JavaFX 類 Dimension2D用法及代碼示例

Dimension2D類是JavaFX的一部分。 Dimension2D類是一個存儲高度和寬度的對象。它繼承了java.lang.Object類。

該類的構造函數：

1. Dimension2D(double width, double height)：創建具有指定寬度和高度的尺寸對象。

常用方法：

方法	說明
equals(Object obj)	返回兩個Dimension2D對象是否相等
getHeight()	返回Dimension2d對象的高度
getWidth()	返回Dimension2d對象的寬度
hashCode()	返回Dimension2D對象的哈希碼值。

下麵的程序將說明Dimension2D類的用法：

1. Java程序，用於創建Dimension2D對象並顯示其內容：該程序創建一個名為Dimension的Dimension2D對象。尺寸的高度和寬度作為參數傳遞。然後使用getHeight()和getWidth()函數從對象中提取高度和寬度，並顯示相應的值。

   // Java program to create a Dimension2D  
   // object and display its contents 
   import javafx.geometry.*; 
     
   public class Dimension_1 { 
     
       // Main Method 
       public static void main(String args[]) 
       { 
     
           // create a dimension object 
           Dimension2D dimension = new Dimension2D(20.0f, 50.0f); 
     
           double height, width; 
     
           // get the height and width of the dimension2D 
           height = dimension.getHeight(); 
           width = dimension.getWidth(); 
     
           // display the height and width of dimension2D 
           System.out.println("Height = " + height + " Width = " + width); 
       } 
   }

   輸出：

   Height = 50.0 Width = 20.0
   

2. 創建3個Dimension2D對象的Java程序將顯示其內容以及一個對象與另一個對象如何相等：此程序將創建三個名為Dimension_1，dimension_2，dimension_3的Dimension2D對象。尺寸的高度和寬度作為參數傳遞。然後使用getHeight()和getWidth()函數從對象中提取高度和寬度，並顯示相應的值。然後使用equals()函數比較這三個對象，並顯示結果。

   // Java program to create 3 Dimension2D objects display 
   // its contents and how whether one object is equal to  
   // the other or not 
   import javafx.geometry.*; 
     
   public class Dimension_2 { 
     
       // Main Method 
       public static void main(String args[]) 
       { 
     
           // create three dimension objects 
           Dimension2D dimension_1 = new Dimension2D(20.0f, 50.0f); 
           Dimension2D dimension_2 = new Dimension2D(120.0f, 150.0f); 
           Dimension2D dimension_3 = new Dimension2D(20.0f, 50.0f); 
     
           // display the coordinates of the 3 dimensions 
           display(dimension_1); 
           display(dimension_2); 
           display(dimension_3); 
     
           // check whether any dimension is equal to other or not 
           System.out.println("Dimension 1 equals Dimension 2 = " 
                              + dimension_1.equals(dimension_2)); 
     
           System.out.println("Dimension 2 equals Dimension 3 = " 
                               + dimension_2.equals(dimension_3)); 
     
           System.out.println("Dimension 3 equals Dimension 1 = " 
                               + dimension_3.equals(dimension_1)); 
       } 
     
       // Display Method 
       public static void display(Dimension2D dimension) 
       { 
     
           double height, width; 
     
           // get the cheight and width of the dimension 
           height = dimension.getHeight(); 
           width = dimension.getWidth(); 
     
           // display the height and width of dimension2D 
           System.out.println("Height = " + height + " Width = " + width); 
       } 
   }

   輸出：

   Height = 50.0 Width = 20.0
   Height = 150.0 Width = 120.0
   Height = 50.0 Width = 20.0
   Dimension 1 equals Dimension 2 = false
   Dimension 2 equals Dimension 3 = false
   Dimension 3 equals Dimension 1 = true
   

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/geometry/Dimension2D.html