JTextArea, JMenuBar, JMenu, JMenuItem not showing up - jframe

Question

I am quite new to Java so I need some help. I am trying to make a Notepad application.
The problem is that none of my menus or textfield is showing up. I cannot figure out what the problem is. Please help.
public class NotePad extends JFrame implements ActionListener {
private JTextArea txtArea;
private JMenuBar mnuBar;
private JMenu mnyFile, mnyFormat, mnyEdit, mnyHelp;
private JMenuItem openFile, saveFile, exit, textWrap, noTextWrap, clear, abtNotepad;
public NotePad() {
setTitle("NOTEPAD");
setSize(700, 500);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new BorderLayout());
//Tekstboks
txtArea = new JTextArea();
//MenyBar
mnuBar = new JMenuBar();
//Meny
mnyFile = new JMenu("File");
mnyFormat = new JMenu("Format");
mnyEdit = new JMenu("Edit");
mnyHelp = new JMenu("Help");
//UnderMeny
openFile = new JMenuItem("Open");
saveFile = new JMenuItem("Save");
exit = new JMenuItem("Exit");
textWrap = new JMenuItem("Text Wrap");
noTextWrap = new JMenuItem("No Text Wrap");
clear = new JMenuItem("Clear");
abtNotepad = new JMenuItem("About Notepad");
add(txtArea);
add(mnuBar);
add(mnyFile);
add(mnyFormat);
add(mnyEdit);
add(mnyHelp);
add(openFile);
add(saveFile);
add(exit);
add(textWrap);
add(noTextWrap);
add(clear);
add(abtNotepad);
setJMenuBar(mnuBar);
setVisible(true);
}
public static void main(String[] args) {
new NotePad();
}
public void actionPerformed(ActionEvent e) {
}
}

Answer 1

Your constructor should look something like:
public NotePad() {
setTitle("NOTEPAD");
setSize(700, 500);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new FlowLayout());
txtArea = new JTextArea();
mnuBar = new JMenuBar();
mnyFile = new JMenu("File");
mnyFormat = new JMenu("Format");
mnyEdit = new JMenu("Edit");
mnyHelp = new JMenu("Help");
openFile = new JMenuItem("Open");
saveFile = new JMenuItem("Save");
exit = new JMenuItem("Exit");
textWrap = new JMenuItem("Text Wrap");
noTextWrap = new JMenuItem("No Text Wrap");
clear = new JMenuItem("Clear");
abtNotepad = new JMenuItem("About Notepad");
mnuBar.add(mnyFile);
mnuBar.add(mnyFormat);
mnuBar.add(mnyEdit);
mnuBar.add(mnyHelp);
mnyFile.add(openFile);
mnyFile.add(saveFile);
mnyFile.add(exit);
mnyFormat.add(textWrap);
mnyFormat.add(noTextWrap);
mnyEdit.add(clear);
mnyHelp.add(abtNotepad);
setJMenuBar(mnuBar);
add(txtArea);
setVisible(true);
}
Otherwise you are overriding each component you add to BorderLayout.