Java LocalTime minusHours()用法及代碼示例

LocalTime類的minusHours()方法用於從此LocalTime中減去指定的Hours值，然後將結果作為LocalTime對象返回。這一瞬間是一成不變的。計算大約在午夜結束。

用法:

public LocalTime minusHours(long hoursToSubtract)

參數：此方法接受單個參數hoursToSubtract，它是要減去的小時數的值，它可以是負值。

返回值：此方法基於此時間返回LocalTime減去小時數。

以下示例程序旨在說明minusHours()方法：

示例1:

// Java program to demonstrate 
// LocalTime.minusHours() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a LocalTime object 
        LocalTime time 
            = LocalTime.parse("19:34:50.63"); 
  
        // print LocalTime 
        System.out.println("LocalTime before subtraction: "
                           + time); 
  
        // subtract 3 hours using minusHours() 
        LocalTime value = time.minusHours(3); 
  
        // print result 
        System.out.println("LocalTime after subtraction: "
                           + value); 
    } 
}

輸出：

LocalTime before subtraction: 19:34:50.630
LocalTime after subtraction: 16:34:50.630

示例2:

// Java program to demonstrate 
// LocalTime.minusHours() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a LocalTime object 
        LocalTime time 
            = LocalTime.parse("01:00:01"); 
  
        // print LocalTime 
        System.out.println("LocalTime before subtraction: "
                           + time); 
  
        // subtract 7 hours using minusHours() 
        LocalTime value = time.minusHours(7); 
  
        // print result 
        System.out.println("LocalTime after subtraction: "
                           + value); 
    } 
}

輸出：

LocalTime before subtraction: 01:00:01
LocalTime after subtraction: 18:00:01

參考文獻： https://docs.oracle.com/javase/10/docs/api/java/time/LocalTime.html#minusHours(long)

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