leaning java swing 为组件设置边框

import javax.swing.*;

import javax.swing.border.BevelBorder;

import javax.swing.border.Border;

import java.awt.*;

public class BorderTest {

    private JFrame jf = new JFrame("test border");

    public void init(){

        jf.setLayout(new GridLayout(,));

        Border bb = BorderFactory.createBevelBorder(BevelBorder.RAISED, Color.RED, Color.GREEN,Color.BLUE, Color.GRAY);

        jf.add(getPanelWithBorder(bb, "BevelBorder"));

        jf.pack();

        jf.setVisible(true);

    }

    public static void main(String[] args) {

        new BorderTest().init();

    }

    public  JPanel getPanelWithBorder(Border b, String BorderName) {

        var p = new JPanel();

        p.add(new Label(BorderName));

        p.setBorder(b);

        return  p;

    }

}

output: