import sun.java2d.d3d.D3DGraphicsDevice; //导入依赖的package包/类
protected GraphicsDevice makeScreenDevice(int screennum) {
    GraphicsDevice device = null;
    if (WindowsFlags.isD3DEnabled()) {
        device = D3DGraphicsDevice.createDevice(screennum);
    }
    if (device == null) {
        device = new Win32GraphicsDevice(screennum);
    }
    return device;
}
 

import sun.java2d.d3d.D3DGraphicsDevice; //导入依赖的package包/类
@Override
public boolean isFlipStrategyPreferred(ComponentPeer peer) {
    GraphicsConfiguration gc;
    if (peer != null && (gc = peer.getGraphicsConfiguration()) != null) {
        GraphicsDevice gd = gc.getDevice();
        if (gd instanceof D3DGraphicsDevice) {
            return ((D3DGraphicsDevice)gd).isD3DEnabledOnDevice();
        }
    }
    return false;
}