar calndr1 = Calendar.getInstance();
 
        // Displaying the current time
        System.out.println("The Current Time"
                           + " is: "
                           + calndr1.getTimeInMillis());
 
        // Adding few delay
        Thread.sleep(10000);
 
        // Creating another calendar
        Calendar calndr2 = Calendar.getInstance();
 
        // Displaying the upcoming time
        System.out.println("The Upcoming Time"
                           + " is: "
                           + calndr2.getTimeInMillis());
    }
}

输出

The Current Time is: 1550725664034
The Upcoming Time is: 1550725674053

例2：

// Java code to illustrate
// getTimeInMillis() method
 
import java.util.*;
 
public class Calendar_Demo {
 
    public static void main(String args[])
        throws InterruptedException
    {
 
        // Creating a calendar
        Calendar calndr1 = Calendar.getInstance();
 
        // Displaying the current time
        System.out.println("The Current Time"
                           + " is: "
                           + calndr1.getTimeInMillis());
 
        // Adding few delay
        Thread.sleep(5000);
 
        // Creating another calendar
        Calendar calndr2 = Calendar.getInstance();
 
        // Displaying the upcoming time
        System.out.println("The Upcoming Time"
                           + " is: "
                           + calndr2.getTimeInMillis());
    }
}

输出

The Current Time is: 1550725683182
The Upcoming Time is: 1550725688208

参考资料: https://docs.oracle.com/javase/8/docs/api/java/util/Calendar.html#getTimeInMillis-