无法使用按钮实例化类 [英] cannot instantiate a class using a button

问题描述

我正在尝试制作一个屏幕截图程序。

I am trying to make a screen capturing program.

我所拥有的是一个透明窗口，它将使用按钮<$来捕获区域c $ c>捕获就可以了，我试图实例化一个 captureScreen 这个 captureScreen 是使用命令提示符单独执行的

What I have is a transparent window, which will give the area to be captured, with a button capture on it, and I am trying to instantiate a class captureScreen that works good when captureScreen is individually executed using a command prompt

我试图在按钮时实例化这个 captureScreen 类点击捕获。

I am trying to instantiate this captureScreen class when button capture is hit.

我试过保留这个类在我的 screenrecord.java 上，将代码放在事件监听器中。在这两种情况下，我都会收到这些错误

I have tried keeping this class on my screenrecord.java, putting the code in event listener also. In both these cases,I get these errors

AWTException,must be caught or declared

in

 Robot robot = new Robot();

和中的IOException> BufferedImage图像行。

保持 captureScreen.java 分开不做任何事。 System.out.println（开始）; 甚至不会打印任何内容。

And keeping the captureScreen.java separate does nothing.System.out.println("Start"); would even not print anything.

这是我的 screenrecord.java 代码

public class screenrecord extends JFrame implements ActionListener{
    public screenrecord() {...
    }
    public void actionPerformed(ActionEvent e){
        if ("record".equals(e.getActionCommand())) {
            captureScreen a = new captureScreen();
            } 
    }   
}

和 captureScreen.java ，单独工作正常。

public class captureScreen extends Object{

    public static void main(String args[]){
        ...
        Robot robot = new Robot();
        BufferedImage image = robot.createScreenCapture(screenRectangle);
        ImageIO.write(image, "png", new File(filename));
        System.out.println("Done");
    }

}

您的所有建议，意见，建议欢迎和赞赏。
请帮我解决这个问题。谢谢。

All your suggestions, comments, advices are welcome and appreciated. Please help me sort this problem. Thanks.

推荐答案

用于编辑 captureScreen.java as，

public class captureScreen extends Object{

    public captureScreen() {
        ....
        filename = ".\\out.png";
        try{Robot robot = new Robot();
             ............ }
        catch(Exception e)  /* Catch Exceptions too  */
        {
            System.out.println("Error"+e);
        }
    }

    public static void main(String args[]){
        new captureScreen();
    }
}

使用main来实例化另一个函数。

Use main to instantiate another function.

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