java - 我如何在事件中获取变量？ [英] java - how do i acess varibles in a event?

问题描述

这是我的代码

this is my code

final URL url = new URL("http://minecraft.aggenkeech.com/face.php?u=z3nox");
		image1 = new ImageIcon(ImageIO.read(url)); 
		FaceImage = new JLabel(image1);
		FaceImage.setHorizontalAlignment(SwingConstants.LEFT);
		FaceImage.setVerticalAlignment(SwingConstants.TOP);
		FaceImage.setBounds(550, 11, 65, 60);
		contentPane.add(FaceImage);

UserNameTextField = new JTextField();
		UserNameTextField.addKeyListener(new KeyAdapter() {
			@Override
			public void keyPressed(KeyEvent arg0) {
				if(arg0.getKeyCode() == KeyEvent.VK_ENTER){
					// search
					final URL url = new URL("http://minecraft.aggenkeech.com/face.php?u=hghg32");
					image1 = new ImageIcon(ImageIO.read(url)); 
				}
			}
		});
		UserNameTextField.setHorizontalAlignment(SwingConstants.CENTER);
		UserNameTextField.setBorder(BorderFactory.createLineBorder(Color.black));
		UserNameTextField.addInputMethodListener(new InputMethodListener() {
			public void caretPositionChanged(InputMethodEvent arg0) {
			}
			public void inputMethodTextChanged(InputMethodEvent arg0) {
				UserNameTextField.setBackground(Color.red);
			}
		});
		UserNameTextField.setBounds(557, 326, 124, 20);
		contentPane.add(UserNameTextField);
		UserNameTextField.setColumns(10);

问题在

the problem is at

public void keyPressed(KeyEvent arg0) {
        if(arg0.getKeyCode() == KeyEvent.VK_ENTER){
            // search
            final URL url = new URL("http://minecraft.aggenkeech.com/face.php?u=hghg32");
            image1 = new ImageIcon(ImageIO.read(url));
        }
    }
});

当我按下输入图像时我想要改变，但我在该行上得到2个错误的网址

它要我tey / catch但是我尝试了但它不起作用？有人可以帮帮我吗？如何访问url varible？

I want when I press enter for the image to change but I get 2 errors on that line with the url
it wants me to "tey/catch" but I try that but it dosen't work? can some one please help me? how do I access the url varible?

推荐答案

你需要用try / catch包围相关的行：

You need to surround the lines in question with try/catch:

public void keyPressed(KeyEvent arg0) {
  if(arg0.getKeyCode() == KeyEvent.VK_ENTER) { // search
    try {
      final URL url = new URL("http://minecraft.aggenkeech.com/face.php?u=hghg32");
      image1 = new ImageIcon(ImageIO.read(url));
    }
    catch(IOException e) {
      //TODO do something here...
      e.printStackTrace();
    }
  }
}

如上所述，URL不一定是最终的，你没有在任何地方定义image1，但我认为你知道如何处理它。你的catch块应该有更多有用的代码，并做一些事情来优雅地退出逻辑流。

As written, URL does not need to be final, and you haven't defined image1 anywhere but I assume that you know what to do with it. Your catch block should have more useful code in it and do something to gracefully quit the logic stream.

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