JTextField要想實現邊框美化 就必須重寫方法，下面是我自己用的一個邊框工具類（你也可以自己修改）。程式碼如下：

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.border.LineBorder;

/**
 * @author user 
 *   邊框設定   
 */

public class TextBorderUtlis
 
 extends LineBorder 
{

    private static final long serialVersionUID = 1L;

    public TextBorderUtlis(Color color, int thickness, boolean roundedCorners) 
    {
        super(color, thickness, roundedCorners);
    }

    public void paintBorder(Component c, Graphics g, int x, int y, int width, int
 
 height) 
    {

        RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Color oldColor = g.getColor();
        Graphics2D g2 = (Graphics2D) g;
        int i;
        g2.setRenderingHints(rh);
        g2.setColor(lineColor);
        for
 
 (i = 0; i < thickness; i++) 
        {
            if (!roundedCorners){
                g2.drawRect(x + i, y + i, width - i - i - 1, height - i - i - 1);
            }else{
                g2.drawRoundRect(x + i, y + i, width - i - i - 1, height - i - i - 1, 5, 5);}
        }
        g2.setColor(oldColor);
    }

}

然後你們可以直接呼叫這個，如圖：