Java 中的 Instant compareTo() 方法
可以使用 Java 中 Instant 類的 compareTo() 方法比較兩個 Instant 物件。此方法需要一個引數,即要比較的 Instant 物件。
如果第一個 Instant 物件大於第二個 Instant 物件,則它返回正數,如果第一個 Instant 物件小於第二個 Instant 物件,則它返回負數,如果兩個 Instant 物件相等,則它返回零。
展示此方法的程式如下所示
示例
import java.time.*; public class Demo { public static void main(String[] args) { Instant i1 = Instant.parse("2019-01-13T18:35:19.00Z"); Instant i2 = Instant.parse("2019-01-13T16:10:35.00Z"); System.out.println("The first Instant object is: " + i1); System.out.println("The second Instant object is: " + i2); int val = i1.compareTo(i2); if(val > 0) System.out.println("
The first Instant object is greater than the second Instant object"); else if(val < 0) System.out.println("
The first Instant object is lesser than the second Instant object"); else System.out.println("
The Instant objects are equal"); } }
輸出
The first Instant object is: 2019-01-13T18:35:19Z The second Instant object is: 2019-01-13T16:10:35Z The first Instant object is greater than the second Instant object
下面我們來理解一下上述程式。
首先顯示兩個 Instant 物件。然後,使用 compareTo() 方法對其進行比較,並使用 if else 語句顯示結果。演示此方法的程式碼片段如下
Instant i1 = Instant.parse("2019-01-13T18:35:19.00Z"); Instant i2 = Instant.parse("2019-01-13T16:10:35.00Z"); System.out.println("The first Instant object is: " + i1); System.out.println("The second Instant object is: " + i2); int val = i1.compareTo(i2); if(val > 0) System.out.println("
The first Instant object is greater than the second Instant object"); else if(val < 0) System.out.println("
The first Instant object is lesser than the second Instant object"); else System.out.println("
The Instant objects are equal");
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