为组件设置边框扩展JTextField

Question

我尝试创建自己的YTextField ，将类扩展到JTextField并且想在FocusListener时设置新的边框：

这是我的代码：

public class YTextField extends JTextField {

    public YTextField() {
        super();
        super.setFont(new java.awt.Font("SansSerif", 0, 14));
        FocusListener highlighter = new FocusListener() {

            @Override
            public void focusGained(FocusEvent e) {
                //Set my border
                Border border = BorderFactory.createLineBorder(Color.red);
                super.setBorder(UIManager.getBorder(border));
            }

            @Override
            public void focusLost(FocusEvent e) {
                //Set the default border
                super.setBorder(UIManager.getBorder("TextField.border"));

            }
        };
        super.addFocusListener(highlighter);
    }
}

任何想法如何创建此组件，以便我可以设置例如我的border focusGained吗？

Answer 1

您可以直接将重点放在获得的

setBorder(BorderFactory.createLineBorder(Color.red)); 

和

setBorder(BorderFactory.createEmptyBorder());

失去重点

祝好运