為組件設置邊框擴展JTextField

Question

我嘗試創建自己的YTextField ，將類擴展到JTextField並且想在FocusListener時設置新的邊框：

這是我的代碼：

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);
    }
}

任何想法如何創建此組件，以便我可以設置例如我的border focusGained嗎？

Answer 1

您可以直接將重點放在獲得的

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

和

setBorder(BorderFactory.createEmptyBorder());

失去重點

祝好運