Java OffsetTime compareTo()用法及代碼示例

Java中的OffsetTime類的compareTo()方法將此時間與另一個時間進行比較，如果它們相等，則返回零，或者根據比較結果返回正整數或負整數。

用法:

public int compareTo(OffsetTime other)

參數：此方法接受單個強製性參數other，該參數指定將與之進行比較的其他時間。

返回值：它返回比較器值。如果另一個日期較小，則返回負值；如果較大，則返回正值。

異常注意：如果傳遞的其他日期為null，則該函數將引發NullPointerException。

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.OffsetTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the time 
        OffsetTime time1 
            = OffsetTime.parse("15:30:30+07:00"); 
  
        // Parses the time 
        OffsetTime time2 
            = OffsetTime.parse("15:30:30+07:00"); 
  
        // gets the offset time1 
        System.out.println("time1: "
                           + time1); 
  
        // gets the offset time2 
        System.out.println("time1: "
                           + time2); 
  
        System.out.println("time1 when compared"
                           + " to time2 returns: "
                           + time1.compareTo(time2)); 
    } 
}

輸出：

time1: 15:30:30+07:00
time1: 15:30:30+07:00
time1 when compared to time2 returns: 0

程序2：

// Java program to demonstrate the compareTo() method 
  
import java.time.OffsetTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the time 
        OffsetTime time1 
            = OffsetTime.parse("15:30:30+07:00"); 
  
        // Parses the time 
        OffsetTime time2 
            = OffsetTime.parse("12:10:30+07:00"); 
  
        // gets the offset time1 
        System.out.println("time1: "
                           + time1); 
  
        // gets the offset time2 
        System.out.println("time1: "
                           + time2); 
  
        System.out.println("time1 when compared"
                           + " to time2 returns: "
                           + time1.compareTo(time2)); 
    } 
}

輸出：

time1: 15:30:30+07:00
time1: 12:10:30+07:00
time1 when compared to time2 returns: 1

示例3:：

// Java program to demonstrate the compareTo() method 
  
import java.time.OffsetTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the time 
        OffsetTime time1 
            = OffsetTime.parse("15:30:30+07:00"); 
  
        // Parses the time 
        OffsetTime time2 
            = OffsetTime.parse("17:10:30+07:00"); 
  
        // gets the offset time1 
        System.out.println("time1: "
                           + time1); 
  
        // gets the offset time2 
        System.out.println("time1: "
                           + time2); 
  
        System.out.println("time1 when compared"
                           + " to time2 returns: "
                           + time1.compareTo(time2)); 
    } 
}

輸出：

time1: 15:30:30+07:00
time1: 17:10:30+07:00
time1 when compared to time2 returns: -1

參考： https://docs.oracle.com/javase/8/docs/api/java/time/OffsetTime.html#compareTo-java.time.OffsetTime-

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