日历Java中的before（）方法-yiteyi-C++库

JAVAutil。日历before（）是日历 java类。util包。该方法返回 符合事实的 如果此日历表示的时间早于 什么时候 对象如果不是这样， 错误的 被退回。

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语法：

public boolean before(Object when)

Where, when is the Object 
that is to be compared.

下面是一些了解日历实现的示例。before（）函数以更好的方式运行。

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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