import net.java.games.input.Component.Identifier.Axis; //导入依赖的package包/类
private void loadIdentifiers(int controllerIdx, Controller c){
    Component[] ces = c.getComponents();
    int numButtons = 0;
    int numAxes = 0;
    xAxis = -1;
    yAxis = -1;
    for (Component comp : ces){
        Identifier id = comp.getIdentifier();
        if (id instanceof Button){
            buttonIdsToIndices[controllerIdx].put((Button)id, numButtons);
            numButtons ++;
        }else if (id instanceof Axis){
            Axis axis = (Axis) id;
            if (axis == Axis.X){
                xAxis = numAxes;
            }else if (axis == Axis.Y){
                yAxis = numAxes;
            }

            axisIdsToIndices[controllerIdx].put((Axis)id, numAxes);
            numAxes ++;
        }
    }
}
 

import net.java.games.input.Component.Identifier.Axis; //导入依赖的package包/类
public JoystickHandler()
{
	connectBuffer();
	
	Controller[] ca = ControllerEnvironment.getDefaultEnvironment()
			.getControllers();
	
	// find the joystick
	for (int i = 0; i < ca.length; i++)
	{
		
		if (ca[i].getType() ==Controller.Type.STICK )
		{
			joystick = ca[i];
			x_axis = joystick.getComponent(Component.Identifier.Axis.X);
			landButton = joystick.getComponent(Component.Identifier.Button.TRIGGER);
		}
	}		
}