JavaFX 類 Duration用法及代碼示例

持續時間類是JavaFX的一部分。 Duration類定義了一段時間。 Duration類是不可變的，因此將其替換而不是修改。有兩種方法可以創建Duration類：

使用構造函數
使用諸如秒(double)或分鍾(double)的靜態構造方法之一

該類的構造函數：

Duration(double m)：使用指定的持續時間(以毫秒為單位)創建一個新的Duration對象。

常用方法：

方法	說明
add(Duration d)	將持續時間d添加到持續時間對象
subtract(Duration d)	將持續時間d減去持續時間對象
divide(Duration d)	將持續時間d除以持續時間對象
multiply(Duration d)	將持續時間d乘以持續時間對象
millis(double m)	返回具有指定持續時間(以毫秒為單位)的持續時間對象
seconds(double m)	返回具有指定持續時間(以秒為單位)的持續時間對象
minutes(double m)	返回具有指定持續時間(以分鍾為單位)的持續時間對象
hours(double m)	返回具有指定持續時間(以小時為單位)的持續時間對象
toMillis()	返回此時間段內的毫秒數
toSeconds()	返回此期間的秒數
toMinutes()	返回此期間的分鍾數
toHours()	返回此時段的小時數
lessThan(Duration d)	如果指定的持續時間小於此實例的(<)，則返回true。
greaterThan(Duration d)	如果指定的持續時間大於(>)此實例，則返回true。
greaterThanOrEqualTo(Duration d)	如果指定的持續時間大於或等於此實例(> =)，則返回true。
lessThanOrEqualTo(Duration d)	如果指定的持續時間小於或等於此實例的(<=)，則返回true。

以下示例程序旨在說明Duration類的用法：

Java程序創建兩個Duration對象，並以毫秒，秒，分鍾和小時顯示時間：該程序創建兩個名為Duration_1和duration_2的Duration對象。毫秒數作為參數傳遞。調用display函數，並將duration對象作為參數傳遞。使用函數toHours()，toMinutes()，toSeconds()，toMillis()將持續時間轉換為小時，分鍾，秒和毫秒。並顯示結果。

// Java Program to create two Duration objects and 
// display the time in milliseconds seconds,  
// minutes and hours 
import javafx.util.Duration; 
import java.util.*; 
   
class Duration_1 { 
   
    // Main Method 
    public static void main(String args[]) 
    { 
   
        try { 
   
            // duration object 
            Duration duration_1 = new Duration(1000000); 
            Duration duration_2 = new Duration(100012); 
   
            // display the duration 
            System.out.println("Duration 1"); 
            display(duration_1); 
            System.out.println(""); 
            System.out.println("Duration 2"); 
            display(duration_2); 
        } 
   
        catch (Exception e)  
        { 
            System.err.println(e.getMessage()); 
        } 
    } 
   
    // display function 
    public static void display(Duration duration) 
    { 
   
        // display the details of a duration 
        System.out.println("Duartion in miliseconds:" 
                               + duration.toMillis()); 
  
        System.out.println("Duartion in seconds:" 
                          + duration.toSeconds()); 
  
        System.out.println("Duartion in minutes:" 
                         + duration.toMinutes()); 
  
        System.out.println("Duartion in hours:" 
                          + duration.toHours()); 
    } 
}

輸出：

Duration 1
Duartion in miliseconds:1000000.0
Duartion in seconds:1000.0
Duartion in minutes:16.666666666666668
Duartion in hours:0.2777777777777778

Duration 2
Duartion in miliseconds:100012.0
Duartion in seconds:100.012
Duartion in minutes:1.6668666666666667
Duartion in hours:0.02778111111111111

Java程序創建四個Duration對象並顯示它們，並添加兩個對象，將兩個對象相乘，除以兩個對象，然後減去兩個對象並顯示結果：該程序創建四個名為Duration_1，duration_2，duration_3和duration_4的Duration對象。調用display函數，並將duration對象作為參數傳遞。使用函數toHours()，toMinutes()，toSeconds()，toMillis()將持續時間轉換為小時，分鍾，秒和毫秒。並顯示結果。將duration_1和duration_2相加和相減，並顯示結果對象。類似地，duration_3和duration_4被除以並相乘，並顯示結果對象。

// Java program to create four Duration object and 
// display them and add two objects, multiply two  
// objects, divide two objects and subtract two  
// objects and display the results. 
import javafx.util.Duration; 
import java.util.*; 
  
class Duration_2 { 
  
    // Main Method 
    public static void main(String args[]) 
    { 
  
        try { 
  
            // duration object 
            Duration duration_1 = Duration.millis(1000000); 
            Duration duration_2 = Duration.seconds(100012); 
            Duration duration_3 = Duration.hours(18912); 
            Duration duration_4 = Duration.minutes(45634); 
  
            // display the duration 
            System.out.println("\nDuration 1\n"); 
            display(duration_1); 
            System.out.println("\nDuration 2\n"); 
            display(duration_2); 
            System.out.println("\nDuration 3\n"); 
            display(duration_3); 
            System.out.println("\nDuration 4\n"); 
            display(duration_4); 
  
            System.out.println("\nAdd duration 1 and duration 2\n"); 
            display(duration_1.add(duration_2)); 
  
            System.out.println("\nDivide duration 3 and duration 4\n"); 
            display(duration_3.divide(duration_4)); 
  
            System.out.println("\nMutiply duration 3 and duration 4\n"); 
            display(duration_3.multiply(duration_4)); 
  
            System.out.println("\nSubstract duration 1 and duration 2\n"); 
            display(duration_1.subtract(duration_2)); 
        } 
  
        catch (Exception e)  
        { 
            System.err.println(e.getMessage()); 
        } 
    } 
  
    // display method 
    public static void display(Duration duration) 
    { 
  
        // display the details of a duration 
        System.out.println("Duartion in miliseconds:" 
                               + duration.toMillis()); 
  
        System.out.println("Duartion in seconds:" 
                          + duration.toSeconds()); 
  
        System.out.println("Duartion in minutes:" 
                           + duration.toMinutes()); 
  
        System.out.println("Duartion in hours:" 
                           + duration.toHours()); 
    } 
}

輸出：

Duration 1

Duartion in miliseconds:1000000.0
Duartion in seconds:1000.0
Duartion in minutes:16.666666666666668
Duartion in hours:0.2777777777777778

Duration 2

Duartion in miliseconds:1.00012E8
Duartion in seconds:100012.0
Duartion in minutes:1666.8666666666666
Duartion in hours:27.781111111111112

Duration 3

Duartion in miliseconds:6.80832E10
Duartion in seconds:6.80832E7
Duartion in minutes:1134720.0
Duartion in hours:18912.0

Duration 4

Duartion in miliseconds:2.73804E9
Duartion in seconds:2738040.0
Duartion in minutes:45634.0
Duartion in hours:760.5666666666667

Add duration 1 and duration 2

Duartion in miliseconds:1.01012E8
Duartion in seconds:101012.0
Duartion in minutes:1683.5333333333333
Duartion in hours:28.058888888888887

Divide duration 3 and duration 4

Duartion in miliseconds:24.86567033352325
Duartion in seconds:0.02486567033352325
Duartion in minutes:4.1442783889205417E-4
Duartion in hours:6.907130648200903E-6

Mutiply duration 3 and duration 4

Duartion in miliseconds:1.86414524928E20
Duartion in seconds:1.86414524928E17
Duartion in minutes:3.1069087488E15
Duartion in hours:5.178181248E13

Substract duration 1 and duration 2

Duartion in miliseconds:-9.9012E7
Duartion in seconds:-99012.0
Duartion in minutes:-1650.2
Duartion in hours:-27.503333333333334

注意：以上程序可能無法在在線IDE中運行。請使用離線編譯器。

參考： https://docs.oracle.com/javase/8/javafx/api/javafx/util/Duration.html

相關用法

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