Java 中的 Calendar.before()方法
原文:https://www . geesforgeks . org/calendar-before-in-method-Java/
java.util.Calendar.before()是 java.util 包的 Calendar 类中的一个方法。当对象出现时，如果本日历所代表的时间在所代表的时间之前，则方法返回真。如果不是，则返回假。
语法:
public boolean before(Object when)
Where, when is the Object
that is to be compared.
下面是一些例子，可以更好地理解 Calendar.before()函数的实现。
例 1 :
// Implementation to show the usage
// of before(Object when) method of
// Calendar class
import java.util.*;
class GFG {
public static void main(String[] args)
throws InterruptedException
{
// creating calendar object
Calendar cal_obj1 = Calendar.getInstance();
// printing current date
System.out.println("Time 1 : " + cal_obj1.getTime());
// sleep for 3 seconds
Thread.sleep(3000);
// creating Calendar object
Calendar cal_obj2 = Calendar.getInstance();
// printing current date
System.out.println("Time 2 : " + cal_obj2.getTime());
// checking if 1st date is before 2nd date
// and printing the result
System.out.println(cal_obj1.before(cal_obj2));
}
}
输出:
Time 1 : Wed Feb 28 15:43:19 IST 2018
Time 2 : Wed Feb 28 15:43:22 IST 2018
true
例 2 :
// Implementation to show the usage
// of before(Object when) method of
// Calendar class
import java.util.*;
class GFG {
public static void main(String[] args)
{
// creating calendar objects
Calendar cal_obj1 = Calendar.getInstance();
Calendar cal_obj2 = Calendar.getInstance();
// displaying the current date
System.out.println("Current date is : " + cal_obj1.getTime());
// changing year in cal_obj2 calendar
cal_obj2.set(Calendar.YEAR, 2010);
// displaying the year
System.out.println("Year is " + cal_obj2.get(Calendar.YEAR));
// check if calendar date is before current date
System.out.println("Result : " + cal_obj1.before(cal_obj2));
}
}
输出:
Current date is : Wed Feb 28 15:50:16 IST 2018
Year is 2010
Result : false
例 3 :
// Implementation to show the usage
// of before(Object when) method of
// Calendar class
import java.util.*;
class GFG {
public static void main(String[] args)
{
// creating calendar objects
Calendar cal_obj1 = Calendar.getInstance();
Calendar cal_obj2 = Calendar.getInstance();
// displaying the current date
System.out.println("Current date is : " + cal_obj1.getTime());
// changing year in cal_obj2 calendar
cal_obj2.set(Calendar.YEAR, 2025);
// displaying the year
System.out.println("Year is " + cal_obj2.get(Calendar.YEAR));
// check if calendar date is before current date
System.out.println("Result : " + cal_obj1.before(cal_obj2));
}
}
输出:
Current date is : Wed Feb 28 16:15:55 IST 2018
Year is 2025
Result : true
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