Java by API/javax.swing.border/LineBorder

LineBorder: createBlackLineBorder()

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
public class MainClass {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("Line Borders");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Border thinBorder = LineBorder.createBlackLineBorder();
    
    JButton thinButton = new JButton("1 Pixel");
    thinButton.setBorder(thinBorder);
    
    Container contentPane = frame.getContentPane();
    contentPane.add(thinButton, BorderLayout.NORTH);
    frame.pack();
    frame.setSize(300, frame.getHeight());
    frame.setVisible(true);
  }
}

LineBorder: createGrayLineBorder()

import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

new LineBorder(Color color, int thickness)

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
public class MainClass {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("Line Borders");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Border thickBorder = new LineBorder(Color.WHITE, 12);
    
    JButton thickButton = new JButton("12 Pixel");
    thickButton.setBorder(thickBorder);
    
    Container contentPane = frame.getContentPane();
    contentPane.add(thickButton, BorderLayout.NORTH);
    frame.pack();
    frame.setSize(300, frame.getHeight());
    frame.setVisible(true);
  }
}

new LineBorder(Color color, int thickness, boolean roundedCorners)

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
public class MainClass {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("Line Borders");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Border roundedBorder = new LineBorder(Color.BLACK, 12, true);
    
    JButton roundedButton = new JButton("Rounded 12 Pixel");
    roundedButton.setBorder(roundedBorder);
    
    Container contentPane = frame.getContentPane();
    contentPane.add(roundedButton, BorderLayout.SOUTH);
    frame.pack();
    frame.setSize(300, frame.getHeight());
    frame.setVisible(true);
  }
}