例子，可以直接執行，應該是你要的

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.border.BevelBorder;

public class LabelTest extends JFrame{

public LabelTest() {

init();

}

private void init() {

setLayout(null);

JLabel l = new JLabel("凹陷的標籤");

l.setBounds(10, 20, 100, 25);

l.setBorder(new BevelBorder(BevelBorder.LOWERED));

add(l);

setSize(150, 100);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

new LabelTest().setVisible(true);

}

}