hello/java/samples/java-packages/source/DemoJFrame.java

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package gui;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 *
 * @author (C)Y.D.Zakovryashin, 28.11.2022
 */
public class DemoJFrame extends JFrame {

    private JLabel lbl;

    public DemoJFrame(String title) {
        super(title);
//        setBounds (x, y, w, h);
//        setTitle (title);
        setLocation(120, 80);
        setSize(640, 480);
        setResizable(false);
        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
        init();
        setVisible(true);
    }

    public static void main(String[] args) {
        DemoJFrame demo = new DemoJFrame("Demo JFrame");
    }

    private void init() {
//        DemoWindowListener wl = new DemoWindowListener();
//        addWindowListener(wl);
        addWindowListener(new DemoWindowAdapter());
        Container cp = getContentPane();
        cp.setLayout(null);
        //        cp.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 5));
        lbl = new JLabel("Demo label");
        lbl.setBounds(120, 80, 160, 32);
        JButton b = new JButton("Demo button");
        b.setBounds(120, 140, 160, 32);
        b.addActionListener(new DemoActionListener(cp));
        // class ? implements ActionListener { .... }
        b.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String s = lbl.getText();
                lbl.setText(s + "*");
            }
        });
        cp.add(lbl);
        cp.add(b);
    }
}