Java Swing on high-DPI screen

Question

I have a Java Swing program that uses the System Look And Feel:

UIManager.setLookAndFeel (UIManager.getSystemLookAndFeelClassName ());

The

Answer 1

You could physically modify the look and feel's font settings...

import java.awt.EventQueue;
import java.awt.Font;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                setDefaultSize(24);

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JLabel("Happy as a pig in a blanket"));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public static void setDefaultSize(int size) {

        Set