JSwingExample.java ( Menu & "StatusBar" )

/*

javac JSwingExample.java && jar cfe JSwingExample.jar JSwingExample JSwingExample.class && java -jar JSwingExample.jar

https://docs.oracle.com/javase/8/docs/api/javax/swing/JMenuItem.html

*/

import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

class JSwingExample extends JFrame implements ActionListener {

   JMenuBar jmb;
   JMenu jmF;
   JMenuItem jmiO;
   JMenuItem jmiS;
   JMenuItem jmiQ;
   JMenu jmT;
   JMenuItem jmi1;
   JMenuItem jmi2;
   JMenuItem jmi3;
   //JMenuBar statusBar;
   JPanel statusBar;

   JLabel statusLabel;
   JTextArea ta;
   JTextArea ta2;

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

   JSwingExample(){

      jmb = new JMenuBar();

      jmF = new JMenu("File");
      jmiO = new JMenuItem("Open"); jmiO.addActionListener(this); jmF.add(jmiO);
      jmiS = new JMenuItem("Save"); jmiS.addActionListener(this); jmF.add(jmiS);
      jmiS.setEnabled(false);
      jmF.addSeparator();
      jmiQ = new JMenuItem("Quit"); jmiQ.addActionListener(this); jmF.add(jmiQ);
      jmb.add(jmF);
      jmb.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 0, Color.lightGray));

      jmT = new JMenu("Tools");
      jmi1 = new JMenuItem("1"); jmi1.addActionListener(this); jmT.add(jmi1);
      jmi2 = new JMenuItem("2"); jmi2.addActionListener(this); jmT.add(jmi2);
      jmi3 = new JMenuItem("3"); jmi3.addActionListener(this); jmT.add(jmi3);
      jmb.add(jmT);

      ta=new JTextArea("...\n");
      ta.setLineWrap(true);
      ta.setWrapStyleWord(true);
      ta2=new JTextArea("...\n");
      //ta.setMinimumSize(100);

      JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
      splitPane.setLeftComponent(ta);
      //splitPane.getLeftComponent().setMinimumSize(100);
      splitPane.setRightComponent(ta2);
      splitPane.setOneTouchExpandable(true);
      splitPane.setDividerLocation(150);
      splitPane.setDividerLocation(0.5);

      add(splitPane,BorderLayout.CENTER);

      //statusBar = new JMenuBar();
      statusBar = new JPanel();

      statusLabel=new JLabel("...");
      //statusLabel.setBounds(50,50,100,30);
      statusLabel.setHorizontalAlignment(SwingConstants.LEFT);
      statusLabel.setFont(new Font("sansserif", Font.PLAIN, 11));

      statusBar.setBorder(new BevelBorder(BevelBorder.LOWERED));
      statusBar.setPreferredSize(new Dimension(getWidth(), 20 ));
      statusBar.setLayout(new BoxLayout(statusBar, BoxLayout.X_AXIS));
      statusBar.add(statusLabel);
      add(statusBar,BorderLayout.SOUTH);

      setJMenuBar(jmb);
      setTitle(System.getProperty("user.name"));
      setSize(600,400);
      setLocationRelativeTo(null);
      setVisible(true);
      setDefaultCloseOperation(this.EXIT_ON_CLOSE);
      revalidate();

   }

   public void actionPerformed(ActionEvent e){
      ta.append(e.getSource().toString()+"\n");
      statusLabel.setText(e.getActionCommand());

      if ( e.getActionCommand().equals("Quit") ) { System.exit(0); }

      if ( e.getActionCommand() == "Open" ) {
         jmiS.setEnabled(true);
         JFileChooser fileChooser = new JFileChooser();
         //fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
         fileChooser.setCurrentDirectory(new File(System.getProperty("user.dir")));
         if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
             File selectedFile = fileChooser.getSelectedFile();
             ta.append("Selected file: " + selectedFile.getAbsolutePath());
         }
      }

      //JButton btn = (JButton) e.getSource();
      //String pressedKey = (String) btn.getClientProperty("key");
      /*if (CAPS.equals(pressedKey)) {
        for (JButton button : buttons) {
            String text = button.getText();
            text = caps ? text.toLowerCase() : text.toUpperCase();
            button.setText(text);
        }
        caps = !caps;
        return;
      }*/
      //statusLabel.setText(statusLabel.getText()+" "+pressedKey);

   }

}