TextEditor

import javax.swing.*;
import java.io.*;
import java.awt.event.*;
/**
 * TextEditor berguna untuk menulis text, membuka file .txt dan berbagai
 * fungsi lain seperti kegunaan aplikasi notepad
 *
 * @author Daffa Tristan Firdaus
 * @version 14 Januari 2021
 */
public class TextEditor extends JFrame implements ActionListener{
    private JTextArea t;
    private JFrame f;

    TextEditor(){//constructor
        f = new JFrame("Text Editor");
        t = new JTextArea();

        JMenuBar mb = new JMenuBar();

        JMenu m1 = new JMenu("File");
        JMenuItem mi1 = new JMenuItem("New");
        JMenuItem mi2 = new JMenuItem("Open");
        JMenuItem mi3 = new JMenuItem("Save");
        JMenuItem mi4 = new JMenuItem("Print");

        mi1.addActionListener(this);
        mi2.addActionListener(this);
        mi3.addActionListener(this);
        mi4.addActionListener(this);

        m1.add(mi1);
        m1.add(mi2);
        m1.add(mi3);
        m1.add(mi4);

        JMenu m2 = new JMenu("Edit");
        JMenuItem mi5 = new JMenuItem("Cut");
        JMenuItem mi6 = new JMenuItem("Copy");
        JMenuItem mi7 = new JMenuItem("Paste");

        mi5.addActionListener(this);
        mi6.addActionListener(this);
        mi7.addActionListener(this);

        m2.add(mi5);
        m2.add(mi6);
        m2.add(mi7);

        JMenuItem mc = new JMenuItem("Close");

        mc.addActionListener(this);

        mb.add(m1);
        mb.add(m2);
        mb.add(mc);

        f.setJMenuBar(mb);
        f.add(t);
        f.setSize(500,500);
        f.show();
    }

    public void actionPerformed(ActionEvent e){
        String s = e.getActionCommand();
        if(s.equals("Cut")){
            t.cut();
        }else if(s.equals("Copy")){
            t.copy();
        }else if(s.equals("Paste")){
            t.paste();
        }else if(s.equals("Save")){
            JFileChooser j = new JFileChooser("f:");

            int r = j.showSaveDialog(null);

            if(r == JFileChooser.APPROVE_OPTION){
                File fi = new File(j.getSelectedFile().getAbsolutePath());

                try{
                    FileWriter wr = new FileWriter(fi,false);
                    BufferedWriter w = new BufferedWriter(wr);

                    w.write(t.getText());
                    w.flush();
                    w.close();
                }catch(Exception evt){
                    JOptionPane.showMessageDialog(f,evt.getMessage());

                }
            }else{
                JOptionPane.showMessageDialog(f,"the user cancelled the operation");
            }
        }else if(s.equals("Print")){
            try{
                t.print();
            }catch(Exception evt){
                JOptionPane.showMessageDialog(f,evt.getMessage());
            }
        }else if(s.equals("Open")){
            JFileChooser j = new JFileChooser("f:");

            int r = j.showOpenDialog(null);

            if(r == JFileChooser.APPROVE_OPTION){
                File fi = new File(j.getSelectedFile().getAbsolutePath());

                try{
                    String s1 = "", sl = "";

                    FileReader fr = new FileReader(fi);

                    BufferedReader br = new BufferedReader(fr);
                    sl = br.readLine();

                    while((s1 = br.readLine()) != null){
                        sl = sl + "\n" + s1;
                    }

                    t.setText(sl);
                }catch(Exception evt){
                    JOptionPane.showMessageDialog(f,evt.getMessage());
                }
            }else{
                JOptionPane.showMessageDialog(f,"the user cancelled the operation");
            }
        }else if(s.equals("New")){
            t.setText("");
        }else if(s.equals("Close")){
            t.setVisible(false);
        }

    }

    public static void main (String[] args[]){
        TextEditor te = new TextEditor();
    }
}