Java LocalDateTime isBefore()用法及代碼示例

Java中的LocalDateTime類的isBefore()方法檢查此日期是否在指定的日期時間之前。

用法:

public boolean isAfter(ChronoLocalDateTime other)

參數：此方法接受參數other，這是要與之比較的其他日期時間。它不能為空。

返回值：該函數返回布爾值：如果此日期時間早於指定的日期時間。

以下示例程序旨在說明LocalDateTime.isBefore()方法：

示例1:

// Program to illustrate the isBefore() method 
  
import java.util.*; 
import java.time.*; 
  
public class GfG { 
    public static void main(String[] args) 
    { 
        // Parses the date 
        LocalDateTime dt1 
            = LocalDateTime 
                  .parse("2018-11-03T12:45:30"); 
  
        // Prints the date 
        System.out.println("Date 1: " + dt1); 
  
        // Parses the date 
        LocalDateTime dt2 
            = LocalDateTime 
                  .parse("2016-12-04T12:45:30"); 
  
        // Prints the date 
        System.out.println("Date 2: " + dt2); 
  
        // Compares both dates 
        System.out.println("Is Date 1 before Date 2: "
                           + dt1.isBefore(dt2)); 
    } 
}

輸出：

Date 1: 2018-11-03T12:45:30
Date 2: 2016-12-04T12:45:30
Is Date 1 before Date 2: false

示例2:

// Program to illustrate the isBefore() method 
  
import java.util.*; 
import java.time.*; 
  
public class GfG { 
    public static void main(String[] args) 
    { 
        // Parses the date 
        LocalDateTime dt1 
            = LocalDateTime 
                  .parse("2018-11-03T12:45:30"); 
  
        // Prints the date 
        System.out.println("Date 1: " + dt1); 
  
        // Parses the date 
        LocalDateTime dt2 
            = LocalDateTime 
                  .parse("2019-12-04T12:45:30"); 
  
        // Prints the date 
        System.out.println("Date 2: " + dt2); 
  
        // Compares both dates 
        System.out.println("Is Date 1 before Date 2: "
                           + dt1.isBefore(dt2)); 
    } 
}

輸出：

Date 1: 2018-11-03T12:45:30
Date 2: 2019-12-04T12:45:30
Is Date 1 before Date 2: true

參考： https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#isBefore(java.time.chrono.ChronoLocalDateTime)

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