JFrameが現在表示されているディスプレイの画面デバイス情報を取得します。

Question

JFrameが2つのディスプレイのうちどれに表示されているかを調べようとしています。

私は、任意の助けに感謝;）

Answer 1

利用getLocation()フレームの左上の座標を取得します。あなたの画面のレイアウトと解像度に基づいて、それはどの画面にあるかを計算する必要があります。また、役に立つかもしれません何

これを使用することにより、画面の合計の寸法を得ることです：時々私は後で解決策を鑑賞（質問がされた後も、年掲載）

Dimension dim = Toolkit.getDefaultToolkit().getScreenSize(); 

Answer 2

。これは...（もともとは、Oracleのマニュアルに基づいて）同じ問題の私のより複雑なソリューション...

はお楽しみですヘルパークラスの

// First some imports (it could spare your time)… 
import java.awt.GraphicsConfiguration; 
import java.awt.GraphicsDevice; 
import java.awt.GraphicsEnvironment; 
import java.awt.Rectangle; 
import java.awt.Window; 

定義：ない方法の

/** 
* This class just stores indexes and instances of a graphics device and 
* one of its configurations (within current graphics environment). 
*/ 
public class DeviceConfig 
{ 
    public int deviceIndex = 0; 
    public int configIndex = 0; 
    public GraphicsDevice device = null; 
    public GraphicsConfiguration config = null; 
} 

定義仕事：

/** 
* This method finds the graphics device and configuration by the location 
* of specified window. 
* 
* @param window the window for which should be the identified the graphics 
*     device and configuration 
* @return instance of custom class type (DeviceConfig) that stores the 
*   indexes and instances of graphics device and configuration of 
*   current graphics environment 
*/ 
public DeviceConfig findDeviceConfig(Window window) 
{ 
    // Prepare default return value: 
    DeviceConfig deviceConfig = new DeviceConfig(); 

    // More correct would be to return null when no device or configuration 
    // has been found: 
    // 
    // DeviceConfig deviceConfig = null; 
    // 
    // See also the comments marked by *** (below). 

    Rectangle windowBounds = window.getBounds(); 
    int lastArea = 0; 

    GraphicsEnvironment graphicsEnvironment = 
     GraphicsEnvironment.getLocalGraphicsEnvironment(); 

    GraphicsDevice[] graphicsDevices = 
     graphicsEnvironment.getScreenDevices(); 

    // Search through all devices… 
    for (int i = 0; i < graphicsDevices.length; ++i) 
    { 
     GraphicsDevice graphicsDevice = graphicsDevices[i]; 

     GraphicsConfiguration[] graphicsConfigurations = 
      graphicsDevice.getConfigurations(); 

     // It is possible that your device will have only one configuration, 
     // but you cannot rely on this(!)… 
     for (int j = 0; j < graphicsConfigurations.length; ++j) 
     { 
      GraphicsConfiguration graphicsConfiguration = 
       graphicsConfigurations[j]; 

      Rectangle graphicsBounds = 
       graphicsConfiguration.getBounds(); 

      Rectangle intersection = windowBounds. 
       intersection(graphicsBounds); 

      int area = intersection.width * intersection.height; 

      if (0 != area) 
      { 
       // *** 
       // The block of code in this comments is relevant in case you 
       // want to return the null value when no device or 
       // configuration has been found. 
       /* 
       if (null == deviceConfig) 
       { 
        // In this case the better solution would be to declare 
        // the full constructor in the DeviceClass (see below) and 
        // use it here like this: 

        deviceConfig = new DeviceConfig(i, j, 
         graphicsDevice, graphicsConfiguration); 

        // (but the current solution is more simple when no 
        // constructor is defined)… 

       } 
       else 
       */ 

       if (area > lastArea) 
       { 
        lastArea = area; 
        deviceConfig.deviceIndex = i; 
        deviceConfig.configIndex = j; 
        deviceConfig.device = graphicsDevice; 
        deviceConfig.config = graphicsConfiguration; 
       } 
      } 
     } 
    } 

    return deviceConfig; 
} 

DeviceConfig Cの再定義すべての読者のための

// *** 
// The DeviceConfig class with constructors would look like this: 

public class DeviceConfig 
{ 
    public int deviceIndex; 
    public int configIndex; 
    public GraphicsDevice device; 
    public GraphicsConfiguration config; 

    /** The default constructor. (Would not be used in the second case.) */ 
    public DeviceConfig() 
    { 
     deviceIndex = 0; 
     configIndex = 0; 
     device = null; 
     config = null; 
    } 

    /** The full constructor. */ 
    public DeviceConfig(int i, int j, 
     GraphicsDevice graphicsDevice, 
     GraphicsConfiguration graphicsConfiguration) 
    { 
     deviceIndex = i; 
     configIndex = j; 
     device = graphicsDevice; 
     config = graphicsConfiguration; 
    } 
} 

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ポストScriptum：（上記のコメントで述べた）null戻り値のコンテキストでの小娘あなたは、あなたのニーズに合わせてこの例を簡素化する（または事前）することができます...

（私が助けてくれることを願って... ;-)）