Java中的 Calendar getTimeInMillis() 方法及示例

Calendar 类中的getTimeInMillis()方法用于返回此 Calendar 的当前时间（以毫秒为单位）。
句法：

public long getTimeInMillis()

参数：该方法不带任何参数。
返回值：该方法以毫秒为单位返回此日历的当前时间。
下面的程序说明了 Calendar 类的 getTimeInMillis() 方法的工作：
示例 1：

Java

// 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

示例 2：

Java

// 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： https: Java/util/Calendar.html#getTimeInMillis–