Java OffsetDateTime compareTo()用法及代碼示例

Java中OffsetDateTime類的compareTo()方法將此日期時間與另一個日期時間進行比較。

用法:

public int compareTo(OffsetDateTime other)

參數：此方法接受單個參數other，該參數指定要比較的其他日期時間，而不是null。

返回值：它返回比較器值，如果小於則返回負值，如果大於則返回正值。

以下示例程序旨在說明compareTo()方法：

示例1:

// Java program to demonstrate the compareTo() method 
  
import java.time.OffsetDateTime; 
import java.time.ZonedDateTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the date1 
        OffsetDateTime date1 = OffsetDateTime.parse("2018-12-12T13:30:30+05:00"); 
  
        // Parses the date2 
        OffsetDateTime date2 = OffsetDateTime.parse("2018-12-12T13:30:30+05:00"); 
  
        // Prints both dates 
        System.out.println("Date1: " + date1); 
        System.out.println("Date2: " + date2); 
  
        // Compare both 
        System.out.println("On coparing we get " + date1.compareTo(date2)); 
    } 
}

輸出：

Date1: 2018-12-12T13:30:30+05:00
Date2: 2018-12-12T13:30:30+05:00
On coparing we get 0

程序2：

// Java program to demonstrate the compareTo() method 
import java.time.OffsetDateTime; 
import java.time.ZonedDateTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the date1 
        OffsetDateTime date1 = OffsetDateTime.parse("2018-12-12T13:30:30+05:00"); 
  
        // Parses the date2 
        OffsetDateTime date2 = OffsetDateTime.parse("2015-12-12T13:30:30+05:00"); 
  
        // Prints both dates 
        System.out.println("Date1: " + date1); 
        System.out.println("Date2: " + date2); 
  
        // Compare both 
        System.out.println("On coparing we get " + date1.compareTo(date2)); 
    } 
}

輸出：

Date1: 2018-12-12T13:30:30+05:00
Date2: 2015-12-12T13:30:30+05:00
On coparing we get 3

程序3：

// Java program to demonstrate the compareTo() method 
import java.time.OffsetDateTime; 
import java.time.ZonedDateTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the date1 
        OffsetDateTime date1 = OffsetDateTime.parse("2013-12-12T13:30:30+05:00"); 
  
        // Parses the date2 
        OffsetDateTime date2 = OffsetDateTime.parse("2015-12-12T13:30:30+05:00"); 
  
        // Prints both dates 
        System.out.println("Date1: " + date1); 
        System.out.println("Date2: " + date2); 
  
        // Compare both 
        System.out.println("On coparing we get " + date1.compareTo(date2)); 
    } 
}

輸出：

Date1: 2013-12-12T13:30:30+05:00
Date2: 2015-12-12T13:30:30+05:00
On coparing we get -2

參考： https://docs.oracle.com/javase/8/docs/api/java/time/temporal/TemporalAdjuster.html

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